CS Systems & Networking 2

Question 1

A process attempts to read a file but the required page is not in physical memory. What happens next?

Accepted Answer

A page fault occurs and the OS loads the page from disk

Answer

A page fault triggers the OS to fetch the missing page from secondary storage into RAM.

Question 2

Which TCP mechanism prevents a fast sender from overwhelming a slow receiver?

Accepted Answer

Flow control using the sliding window

Answer

TCP flow control uses the receiver's advertised window to limit how much data the sender can transmit.

Question 3

In a UNIX-like system, what does the fork() system call return to the parent process?

Accepted Answer

The child's process ID

Answer

fork() returns the child's PID to the parent and 0 to the child.

Question 4

Which layer of the OSI model is responsible for routing packets between different networks?

Accepted Answer

Network layer

Answer

The network layer (layer 3) handles logical addressing and routing across networks.

Question 5

Two threads increment a shared counter without synchronization and the final value is sometimes wrong. What is this problem called?

Accepted Answer

A race condition

Answer

A race condition occurs when the outcome depends on the unsynchronized interleaving of concurrent operations.

(CS) Computer Science Practice Test