50 Computer Networks MCQs with Answers

Question 11

The protocol data unit (PDU) for the application layer in the Internet stack is

• Segment
• Datagram
• Message
• Frame

Question 12

What is the maximum size of data that the application layer can pass on to the TCP layer below?

• A
• B
• C
• D

Question 13

Match the following:

• (1)

• (2)

• (3)

• (4)

Question 14

A TCP server application is programmed to listen on port number P on host S. A TCP client is connected to the TCP server over the network. Consider that while the TCP connection was active, the server machine S crashed and rebooted. Assume that the client does not use the TCP keepalive timer. Which of the following behaviors is/are possible?

• If the client was waiting to receive a packet, it may wait indefinitely
• The TCP server application on S can listen on P after reboot
• If the client sends a packet after the server reboot, it will receive a RST segment
• If the client sends a packet after the server reboot, it will receive a FIN segment

Question 15

SSL is not responsible for

• Mutual authentication of client & server
• Secret communication
• Data Integrity protection
• Error detection and correction

Question 16

Silly Window Syndrome is related to

• Error during transmission

• File transfer protocol

• Degrade in TCP performance

• Interface problem

Question 17

Which of the following control fields in TCP header is used to specify whether the sender has no more data to transmit?

• FIN
• RST
• SYN
• PSH

Question 18

Four channels are multiplexed using TDM. If each channel sends 100 bytes/second and we multiplex 1 byte per channel, then the bit rate for the link is __________.

• 400 bps
• 800 bps
• 1600 bps
• 3200 bps

Question 19

Optical fiber uses reflection to guide light through a channel, in which angle of incidence is ________ the critical angle.

• equal to
• less than
• greater than
• less than or equal to

Question 20

Assume that source S and destination D are connected through two intermediate routers labeled R. Determine how many times each packet has to visit the network layer and the data link layer during a transmission from S to D.

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• Network layer – 4 times and Data link layer – 4 times

• Network layer – 4 times and Data link layer – 3 times

• Network layer – 4 times and Data link layer – 6 times

• Network layer – 2 times and Data link layer – 6 times