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← Software Development and Design practice sets

200-901 Software Development and Design • Complete Question Bank

200-901 Software Development and Design — All Questions With Answers

Complete 200-901 Software Development and Design question bank — all 0 questions with answers and detailed explanations.

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Certifications/200-901/Practice Test/Software Development and Design/All Questions
Question 1easymultiple choice
Read the full NAT/PAT explanation →

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?

Question 2mediummultiple choice
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A development team is implementing a microservices architecture. They need to ensure that services can discover each other dynamically without hardcoding IP addresses. Which technology should they use?

Question 3hardmultiple choice
Study the full Python automation breakdown →

A developer is writing a Python script that uses the Cisco Meraki API to retrieve a list of networks for an organization. The API returns a JSON array. The developer wants to filter networks where the 'tags' field contains 'production'. Which code snippet correctly filters the results?

Question 4easymultiple choice
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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?

Question 5mediummultiple choice
Read the full Ansible explanation →

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?

Question 6hardmultiple choice
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A developer is using the Cisco Webex API to create a room and add members. The API requires an access token with the appropriate scopes. The developer receives a 401 Unauthorized error when trying to create a room. What is the most likely cause?

Question 7easymultiple choice
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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?

Question 8mediummultiple choice
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A developer is using Git for source control. They have made changes to a file and want to temporarily save the changes without committing, then work on a different branch. Which Git command should they use?

Question 9mediummulti select
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Which TWO statements about REST API design best practices are true? (Choose two.)

Question 10hardmulti select
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Which THREE of the following are common design patterns for microservices? (Choose three.)

Question 11easymultiple choice
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Which HTTP method is considered both safe and idempotent?

Question 12hardmultiple choice
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A large enterprise is migrating to a DevOps model and needs to automate the provisioning of network devices. The team has chosen Ansible for configuration management and is using a Git repository for version control. The network includes Cisco IOS routers, Catalyst switches running IOS-XE, and ASA firewalls. The team has written Ansible playbooks for each device type. The goal is to have a CI/CD pipeline that automatically deploys configuration changes to the production network after the changes are merged into the main branch. However, during a recent deployment, a misconfiguration was pushed to a core router, causing a 10-minute outage. The root cause was that the playbook that was executed was not the correct one for that device model. The team wants to implement a mechanism to prevent similar incidents. Which approach should the team adopt?

Question 13mediummultiple choice
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A network engineer is developing a Python script to automate the collection of interface statistics from multiple Cisco Catalyst switches using NETCONF. The engineer uses the 'ncclient' library to connect to each switch. The script works for most switches, but for one switch, the connection consistently fails with an authentication error. The engineer has verified that the username and password are correct and that the switch has NETCONF enabled. The engineer suspects the issue might be related to SSH host key checking. The engineer wants to modify the script to bypass host key checking for this specific switch. Which approach should the engineer use?

Question 14mediummultiple choice
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A company uses a CI/CD pipeline to deploy network configurations. The pipeline includes a stage that runs automated tests against a simulated network environment. Which testing strategy does this represent?

Question 15hardmulti select
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Which TWO statements about REST API design best practices are correct?

Question 16easymultiple choice
Read the full REST/YANG explanation →

Refer to the exhibit. An engineer uses NETCONF to configure an interface. After applying this configuration, the interface is administratively up. However, the interface does not pass traffic. What is the most likely cause?

Exhibit

Refer to the exhibit.

{
  "ietf-interfaces:interface": {
    "name": "GigabitEthernet0/1",
    "description": "Configured via NETCONF",
    "type": "iana-if-type:ethernetCsmacd",
    "enabled": true,
    "ietf-ip:ipv4": {
      "address": [
        {
          "ip": "192.0.2.1",
          "netmask": "255.255.255.0"
        }
      ]
    }
  }
}
Question 17mediumdrag order
Review the full routing breakdown →

Drag and drop the steps to configure a static route on a Cisco IOS router into the correct order.

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
Question 18mediumdrag order
Study the full Python automation breakdown →

Drag and drop the steps to deploy a Python script to a Cisco device via RESTCONF into the correct order.

