PCPP1 Networking And Restful Apis Practice Test 2 — 15 Questions

Question 1

You are parsing a JSON response that contains a large list of objects. Which technique is most memory-efficient for processing these objects?

Accepted Answer

Iterate through the list object after parsing. If you have control over the response, streaming the JSON or processing it iteratively (if supported by the parser) saves memory.

Answer

Convert the entire JSON to a string then split

Answer

Use the 'json.loads()' method on the full response

Answer

Use a custom regex to parse the JSON

Question 2

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 3

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 4

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 5

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

Question 6

How do you properly handle a non-200 status code when using 'requests' if you want to avoid manual status code checking?

Accepted Answer

Use response.raise_for_status(). Calling response.raise_for_status() will raise an HTTPError exception if the status code indicates an error (4xx or 5xx).

Answer

Use a decorator on the request function

Answer

Check response.error

Answer

The library raises an exception by default

Question 7

When implementing a timeout in 'requests.get()', what is the consequence of setting it as a single float (e.g., timeout=5)?

Accepted Answer

It limits both the connection and read time to 5 seconds. Providing a single value sets both the connect and read timeouts to that value.

Answer

It only limits the read phase

Answer

It causes an error because a tuple is expected

Answer

It only limits the connection phase

Question 8

In Python socket programming, what does the 'SO_REUSEADDR' socket option achieve?

Accepted Answer

It allows the address to be reused immediately after the server stops. It allows the socket to bind to a port that is in a TIME_WAIT state, commonly used to restart servers quickly.

Answer

It speeds up data transmission

Answer

It enables broadcasting on the socket

Answer

It prevents the socket from closing

Question 9

When sending a JSON payload with 'requests.post()', which argument should you use to automatically set the 'Content-Type' to 'application/json'?

Accepted Answer

json=payload. The 'json' argument automatically serializes the data and sets the correct headers.

Answer

data=json.dumps(payload)

Answer

params=payload

Answer

body=payload

Question 10

Which standard Python library module is used for lower-level networking and creating server/client sockets?

Accepted Answer

socket. The 'socket' module is the standard low-level interface to the network stack.

Answer

http.server

Answer

requests

Answer

networking

Question 11

You are building a custom HTTP client and need to handle persistent connections (keep-alive). What is the primary role of the 'Connection' header?

Accepted Answer

To request the reuse of the TCP connection. The 'Connection: keep-alive' header tells the server that the client wants to reuse the same TCP connection for multiple requests.

Answer

To signal that the server is alive

Answer

To encrypt the connection

Answer

To set the timeout for the connection

Question 12

Which THREE of the following are valid HTTP request methods commonly used in RESTful API design?

Accepted Answer

DELETE. GET, POST, and DELETE are standard HTTP verbs used in RESTful interactions.

Answer

SEND

Answer

FETCH

Question 13

Which THREE of the following are attributes of the 'requests.Response' object?

Accepted Answer

text. status_code, text, and json() are core attributes/methods of the Response object.

Answer

socket

Answer

connect()

Question 14

You need to perform a HEAD request to check if a file exists on a server without downloading the body. How is this done with 'requests'?

Accepted Answer

requests.head(url). The requests.head() method sends a HEAD request, which only retrieves headers.

Answer

requests.post(url, data={'type': 'head'})

Answer

requests.options(url)

Answer

requests.get(url, headers={'Method': 'HEAD'})

Question 15

Which TWO of the following are potential pitfalls when using multithreading for network operations in Python?

Accepted Answer

Race conditions when accessing shared state. Global Interpreter Lock (GIL) limitations and race conditions on shared objects are common issues in Python multithreading.

Answer

Threads always execute slower than single-threaded code

Answer

Threads consume more memory than processes

Answer

Socket objects are automatically thread-safe