PCPP2 Practice Test 6 — 10 Questions

Question 1

Which THREE of the following socket attributes or methods are relevant to managing socket timeouts?

Accepted Answer

socket.settimeout(). settimeout() sets the delay, gettimeout() retrieves it, and the socket might raise a timeout exception.

Answer

socket.listen()

Answer

socket.setblocking()

Question 2

You are configuring a socket timeout. What happens if you call socket.settimeout(5.0) and the operation exceeds 5 seconds?

Accepted Answer

A socket.timeout exception is raised.. A timeout sets a limit on blocking operations; if the time is exceeded, a socket.timeout exception is raised.

Answer

The socket automatically closes.

Answer

The operation returns None.

Answer

The kernel silently drops the connection.

Question 3

Which TWO of the following methods are typically used on a TCP server socket?

Accepted Answer

socket.listen(). A TCP server uses bind() to assign the address and listen() to prepare for incoming connections.

Answer

socket.sendall()

Answer

socket.recvfrom()

Answer

socket.connect()

Question 4

Which TWO of the following are common issues when using select.select()?

Accepted Answer

It is inefficient for monitoring thousands of concurrent sockets.. select is limited by the maximum number of file descriptors (FD_SETSIZE) and is not as efficient as epoll/kqueue for massive numbers of connections.

Answer

It requires root privileges to execute.

Answer

It is significantly faster than epoll on all platforms.

Answer

It cannot be used with non-blocking sockets.

Question 5

Which TWO of the following are true regarding the socket.shutdown() method?

Accepted Answer

It can be used to disable only the receiving side of the socket.. shutdown() can disable reading, writing, or both, which is useful for protocol-level signaling.

Answer

It is identical to the close() method.

Answer

It causes an immediate memory deallocation of the socket object.

Answer

It automatically reopens the socket if called twice.

Question 6

When managing resources like file handles, what is the best practice to ensure they are always closed?

Accepted Answer

Using a context manager (with statement). The with statement (context manager) ensures that cleanup code is executed regardless of exceptions.

Answer

Manually calling .close()

Answer

Relying on garbage collection

Answer

Using a try-finally block

Question 7

Which TWO of the following are valid ways to create a generator in Python?

Accepted Answer

Defining a function containing the 'yield' keyword. Generators can be created via generator expressions (using parentheses) or generator functions (using the yield keyword).

Answer

Calling the gen() function on a class

Answer

Using the @generator decorator

Answer

Using a list comprehension with brackets

Question 8

You need to compare two objects for equality based on a custom attribute. Which method should you override?

Accepted Answer

__eq__. The __eq__ magic method defines the behavior of the equality operator (==).

Answer

__hash__

Answer

__identical__

Answer

__cmp__

Question 9

You are applying the Facade pattern to simplify a complex subsystem consisting of three interacting legacy modules. What is the primary architectural requirement for the Facade class to be effective?

Accepted Answer

The Facade should provide a simplified interface that delegates requests to appropriate subsystem objects. The Facade must act as a single entry point, encapsulating the complexity of the internal modules so the client doesn't need to know about them.

Answer

The Facade must inherit from every class in the subsystem

Answer

The Facade must implement the Singleton pattern to ensure only one interface exists

Answer

The Facade should expose all methods of the subsystem classes for flexibility

Question 10

Which TWO of the following are common risks when implementing the Singleton pattern in Python?

Accepted Answer

Race conditions in multi-threaded environments during instantiation. Global state and threading issues are the most prominent risks when implementing the Singleton pattern.

Answer

Incompatibility with the abc module

Answer

Excessive subclassing of the Singleton class

Answer

Increased memory consumption for every instance