Computer Networks MCQs with Answers
Practice important Computer Networks MCQs with answers and explanations.
Multiple Choice Questions
Q1021: The last address printed by trace-route can be detected by sending:
- A: An ICMP echo request to destination
- B: A TCP SYN packet to destination
- C: A datagram to non-existent application
- D: An ARP request to destination
View Answer
A
Q1022: An ICMP destination unreachable message is generated when a datagram is sent to a ________.
- A: Non-existent IP address
- B: Non-existent application
- C: Non-existent network
- D: Non-existent router
View Answer
B
Q1023: To avoid fragmentation, the source determines the ________, which is the smallest MTU on the path.
- A: Path MTU
- B: Network MTU
- C: Fragment MTU
- D: Packet MTU
View Answer
A
Q1024: The source probes the path MTU by sending datagrams with the ________ flag set.
- A: Fragmentation allowed
- B: Don't fragment
- C: TTL expired
- D: Echo request
View Answer
B
Q1025: Routers respond with which ICMP message if fragmentation is required but not allowed?
- A: Source quench
- B: Fragmentation required
- C: Time exceeded
- D: Destination unreachable
View Answer
B
Q1026: The ICMP fragmentation required message prompts the source to:
- A: Send larger datagrams
- B: Send smaller probes
- C: Resend the same datagram
- D: Drop the connection
View Answer
B
Q1027: ICMP echo request messages are sent by which tool?
- A: Ping
- B: Traceroute
- C: Dig
- D: Ftp
View Answer
A
Q1028: ICMP echo reply messages are sent by:
- A: Source host
- B: Intermediate router
- C: Destination host
- D: Any router
View Answer
C
Q1029: The "don't fragment" flag in IP datagrams is used to:
- A: Allow fragmentation
- B: Prevent fragmentation
- C: Ignore fragmentation
- D: Force fragmentation
View Answer
B
Q1030: When a router discards a packet due to TTL expiry, it sends:
- A: ICMP echo request
- B: ICMP time exceeded
- C: ICMP source quench
- D: ICMP redirect
View Answer
B