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
Question 19mediummatching
Read the full Software Development and Design explanation →

Match each Cisco DevNet Associate exam topic to its description.

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

Concepts
Matches

Covers version control, testing, and CI/CD pipelines

Focuses on REST APIs, authentication, and API consumption

Includes configuration management, infrastructure as code, and network automation

Covers OSI model, TCP/IP, routing, switching, and network topologies

Involves containerization, cloud deployment, and security best practices

Question 20mediummatching
Read the full Software Development and Design explanation →

Match each HTTP status code to its meaning.

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

Concepts
Matches

OK

Created

Unauthorized

Forbidden

Not Found

Question 21mediummultiple choice
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A Python script using the requests library to query the Cisco Meraki API returns a 403 Forbidden error. The API key is correctly set in the header. What is the most likely cause?

Question 22mediummultiple choice
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A network automation team uses a CI/CD pipeline. Which practice best ensures that configuration changes are validated before deployment to production?

Question 23easymultiple choice
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A Python script used for network automation requires storing an API secret. Which approach is the most secure and recommended best practice?

Question 24easymultiple choice
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A team uses GitHub for version control and wants Jenkins to automatically run tests when changes are pushed to the main branch. Which trigger should be configured in the Jenkins job?

Question 25mediummultiple choice
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A Python script uses the `requests` library to fetch device details from Cisco DNA Center. The API returns a JSON response with nested objects. To extract the management IP address from the response stored in variable `data`, which code snippet is correct? The JSON structure is:

{
  "response": [
    {
      "managementIpAddress": "192.168.1.1",
      "hostname": "router1"
    }
  ]
}
Question 26mediummultiple choice
Read the full Ansible explanation →

An Ansible playbook fails with the error: "mapping values are not allowed here". The relevant YAML snippet is: --- - name: Configure interface ios_config: lines: - ip address 10.0.0.1 255.255.255.0 parents: interface GigabitEthernet0/1 What is the most likely cause of this error?

Question 27easymultiple choice
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The exhibit shows a JSON response from a Cisco NX-OS API query for interface status. What is the operational state of interface Ethernet1/1?

Exhibit

Refer to the exhibit.
{
  "result": {
    "interfaces": [
      {
        "if-name": "Ethernet1/1",
        "admin-state": "up",
        "oper-state": "down"
      }
    ]
  }
}
Question 28mediummultiple choice
Open the full VLAN trunking answer →

A network engineer runs the Ansible playbook shown in the exhibit, but it fails. The error indicates the module 'cisco.ios.ios_vlan' does not exist. What is the most likely cause?

Exhibit

Refer to the exhibit.
---
- name: Configure VLAN
  cisco.ios.ios_vlan:
    vlan_id: 100
    name: test_vlan
    state: present
  register: result
Question 29hardmultiple choice
Study the full Python automation breakdown →

A Python script using ncclient to configure a Cisco IOS XE device fails with an error that the capability 'urn:ietf:params:xml:ns:netconf:base:1.0' is missing. What is the most likely cause?

Exhibit

Refer to the exhibit.
from ncclient import manager

with manager.connect(
    host="10.0.0.1",
    port=830,
    username="admin",
    password="secret",
    hostkey_verify=False
) as m:
    config = '''
    <config>
      <native xmlns="http://cisco.com/ns/yang/Cisco-IOS-XE-native">
        <hostname>NewRouter</hostname>
      </native>
    </config>'''
    m.edit_config(target="running", config=config)
Question 30easymulti select
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Which TWO of the following are essential steps in a typical Git workflow when collaborating on a feature branch? (Choose two.)

Question 31mediummulti select
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Which THREE of the following are key characteristics of a RESTful API? (Choose three.)

Question 32mediummulti select
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Which THREE of the following are common tools used in a CI/CD pipeline for network automation? (Choose three.)

Question 33hardmultiple choice
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A developer is troubleshooting a CI/CD pipeline that automatically deploys configuration changes to network devices. The pipeline includes a stage that runs Python unit tests. Which of the following would be a valid test to include in that stage to validate the configuration before deployment?

