Computer Networks MCQs with Answers
Practice important Computer Networks MCQs with answers and explanations.
Chapter: 33
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
Correct Answer:
A
Chapter: 33
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
Correct Answer:
B
Chapter: 33
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
Correct Answer:
A
Chapter: 33
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
Correct Answer:
B
Chapter: 33
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
Correct Answer:
B
Chapter: 33
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
Correct Answer:
B
Chapter: 33
Q1027:
ICMP echo request messages are sent by which tool?
A. Ping
B. Traceroute
C. Dig
D. Ftp
Correct Answer:
A
Chapter: 33
Q1028:
ICMP echo reply messages are sent by:
A. Source host
B. Intermediate router
C. Destination host
D. Any router
Correct Answer:
C
Chapter: 33
Q1029:
The "don't fragment" flag in IP datagrams is used to:
A. Allow fragmentation
B. Prevent fragmentation
C. Ignore fragmentation
D. Force fragmentation
Correct Answer:
B
Chapter: 33
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
Correct Answer:
B
Chapter: 33
Q1031:
The source host reduces datagram size when it receives:
A. ICMP echo reply
B. ICMP fragmentation required
C. ICMP destination unreachable
D. ICMP source quench
Correct Answer:
B
Chapter: 33
Q1032:
ICMP fragmentation required message is part of which ICMP message category?
A. Error messages
B. Informational messages
C. Warning messages
D. Acknowledgment messages
Correct Answer:
A
Chapter: 33
Q1033:
Which of the following is NOT a use of ICMP?
A. Error reporting
B. Route discovery
C. Path MTU discovery
D. Data encryption
Correct Answer:
D
Chapter: 33
Q1034:
ICMP time exceeded message is used during:
A. Path MTU discovery
B. Route tracing
C. Reachability testing
D. Fragmentation
Correct Answer:
B
Chapter: 33
Q1035:
The TTL field in IP datagrams stands for:
A. Time to live
B. Time to listen
C. Transport layer timeout
D. Transmission time limit
Correct Answer:
A
Chapter: 33
Q1036:
An ICMP echo request message triggers which response?
A. No response
B. ICMP echo reply
C. ICMP destination unreachable
D. ICMP redirect
Correct Answer:
B
Chapter: 34
Q1037:
IP provides communication between ________.
A. Applications
B. Computers
C. Protocols
D. Networks
Correct Answer:
B
Chapter: 34
Q1038:
Transport protocols provide ________ communication.
A. Computer-to-computer
B. Application-to-application
C. Router-to-router
D. Link-to-link
Correct Answer:
B
Chapter: 34
Q1039:
UDP is part of which protocol suite?
A. TCP/IP
B. HTTP
C. FTP
D. SNMP
Correct Answer:
A
Chapter: 34
Q1040:
UDP provides ________ delivery service.
A. Guaranteed
B. Best-effort
C. Sequenced
D. Connection-oriented
Correct Answer:
B