Computer Networks MCQs with Answers
Practice important Computer Networks MCQs with answers and explanations.
Chapter: 32
Q1001:
ICMP informational messages include:
A. Echo request/reply
B. Router discovery
C. Address mask request/reply
D. All of the above
Correct Answer:
D
Chapter: 32
Q1002:
IPv6 fragmentation header is inserted after:
A. Base header
B. Extension header
C. Transport header
D. Application header
Correct Answer:
A
Chapter: 32
Q1003:
Path MTU discovery must be dynamic because:
A. Network speed changes
B. Path may change during transmission
C. IP addresses change
D. Source changes
Correct Answer:
B
Chapter: 32
Q1004:
The next header field in IPv6 points to:
A. First extension header
B. Payload
C. Data link layer
D. Previous header
Correct Answer:
A
Chapter: 32
Q1005:
Multiple headers in IPv6 improve:
A. Efficiency
B. Flexibility
C. Incremental development
D. All of the above
Correct Answer:
D
Chapter: 32
Q1006:
The ICMP message “Time exceeded” indicates:
A. Packet was delivered late
B. TTL expired
C. Fragmentation required
D. Source quench
Correct Answer:
B
Chapter: 32
Q1007:
Which ICMP error message is sent when fragmentation is needed but not allowed?
A. Source quench
B. Time exceeded
C. Fragmentation required
D. Redirect
Correct Answer:
C
Chapter: 32
Q1008:
The ICMP “Redirect” message is used to:
A. Inform host of better route
B. Stop datagram delivery
C. Inform about fragmentation
D. Error reporting
Correct Answer:
A
Chapter: 32
Q1009:
ICMP “Source quench” message indicates:
A. Source is sending too fast
B. Packet is corrupted
C. Packet is lost
D. Route is unavailable
Correct Answer:
A
Chapter: 32
Q1010:
IPv6 fragmentation headers have a fixed size of:
A. 40 octets
B. 8 octets
C. Variable size
D. 128 bits
Correct Answer:
C
Chapter: 32
Q1011:
Path MTU discovery sends probes to:
A. Destination
B. Intermediate routers
C. Source
D. All nodes
Correct Answer:
A
Chapter: 33
Q1012:
ICMP messages are encapsulated within which protocol?
A. TCP
B. UDP
C. IP
D. FTP
Correct Answer:
C
Chapter: 33
Q1013:
An ICMP message is sent in response to incoming datagrams with problems, but not for ________.
A. IP datagrams
B. ICMP messages
C. TCP packets
D. UDP datagrams
Correct Answer:
B
Chapter: 33
Q1014:
The program used to test reachability of a host using ICMP is called ________.
A. Traceroute
B. Ping
C. FTP
D. HTTP
Correct Answer:
B
Chapter: 33
Q1015:
Ping uses which ICMP message types?
A. Echo request and echo reply
B. Destination unreachable and redirect
C. Source quench and time exceeded
D. Fragmentation required and echo reply
Correct Answer:
A
Chapter: 33
Q1016:
If host A is reachable from host B, it means datagrams can be delivered from ________ to ________.
A. A to B
B. B to A
C. A to C
D. B to C
Correct Answer:
A
Chapter: 33
Q1017:
The list of all routers on the path from host A to host B is called the ________.
A. Route table
B. Route trace
C. Network path
D. Route path
Correct Answer:
D
Chapter: 33
Q1018:
When a router decrements the TTL of a packet to zero, it sends which ICMP message?
A. Source quench
B. Time exceeded
C. Destination unreachable
D. Redirect
Correct Answer:
B
Chapter: 33
Q1019:
The tool "tracert" sends ICMP echo messages with ________ TTL values.
A. Decreasing
B. Increasing
C. Random
D. Constant
Correct Answer:
B
Chapter: 33
Q1020:
Trace-route continues until it receives which message from the destination?
A. ICMP echo request
B. ICMP echo reply
C. ICMP destination unreachable
D. ICMP source quench
Correct Answer:
B