PCPP1 Networking And Restful Apis Practice Test 2 — 15 Questions

Question 1

In the 'requests' library, which HTTP method is typically used to update an existing resource on a server?

Accepted Answer

PUT. The PUT method is standard for replacing or updating an existing resource at a specific URI.

Answer

POST

Answer

GET

Answer

DELETE

Question 2

You are building a REST client that needs to handle 429 Too Many Requests status codes. Which strategy is most effective when implementing an automatic retry mechanism?

Accepted Answer

Implement an exponential backoff strategy with jitter. Implementing exponential backoff ensures that you do not overwhelm the server while waiting for the rate limit to reset.

Answer

Switch to a different base URL immediately

Answer

Ignore 429 errors and continue execution

Answer

Retry immediately in a loop until successful

Question 3

When using the 'requests' library to perform a GET request, which parameter should be passed to the 'params' argument to include query string parameters in the URL?

Accepted Answer

A dictionary. The requests library's params argument accepts a dictionary (or list of tuples) that it URL-encodes and appends as a query string. Passing a dict like {'q': 'python', 'page': 2} produces ?q=python&page=2 automatically. This is the idiomatic and documented usage for GET query parameters.

Answer

A tuple of values

Answer

A single formatted string

Answer

A list of strings

Question 4

You are developing a multithreaded HTTP scraper. When using the 'requests' library inside 'threading.Thread' objects, what is the recommended practice for handling session persistence?

Accepted Answer

Initialize a new Session object inside each thread's run method. The requests.Session object is not thread-safe because it maintains shared state such as cookies, connection pools, and headers. Initializing a new Session inside each thread's run method ensures each thread has its own isolated session, avoiding race conditions and data corruption. This is the recommended practice for multithreaded scraping with requests.

Answer

Wrap the session object in a threading.Lock

Answer

Share a single global Session object across all threads

Answer

Disable connection pooling using 'pool_connections=0'

Question 5

When using 'requests.get()', how can you include a custom HTTP header in your request?

Accepted Answer

Use the 'headers' dictionary argument. The 'headers' parameter accepts a dictionary of HTTP headers.

Answer

Use the 'data' argument

Answer

Pass it as part of the URL string

Answer

Use the 'params' dictionary

Question 6

What is the purpose of the 'socket.shutdown()' method in Python?

Accepted Answer

It stops further communication on the socket. shutdown() allows you to stop sending or receiving data on a socket while keeping the file descriptor open.

Answer

It forces the socket to release its memory

Answer

It resets the socket connection immediately

Answer

It closes the file descriptor completely

Question 7

Which status code indicates that a requested resource has been successfully created?

Accepted Answer

201 Created. HTTP status code 201 Created indicates that the request has succeeded and has led to the creation of a new resource. It is typically returned in response to a POST or PUT request that creates a resource, and the response often includes a Location header pointing to the new resource. This is the standard, RFC 7231-defined code for successful resource creation.

Answer

400 Bad Request

Answer

200 OK

Answer

204 No Content

Question 8

You are using 'concurrent.futures.ThreadPoolExecutor' to fetch data from multiple REST APIs. What happens if an exception is raised inside a thread?

Accepted Answer

The exception is stored and raised when calling future.result(). Exceptions raised in a future are captured and re-raised when calling result() on the Future object returned by submit().

Answer

The exception is ignored by the ThreadPoolExecutor

Answer

The entire program crashes immediately

Answer

The thread dies silently without notification

Question 9

You need to send binary data over a socket. Which method should you use on the socket object to ensure all data is sent?

Accepted Answer

sendall(). The sendall() method continues to transmit data from the buffer until all data has been sent or an error occurs.

Answer

write()

Answer

send()

Answer

recv()

Question 10

Which of the following headers is commonly used in REST APIs to indicate the format of the request body?

Accepted Answer

Content-Type. The 'Content-Type' header tells the server what type of media is being sent in the request body.

Answer

Authorization

Answer

Accept

Answer

User-Agent

Question 11

In a multithreaded network application, you observe 'ConnectionResetError'. What is the most likely cause when using Python sockets?

Accepted Answer

The remote server closed the connection abruptly. This occurs when the remote host closes the connection while the local end is still trying to send or receive data.

Answer

The port is already in use by another process

Answer

The socket was never bound

Answer

The local thread pool is exhausted

Question 12

What is the primary difference between the 'socket.AF_INET' and 'socket.AF_INET6' address families?

Accepted Answer

AF_INET is for IPv4; AF_INET6 is for IPv6. AF_INET is for IPv4, while AF_INET6 is for IPv6 addressing.

Answer

AF_INET6 supports UDP only

Answer

AF_INET requires a password

Answer

AF_INET is faster than AF_INET6

Question 13

Which module provides a high-level API for working with URLs, such as parsing and unparsing them?

Accepted Answer

urllib.parse. The 'urllib.parse' module is designed for splitting and joining URL components.

Answer

requests

Answer

socket

Answer

http.client

Question 14

When receiving data from a TCP socket using 'recv(buffer_size)', what does the returned value represent?

Accepted Answer

The data as a byte string. The method returns the bytes received, up to the specified buffer size.

Answer

A boolean indicating connection status

Answer

The total number of bytes in the stream

Answer

The number of packets received

Question 15

You are investigating a network bottleneck in your Python application using `requests`. If you aren't using a `Session` object, what performance-related behavior should you expect?

Accepted Answer

Each request will perform a full TCP handshake. Without a Session, each request creates a new TCP connection, incurring the cost of a three-way handshake every time.

Answer

The application will use more memory

Answer

Connection pooling will be enabled by default

Answer

The server will block your IP immediately