Question 34hardmultiple choice
Read the full VPN explanation →

A network engineer is designing a REST API using Python Flask to allow provisioning of VPN tunnels. The API must support multiple clients and must be secure. Which approach is most appropriate for authenticating and authorizing API requests?

Question 35hardmultiple choice
Read the full Ansible explanation →

A CI/CD pipeline for network automation includes a stage that runs Ansible playbooks against a staging environment. The pipeline is triggered by Git commits. After a commit, the pipeline fails because the Ansible inventory file is missing. What is the most likely reason?

Question 36easymultiple choice
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A developer is designing a REST API for a network automation tool. Which HTTP method should be used to retrieve the current configuration of a network device?

Question 37mediummultiple choice
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A team is using Git for version control. A developer accidentally committed a sensitive file. Which Git command should be used to remove the file from the repository history while keeping it locally?

Question 38hardmultiple choice
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In a microservices architecture, a REST API must support idempotent updates. Which HTTP method and design practice should be used?

Question 39easymultiple choice
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Which data serialization format is most commonly used for configuration files in Cisco automation tools like Ansible?

Question 40mediummultiple choice
Study the full Python automation breakdown →

A developer is writing a Python script to interact with a Cisco device using NETCONF. Which library is most appropriate?

Question 41hardmultiple choice
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In a CI/CD pipeline, a code quality check fails due to a security vulnerability in a third-party library. What is the best practice to address this?

Question 42easymultiple choice
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Which design principle suggests that a module should be responsible for a single part of the functionality?

Question 43mediummultiple choice
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A REST API returns a 500 Internal Server Error when a client sends a malformed JSON payload. What is the most appropriate HTTP response code to indicate a client-side error?

Question 44hardmultiple choice
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During a code review, a developer notices that a function has multiple nested if-else statements. Which refactoring technique would improve maintainability?

Question 45easymulti select
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Which TWO HTTP methods are considered safe according to HTTP/1.1 specification?

Question 46mediummulti select
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Which THREE of the following are direct benefits of using version control in software development?

Question 47hardmulti select
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Which THREE of the following are constraints of the REST architectural style (as defined by Roy Fielding)?

Question 48easymultiple choice
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Refer to the exhibit. A developer is trying to access the REST API on a Cisco IOS XE device but receives a 401 Unauthorized error. What is the most likely cause?

Exhibit

ip http server
ip http secure-server
ip http authentication local
Question 49mediummultiple choice
Read the full Ansible explanation →

Refer to the exhibit. What will be the result of running this Ansible playbook against the 'switches' group?

Exhibit

---
- name: Configure VLAN
  hosts: switches
  tasks:
    - name: Create VLAN 10
      cisco.ios.ios_vlan:
        vlan_id: 10
        name: voice
        state: present
Question 50hardmultiple choice
Study the full Python automation breakdown →

Refer to the exhibit. A developer executes this Python script against a Cisco device. Assuming valid credentials and network connectivity, what is printed to the console?

Exhibit

from ncclient import manager
import xml.dom.minidom
with manager.connect(host='192.168.1.1', port=830, username='admin', password='cisco', hostkey_verify=False) as m:
    c = m.get_config(source='running')
    print(xml.dom.minidom.parseString(c.xml).toprettyxml())
Question 51easymultiple choice
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A developer is writing a Python script to interact with the Cisco DNA Center REST API. Which HTTP method should be used to retrieve a list of network devices?

Question 52easymultiple choice
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When designing a RESTful API for a network automation tool, which status code indicates that a resource has been created successfully?

Question 53mediummultiple choice
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A network engineer is developing a Python application that uses the Cisco Meraki Dashboard API. The API responses are in JSON format. Which Python module is most commonly used to parse JSON responses?

Question 54mediummultiple choice
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A developer is implementing error handling in a script that makes multiple API calls to Cisco ACI. Which approach is best practice for handling transient network failures?

Question 55hardmultiple choice
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In a CI/CD pipeline for a network automation project, which stage is responsible for validating the syntax of YAML configuration files?

Question 56hardmultiple choice
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A developer is using Git for version control of a Python library. A colleague accidentally committed a large sensitive file. Which Git command sequence should be used to remove the file from history without losing subsequent changes?

