Computer Networks MCQs with Answers
Practice important Computer Networks MCQs with answers and explanations.
Chapter: 30
Q921:
SOURCE DIST IP ADDRESS field shows the IP addresses of ________.
A. Router and Gateway
B. Source and destination
C. Source only
D. Destination only
Correct Answer:
B
Chapter: 30
Q922:
IP datagram options like record route and timestamp are placed between which two fields?
A. Source address and destination address
B. Destination address and data
C. Header checksum and source address
D. TTL and protocol
Correct Answer:
B
Chapter: 30
Q923:
Network interface layer encapsulates IP datagram as data area in ________.
A. Hardware frame
B. Transport layer
C. Application layer
D. Router packet
Correct Answer:
A
Chapter: 30
Q924:
How does the hardware frame interpret IP datagram format?
A. It fully understands it
B. It partially understands it
C. It ignores it
D. It processes it based on TTL
Correct Answer:
C
Chapter: 30
Q925:
At each hop, the router ________ the datagram from the incoming frame and ________ it into the outgoing frame.
A. Encapsulates, decapsulates
B. Decapsulates, encapsulates
C. Modifies, drops
D. Fragments, reassembles
Correct Answer:
B
Chapter: 30
Q926:
MTU stands for ________.
A. Maximum Transfer Unit
B. Minimum Transmission Unit
C. Maximum Transmission Unit
D. Minimum Transfer Unit
Correct Answer:
C
Chapter: 30
Q927:
In a heterogeneous network, when the downstream MTU is smaller than local MTU, what happens to large datagrams?
A. They are dropped
B. They are fragmented
C. They are sent as is
D. They are delayed
Correct Answer:
B
Chapter: 30
Q928:
Fragmentation in IP allows datagrams to be ________.
A. Split to fit network MTU
B. Combined for efficiency
C. Encrypted for security
D. Sent faster
Correct Answer:
A
Chapter: 30
Q929:
Each fragment of a datagram is treated as a(n) ________.
A. Independent datagram
B. Packet with no header
C. Fragment without header
D. Reassembled packet
Correct Answer:
A
Chapter: 30
Q930:
Which field indicates that a datagram is a fragment?
A. TTL
B. FLAGS
C. IDENT
D. TOTAL LENGTH
Correct Answer:
B
Chapter: 30
Q931:
What information does the Fragment Offset field provide?
A. Fragment size
B. Original location of fragment
C. Next hop address
D. Datagram length
Correct Answer:
B
Chapter: 30
Q932:
Who performs the reassembly of IP datagram fragments?
A. Source host
B. Intermediate routers
C. Ultimate destination
D. All routers
Correct Answer:
C
Chapter: 30
Q933:
If fragments arrive out of order, how are they correctly reassembled?
A. Using fragment size
B. Using fragment offset
C. Using checksum
D. Using TTL
Correct Answer:
B
Chapter: 30
Q934:
The IDENT field in IP fragments is used to ________.
A. Identify protocol
B. Match fragments to original datagram
C. Count fragments
D. Calculate checksum
Correct Answer:
B
Chapter: 30
Q935:
What happens if a fragment is lost during transmission?
A. The entire datagram is dropped
B. A new datagram is created
C. The lost fragment is ignored
D. Only the lost fragment is retransmitted
Correct Answer:
A
Chapter: 30
Q936:
How does the destination detect a lost fragment?
A. By sending an error message
B. By using a timer
C. By counting fragments
D. By requesting retransmission
Correct Answer:
B
Chapter: 30
Q937:
If a fragment needs to be further fragmented, this process is called ________.
A. Fragmenting a fragment
B. Reassembly
C. Multiplexing
D. Sub-fragmenting
Correct Answer:
A
Chapter: 30
Q938:
Sub-fragments must include ________ to allow correct reassembly.
A. Size only
B. Original fragment size
C. Position in original datagram
D. Checksum
Correct Answer:
C
Chapter: 30
Q939:
TTL value in an IP datagram is decremented by ________.
A. Source host
B. Each router
C. Each switch
D. Destination host
Correct Answer:
B
Chapter: 30
Q940:
IP datagram fragmentation occurs when datagram size is ________ than network MTU.
A. Less
B. Equal
C. Greater
D. Zero
Correct Answer:
C