200-901 Software Development and Design Practice Test 4 — 15 Questions

Question 1

A developer is implementing exception handling in Python for a function that makes an HTTP request. Which THREE exception types should be caught to handle common network and HTTP errors? (Choose three.)

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

requests.exceptions.ConnectionError. `requests.exceptions.ConnectionError` is raised when a network connection cannot be established, such as DNS resolution failure or refused TCP connection. This is a fundamental network error that must be handled in any HTTP client to ensure robust error recovery.

Answer

requests.exceptions.InvalidURL

Answer

requests.exceptions.TooManyRedirects

Question 2

Which TWO of the following are valid branching strategies in Git? (Choose two.)

Accepted Answer

GitFlow. GitFlow is a valid branching strategy that defines a strict model for managing releases, hotfixes, and feature development using dedicated branches like 'develop', 'release/*', and 'hotfix/*'. It is widely used in enterprise environments to maintain a clean history and support parallel development.

Answer

Linear branching

Answer

Monolithic branching

Answer

Copy-on-write branching

Question 3

Which Python data type is mutable and unordered?

Accepted Answer

Dictionary. Options C (Dictionary) and D (Set) are both correct because dictionaries and sets are mutable and unordered. Dictionaries store key-value pairs and sets store unique elements, both allowing addition/removal without guaranteed order (prior to Python 3.7 for dicts, and always for sets). Lists (A) are mutable but ordered, and tuples (B) are immutable and ordered, making them incorrect.

Answer

List

Answer

Tuple

Question 4

What is the output of the following code?

my_list = [1, 2, 3]
for i in range(len(my_list)):
    my_list[i] += 1
print(my_list)

Accepted Answer

[2, 3, 4]. The code modifies each element by adding 1. So [1,2,3] becomes [2,3,4].

Answer

[1, 2, 3, 1]

Answer

[1, 2, 3]

Answer

Error

Question 5

Which HTTP status code indicates a successful POST request that created a resource?

Accepted Answer

201 Created. 201 Created is the standard response for a successful POST that creates a new resource.

Answer

200 OK

Answer

400 Bad Request

Answer

204 No Content

Question 6

A developer is building a REST API client in Python using the requests library. They need to send a JSON payload with authentication. Which code snippet correctly sends a POST request with a JSON body and a Bearer token?

Accepted Answer

requests.post(url, json=payload, headers={'Authorization': f'Bearer {token}'}). The correct way is to use json parameter for JSON body and headers for authorization.

Answer

requests.post(url, data=payload, auth=token)

Answer

requests.post(url, data=json.dumps(payload), headers={'Authorization': token})

Answer

requests.post(url, params=payload, auth=('Bearer', token))

Question 7

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 8

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 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

In a microservices architecture, which communication pattern is typically asynchronous and decoupled?

Accepted Answer

Event-driven architecture. Event-driven architecture (D) is the correct answer because it is inherently asynchronous and decoupled: services communicate by publishing events to a message broker (e.g., Kafka, RabbitMQ) without needing to know about the consumers. This pattern allows the producer to emit an event and continue processing immediately, while consumers react to events at their own pace, achieving loose coupling and high scalability.

Answer

REST over HTTP

Answer

SOAP

Answer

gRPC

Question 11

Which Git branching strategy typically involves a long-lived 'develop' branch where feature branches are merged, and releases are created from a 'release' branch?

Accepted Answer

GitFlow. GitFlow is correct because it defines a long-lived 'develop' branch for integrating feature branches, and a separate 'release' branch for preparing releases. This strategy uses dedicated branches for features, releases, and hotfixes, with strict merging rules back to 'develop' and 'main'.

Answer

GitHub Flow

Answer

Trunk-based development

Answer

Feature branch workflow

Question 12

A developer uses the requests library to call an API. The API returns 429 Too Many Requests. What is the best practice to handle this?

Accepted Answer

Use exponential backoff and retry. Implement retry with exponential backoff to respect rate limiting.

Answer

Ignore the status code and proceed

Answer

Immediately retry the request

Answer

Wait a fixed amount of time and retry

Question 13

Which Python exception would be raised by the following code?

my_dict = {'a': 1}
value = my_dict['b']

Accepted Answer

KeyError. Accessing a dictionary key that does not exist raises a KeyError in Python. In the code, my_dict['b'] attempts to retrieve the value for key 'b', which is not present in the dictionary {'a': 1}, so Python raises KeyError.

Answer

ValueError

Answer

IndexError

Answer

AttributeError

Question 14

Which TWO statements about the MVC pattern are correct? (Choose two.)

Accepted Answer

Controller handles user input and updates the Model.. MVC separates Model (data), View (UI), Controller (logic). Controller updates Model, View reflects Model.

Answer

Model is dependent on the View.

Answer

Model represents the user interface.

Answer

View directly modifies the Model.

Question 15

Which THREE of the following are characteristics of GraphQL compared to REST? (Choose three.)

Accepted Answer

Typically uses a single endpoint.. GraphQL allows querying exactly needed data, uses a single endpoint, and clients specify fields.

Answer

Over-fetching of data is common.

Answer

Multiple endpoints for different resources.