200-901 Practice Test 14 — 15 Questions

Question 1

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?

Accepted Answer

Update the library to a patched version. Updating the library to a patched version directly resolves the security vulnerability at its source, aligning with the principle of supply chain security in CI/CD pipelines. This practice ensures that the codebase uses a version of the dependency that has been officially fixed by the maintainer, preventing exploitation without altering the application's functionality or introducing unnecessary risk.

Answer

Suppress the warning and proceed

Answer

Add a firewall rule to block the vulnerability

Answer

Remove the dependency and rewrite the code

Question 2

Which tool can be used to explore YANG models locally?

Accepted Answer

pyang. pyang is a tool for validating and converting YANG models.

Answer

yangcatalog.org

Answer

Cisco DevNet sandbox

Answer

Postman

Question 3

An application needs to retrieve a list of network devices from Cisco DNA Center. Which HTTP method should be used against the /dna/intent/api/v1/network-device endpoint?

Accepted Answer

GET. GET is used to retrieve resources in REST APIs.

Answer

PUT

Answer

DELETE

Answer

POST

Question 4

Which three statements about Webex API webhooks are true? (Choose three.)

Accepted Answer

Webhooks deliver event data via HTTP POST to a specified URL.. Webhooks are registered via POST, deliver payload via HTTP POST, and can be filtered by resource/event. They are not secured by OAuth exclusively and do not use long polling.

Answer

Webhooks require OAuth 2.0 client credentials grant for security.

Answer

Webhooks use long polling to receive events.

Question 5

A Python developer is working on a microservices project where one service needs to communicate with another service that exposes a GraphQL API. Which THREE statements about GraphQL compared to REST are accurate? (Choose three.)

Accepted Answer

GraphQL allows clients to request exactly the fields they need.. GraphQL allows querying specific data, uses a single endpoint, and provides a schema.

Answer

GraphQL is a database query language.

Answer

GraphQL typically uses multiple endpoints for different resources.

Question 6

Given the following Python code snippet:

with open('config.json', 'r') as f:
    data = json.load(f)
print(data['interfaces'][0]['name'])

What is the expected output if config.json contains {"interfaces": [{"name": "GigabitEthernet0/1"}]}?

Accepted Answer

GigabitEthernet0/1. json.load() reads the file and returns a dict; then accessing the nested structure yields 'GigabitEthernet0/1'.

Answer

None

Answer

interfaces

Answer

Error: list indices must be integers

Question 7

In version control with Git, which command creates a new branch and switches to it in one step?

Accepted Answer

git checkout -b . git checkout -b creates and switches. git branch creates but does not switch. git switch -c is also valid but not listed.

Answer

git checkout

Answer

git branch <branch>

Answer

git switch <branch>

Question 8

Which THREE of the following are characteristics of NETCONF? (Select THREE)

Accepted Answer

Uses SSH as the transport protocol. NETCONF uses SSH for transport, XML-encoded RPCs, and operations like edit-config/get-config. It does not use HTTP or JSON, and it is not stateless.

Answer

Uses HTTP as the transport protocol

Answer

Supports JSON encoding for data

Question 9

Given the JSON string: '{"name": "Alice", "scores": [90, 85, 92]}', which Python code correctly extracts the second score (85)?

Accepted Answer

json.loads(json_str)['scores'][1]. json.loads converts to dict, then access scores list index 1.

Answer

json.dumps(json_str)['scores'][1]

Answer

json_str['scores'][1]

Answer

json.loads(json_str)['scores'][2]

Question 10

A Python function is defined as:

def process(*args, **kwargs):
    return sum(args) + kwargs.get('offset', 0)

What is the result of process(1, 2, 3, offset=10)?

Accepted Answer

16. *args captures positional arguments as tuple (1,2,3), sum is 6, kwargs dict includes {'offset':10}, .get returns 10, total 16.

Answer

6

Answer

Error

Answer

10

Question 11

A developer is using Git for a project with a feature branch strategy. They have completed work on a new feature in the branch 'feature-logging' and want to integrate it into the main development branch 'develop'. The team requires that all commits on the feature branch be squashed into a single commit before merging. Which sequence of Git commands achieves this?

Accepted Answer

git checkout develop && git merge feature-logging --squash && git commit. Squash merging combines all commits into one; using --squash option on merge accomplishes this.

Answer

git checkout feature-logging && git rebase develop && git checkout develop && git merge feature-logging

Answer

git checkout develop && git pull feature-logging && git commit --amend

Answer

git checkout develop && git merge --no-ff feature-logging

Question 12

A developer is writing a Python script to iterate over a list of server hostnames. Which loop structure is most appropriate to process each hostname in the list?

Accepted Answer

for hostname in hostnames: print(hostname). The 'for item in list' loop iterates directly over each element, making it the simplest and most readable for processing each hostname.

Answer

for i, hostname in enumerate(hostnames): print(hostname)

Answer

while len(hostnames) > 0: print(hostnames.pop())

Answer

for i in range(len(hostnames)): print(hostnames[i])

Question 13

A Python script sends a POST request to create a new network device resource. The API returns HTTP status code 201 and a JSON response with the device ID. How should the script correctly extract the device ID from the response?

Accepted Answer

device_id = response.json().get('id'). A 201 status indicates successful creation, and response.json() parses the JSON body into a Python dict.

Answer

device_id = response['id']

Answer

device_id = response.text['id']

Answer

device_id = json.loads(response)['id']

Question 14

Which THREE of the following are valid NETCONF operations? (Choose three.)

Accepted Answer

. NETCONF defines standard operations: , , , , , , , , . is used in the candidate configuration model but is not a base operation; it's an optional capability. is the message wrapper, not an operation.

Answer

<rpc>

Answer

Question 15

A developer needs to parse a JSON string received from a REST API into a Python dictionary. Which function should they use?

Accepted Answer

json.loads(). json.loads() converts a JSON string into a Python object (dict, list, etc.).

Answer

json.dumps()

Answer

json.load()

Answer

json.dump()