Question 57easymultiple choice
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When designing a REST API endpoint to update a network device's configuration, which HTTP method should be used?

Question 58mediummultiple choice
Study the full Python automation breakdown →

A developer is designing a Python script that uses the NSO (Network Services Orchestrator) northbound API. Which data format is natively supported by NSO's RESTCONF API?

Question 59hardmultiple choice
Read the full NAT/PAT explanation →

In the context of microservices for network automation, which pattern ensures that each service has a separate database to avoid tight coupling?

Question 60mediummulti select
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Which TWO of the following are commonly used HTTP methods for a RESTful API to retrieve and update a resource? (Select TWO)

Question 61hardmulti select
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Which TWO of the following Git commands modify the commit history? (Select TWO)

Question 62easymulti select
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Which THREE of the following are common stages in a continuous integration pipeline? (Select THREE)

Question 63mediummultiple choice
Read the full Ansible explanation →

Refer to the exhibit. A developer is writing an Ansible playbook to configure this interface on a Cisco IOS XE device. Which Ansible module should be used to set the IP address?

Exhibit

interface GigabitEthernet0/0
 description Uplink to Core
 ip address 192.168.1.1 255.255.255.0
 no shutdown
Question 64hardmultiple choice
Study the full Python automation breakdown →

Refer to the exhibit. This JSON response was received from the Cisco DNA Center API. A developer wants to extract the software version of the first device. Which Python expression correctly retrieves '16.12.5' from the variable `data`?

Exhibit

{
  "response": [
    {
      "id": "1234",
      "name": "Switch1",
      "platformId": "C9300-24P",
      "softwareVersion": "16.12.5",
      "upTime": "30 days, 4 hours, 12 minutes"
    }
  ],
  "version": "1.0"
}
Question 65easymultiple choice
Study the full Python automation breakdown →

Refer to the exhibit. A developer is parsing the output of 'show ip route' using Python. Which regular expression would extract the prefix '10.0.1.0/24'?

Exhibit

R1# show ip route
Codes: L - local, C - connected, S - static, R - RIP, O - OSPF, B - BGP
       D - EIGRP, EX - EIGRP external, N - NAPT
Gateway of last resort is 10.0.0.1
     10.0.0.0/8 is variably subnetted, 2 subnets
C       10.0.0.0/24 is directly connected, GigabitEthernet0/0
S       10.0.1.0/24 [1/0] via 10.0.0.2
Question 66easymultiple choice
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A developer is writing a Python script to interact with a Cisco device using RESTCONF. The script sends a PUT request to modify an interface configuration. Which HTTP response code indicates that the resource was successfully created?

Question 67hardmultiple choice
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A team uses Git for source control. They want to ensure that all code committed to the main branch passes unit tests and linting. Which Git workflow practice best ensures this?

Question 68hardmultiple choice
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In a Python application that uses the ncclient library to manage Cisco devices via NETCONF, the developer encounters an error: 'ncclient.transport.errors.SessionCloseError: session closed on error'. Which of the following is the most likely cause?

Question 69easymultiple choice
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Which of the following best describes the purpose of a unit test in software development?

Question 70mediummultiple choice
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A developer is designing a REST API for managing network devices. The API should support idempotent operations for updating device configuration. Which HTTP method should be used for the update operation?

Question 71hardmultiple choice
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A Python script uses the requests library to authenticate to Cisco DNA Center. The script receives a 401 Unauthorized error even though the credentials are correct. Which of the following is a likely cause?

Question 72mediummultiple choice
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Which of the following is a best practice for version controlling large binary files (e.g., network device firmware images) in a Git repository?

Question 73easymultiple choice
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In Python, which keyword is used to define a function that does not return any value?

Question 74easymulti select
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Which TWO of the following are true about REST API design principles?

Question 75mediummulti select
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Which THREE of the following are common steps in a CI/CD pipeline for a Python application that manages Cisco devices?

Question 76hardmulti select
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Which TWO of the following are valid ways to handle errors in a Python program that uses the Cisco Meraki API?

