200-901 Practice Test 4 — 10 Questions

Question 1

A developer is writing a Python script using the Cisco Webex Teams API to send a message to a specific room. The script works for some rooms but fails for others with a 404 error. What is the most likely reason?

Accepted Answer

The bot is not a member of those rooms.. The 404 error indicates that the resource (the room) was not found by the API. In the Cisco Webex Teams API, a bot can only interact with rooms it has been added to as a member. If the bot is not a member of a room, the API cannot locate the room from the bot's perspective, resulting in a 404 error. This is the most common cause of intermittent 404 errors when the script works for some rooms but not others.

Answer

The API rate limit has been exceeded for those rooms.

Answer

The access token is invalid for those rooms.

Answer

The bot does not have permission to send messages in those rooms.

Question 2

A developer is designing a REST API that will be used by multiple client applications. The API must support versioning to ensure backward compatibility. Which approach should the developer use to implement API versioning?

Accepted Answer

Embed the version in the URI, e.g., /v1/resource. Embedding the version in the URI (e.g., /v1/resource) is the most common and straightforward approach for REST API versioning. It makes the version explicit in the URL, allowing clients to directly target a specific version without requiring special header handling or query parameter parsing. This method is widely adopted in industry APIs (e.g., GitHub, Twilio) and ensures backward compatibility by keeping older endpoints accessible under their original URI path.

Answer

Use different HTTP methods for different versions

Answer

Pass the version as a query parameter, e.g., ?version=1

Answer

Use a custom HTTP header to specify the version

Question 3

A developer is working with a REST API that uses HTTP Basic Authentication. The developer needs to send a request with the username 'admin' and password 'secret'. Which HTTP header should be set?

Accepted Answer

Authorization: Basic YWRtaW46c2VjcmV0. HTTP Basic Authentication requires the credentials to be formatted as 'username:password', then Base64-encoded, and sent in the Authorization header with the 'Basic' scheme. Option C correctly includes the 'Basic' scheme followed by the Base64-encoded string 'YWRtaW46c2VjcmV0' (which decodes to 'admin:secret').

Answer

Authorization: Basic admin:secret

Answer

Authorization: YWRtaW46c2VjcmV0

Answer

Authorization: Bearer YWRtaW46c2VjcmV0

Question 4

A developer is writing a Python script that uses the Cisco Catalyst Center (formerly DNA Center) API to get the list of sites. The API returns a response with a 'response' key containing a list of sites. The developer wants to access the 'response' field from the JSON response. Which code snippet correctly extracts the list?

Accepted Answer

sites = response['response']. Option B is correct because the Cisco Catalyst Center API returns a JSON response where the list of sites is nested under the 'response' key. Using dictionary-style indexing with `response['response']` directly retrieves that list, which is the standard way to access a known key in a Python dictionary parsed from JSON.

Answer

sites = list(response)

Answer

sites = response[0]

Answer

sites = response.get('response')

Question 5

A network automation engineer is using Ansible to manage Cisco IOS devices. The playbook includes a task that executes a 'show version' command and registers the output. The engineer then wants to parse the output to extract the IOS version. Which approach should be used?

Accepted Answer

Use the 'cisco.ios.ios_facts' module to get structured facts. The 'cisco.ios.ios_facts' module retrieves structured data from Cisco IOS devices, including the IOS version as a key-value pair in the Ansible facts dictionary. This eliminates the need for manual parsing, as the module uses the device's CLI or NETCONF to gather structured output, making it the most efficient and reliable approach for extracting specific device attributes.

Answer

Use the 'cisco.ios.ios_command' module and parse the output with regex

Answer

Use the 'cisco.ios.ios_command' module and the 'parse' option

Answer

Use the 'cisco.ios.ios_config' module to retrieve the version

Question 6

A Python script uses the Cisco Meraki API to fetch the list of organizations. The script fails with a 401 HTTP status. What is the most likely cause?

Accepted Answer

The API key is invalid or missing.. A 401 HTTP status indicates 'Unauthorized', which in the context of the Meraki API means the request lacks valid authentication credentials. The most common cause is an invalid or missing API key, as the Meraki API requires a valid API key in the `X-Cisco-Meraki-API-Key` header for all requests.

Answer

The API request exceeded the rate limit.

Answer

The API key does not have permission to list organizations.

Answer

The API endpoint URL is incorrect.

Question 7

A DevOps team is using Cisco NSO to manage network devices. They want to ensure that the configuration is compliant with corporate standards. Which NSO feature should they use?

Accepted Answer

Service reconciliation using FastMap. Service reconciliation using FastMap is the correct NSO feature for ensuring configuration compliance with corporate standards because it detects and corrects deviations between the intended service model (defined in YANG) and the actual device configuration. FastMap performs a diff and re-applies the service logic to bring the device back into compliance, making it ideal for continuous compliance enforcement.

Answer

Configuration Snapshots

Answer

NETCONF notifications

Answer

Configuration Database (CDB) rollback

Question 8

A developer is building a chatbot that retrieves interface status from a Cisco Catalyst 9000 switch using RESTCONF. Which authentication method is most appropriate for programmatic access?

Accepted Answer

HTTP Basic Authentication over HTTPS.. RESTCONF on Cisco Catalyst 9000 switches supports HTTP Basic Authentication over HTTPS as a straightforward, standards-based method for programmatic access. Basic authentication sends the username and password in the HTTP Authorization header, and when combined with HTTPS, the credentials are encrypted in transit, providing adequate security for device management without requiring additional infrastructure like an OAuth provider or certificate authority.

Answer

API key passed in the HTTP header.

Answer

OAuth 2.0 with client credentials grant.

Answer

Client certificate authentication.

Question 9

A network administrator uses the Cisco IOS XE CLI to configure a router. They want to use a Python script to automate this configuration via the guest shell. Which library should they use to interact with the CLI from within the guest shell?

Accepted Answer

cli. The `cli` library is a built-in Python module available within the Cisco Guest Shell that allows scripts to execute IOS XE CLI commands directly on the host device. This library provides functions like `cli.execute()` and `cli.configure()` to send commands and retrieve output, making it the correct choice for automating configuration via the Guest Shell without external dependencies.

Answer

requests

Answer

ncclient

Answer

paramiko

Question 10

A network engineer needs to automate the configuration of VLANs across 50 switches. Which approach best follows Cisco’s recommended practices for programmability?

Accepted Answer

Write an Ansible playbook using the ios_vlan module to configure VLANs on all switches.. Option A is correct because Ansible's ios_vlan module is purpose-built for automating VLAN configuration on Cisco IOS devices, aligning with Cisco's recommended practices for programmability by using a declarative, agentless automation tool that abstracts the underlying CLI and ensures idempotent configuration across multiple switches.

Answer

Use a REST API on each switch to push the VLAN configuration individually.

Answer

Use a Python script that manually SSHes into each switch and applies CLI commands.

Answer

Configure all VLANs via SNMP MIBs.