Unit 2 - Quiz

1. Which of the following is NOT a service provided by the Data Link Layer to the Network Layer?

• Framing

• Flow Control

• Routing

• Error detection

Which of the following is a reliable service that can be provided by the Data Link Layer?

• Connectionless service
  

• Acknowledged connection-oriented service

• Datagram delivery

• Multicast delivery

Which of the following is an advantage of character count framing?

• Simple to implement
  

• Resilient to synchronization loss

• Immune to bit errors

• Does not require byte alignment

Which method is least affected if a single bit is corrupted?

• Character count
  

• Byte stuffing

• Bit stuffing

• None of these

In a stop-and-wait protocol, the sender:

• Sends frames continuously without acknowledgment

• Waits for acknowledgment before sending the next frame

• Sends all frames in a window before waiting

• Ignores lost frames

Flow control ensures:

• Data is free from errors

• Data is delivered in sequence

• Sender does not overwhelm the receiver

• Transmission speed is always high

Which is NOT a flow control technique?

• Stop-and-wait

• Sliding window

• Piggybacking

• Cyclic redundancy check

CRC stands for:

• Cyclic Redundancy Code

• Cyclic Redundancy Check

• Code Redundancy Check

• Code Repetition Cycle

Hamming code can:

• Only detect errors

• Detect and correct single-bit errors

• Detect burst errors

• Correct multiple-bit errors without detection

Burst errors affect:

• Only 1 bit

• Consecutive group of bits

• Multiple non-consecutive bits

• Only start bits