Question 77mediummultiple choice
Open the full VLAN trunking answer →

A junior network developer is tasked with writing a Python script that uses the Cisco NX-API to retrieve the current VLAN configuration from a Nexus switch. The script should output the VLAN IDs in a JSON format. The developer wrote the following code:

import requests
import json

url = "https://192.168.1.1/api/aaaLogin.json" payload = {"aaaUser":{"attributes":{"name":"admin","pwd":"cisco123"}}} r = requests.post(url, json=payload, verify=False) token = r.json()["imdata"][0]["aaaLogin"]["attributes"]["token"]

After authentication, the developer attempts to get VLANs using a GET request to "https://192.168.1.1/api/mo/sys/vlan.json" but receives a 401 error. Which of the following should the developer do to fix the issue?

Question 78hardmultiple choice
Read the full Ansible explanation →

A network automation team uses Ansible to manage Cisco ACI fabrics. They have a playbook that creates application profiles using the 'aci_ap' module. Recently, they started using a new Python script that directly uses the Cisco ACI REST API to perform the same tasks. The script often fails with a 403 Forbidden error, although the Ansible playbook works fine. The authentication method is the same: basic authentication over HTTPS. The API user has the same privileges. Which of the following is the most likely cause?

Question 79mediummultiple choice
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A developer is working on a Python application that automates the configuration of multiple Cisco IOS-XE devices using RESTCONF. The application uses the requests library. The developer notices that sometimes the PUT request to update the interface description returns a 409 Conflict error. Upon investigation, the developer finds that the issue occurs when two instances of the application are running concurrently and attempt to update the same interface. The developer wants to implement a strategy to avoid conflicts. Which approach is most effective?

Question 80mediummultiple choice
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A developer is designing a Python script to parse the output of 'show ip interface brief' from a Cisco IOS device. The output is stored in a string variable. The developer wants to extract only the interfaces that are up/up. The current code uses regular expressions but often fails because the interface names contain special characters (e.g., GigabitEthernet1/0/1). Which approach should the developer use to reliably parse the output?

Question 81mediummulti select
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A developer is designing a REST API for managing network devices. Which three best practices should be followed for the API design? (Choose three.)

Question 82easymultiple choice
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A network automation engineer is writing a Python script to interact with the Cisco Meraki Dashboard API. The script currently makes GET requests to retrieve a list of networks and then makes subsequent requests for each network to get device details. However, the script is slow due to network latency. The engineer wants to improve performance without changing the API's functionality. Which approach best addresses the performance issue?

Question 83hardmultiple choice
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A DevOps team is developing a CI/CD pipeline for a microservices application that uses Cisco NSO (Network Services Orchestrator) for network configuration. The application code is stored in a Git repository. The pipeline must automatically trigger a test suite when a pull request is merged to the main branch, but only if the tests pass, then deploy to a staging environment. The team is using Jenkins. A junior engineer suggests using a single Jenkinsfile with a declarative pipeline that includes all stages. However, a senior engineer notes that the pipeline should be designed for reusability and maintainability, especially as the number of microservices grows. Which approach best meets these requirements?

Question 84easymulti select
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Which TWO conditions are valid triggers for a webhook notification in Cisco Meraki?

Question 85hardmultiple choice
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A network engineer is automating the deployment of new branch offices using Cisco DNA Center REST API. The script creates a new site under a parent site using the POST /dna/intent/api/v1/site API endpoint. The script runs successfully but when checking the DNA Center UI, the new site appears under the incorrect parent site. The script uses the following JSON payload:

{
  "parentId": "0a1b2c3d-4e5f-6789-0ab1-2c3d4e5f6789",
  "name": "Branch-Office-42",
  "type": "area",
  "latitude": 34.0522,
  "longitude": -118.2437
}

The parentId is obtained from a GET request to /dna/intent/api/v1/site that returns a list of all sites. The engineer verified that the parentId matches the UUID of a site named 'HQ', which the engineer believes is an area. However, 'HQ' is actually a building site. The engineer is not aware that the site type is different because the GET response does not display the type field prominently. What is the most likely cause of the new site being placed under the wrong parent?

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