Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 173
Q2561:
Fill in the blank: The ______ helps to space transmissions and avoid collisions in CSMA/CA.
A. Frame header
B. Interframe Space
C. Preamble
D. Trailer
Correct Answer:
B
Chapter: 173
Q2562:
What is the purpose of the Contention Window in CSMA/CA?
A. To store transmitted data
B. To determine frame size
C. To define waiting time before transmission
D. To encrypt the signal
Correct Answer:
C
Chapter: 173
Q2563:
Which CSMA version is preferred in wireless networks due to its avoidance mechanism?
A. CSMA
B. CSMA/CD
C. CSMA/CA
D. ALOHA
Correct Answer:
C
Chapter: 173
Q2564:
Fill in the blank: In CSMA/CA, the station waits for a random backoff time defined by the ______.
A. Preamble
B. Frame size
C. Contention Window
D. Header
Correct Answer:
C
Chapter: 173
Q2565:
Which of the following is used by CSMA/CA to confirm successful transmission?
A. Ping signal
B. Acknowledgement signal
C. Jamming signal
D. Response code
Correct Answer:
B
Chapter: 173
Q2566:
In CSMA/CA, what happens if no acknowledgement is received?
A. Transmission is considered successful
B. Another station transmits
C. The frame is retransmitted
D. A jamming signal is sent
Correct Answer:
C
Chapter: 173
Q2567:
Which mechanism helps reduce chances of simultaneous transmission in CSMA/CA?
A. Contention Window
B. Jamming frame
C. Sequence Number
D. Synchronous ID
Correct Answer:
A
Chapter: 173
Q2568:
The Interframe Space in CSMA/CA is used to ______.
A. Identify packet type
B. Measure bandwidth
C. Separate successive transmissions
D. Control encryption
Correct Answer:
C
Chapter: 173
Q2569:
Fill in the blank: CSMA/CA is an effective protocol for ______ where collision detection is not practical.
A. Optical fiber
B. Ethernet
C. Wireless networks
D. Wired LANs
Correct Answer:
C
Chapter: 173
Q2570:
Which one of the following strategies is NOT part of CSMA/CA?
A. Interframe Space
B. Address Resolution Protocol
C. Contention Window
D. Acknowledgement
Correct Answer:
B
Chapter: 173
Q2571:
Why is collision detection not practical in wireless networks?
A. Signals are always encrypted
B. The channel is always idle
C. Collision detection consumes bandwidth
D. Signal collision cannot be sensed while transmitting
Correct Answer:
D
Chapter: 173
Q2572:
How does CSMA/CA handle collisions differently from CSMA/CD?
A. By increasing frame size
B. By retrying multiple times
C. By avoiding collisions rather than detecting them
D. By changing frequency range
Correct Answer:
C
Chapter: 173
Q2573:
What occurs immediately after a station senses the channel is idle in CSMA/CA?
A. It transmits immediately
B. It checks for errors
C. It waits for an Interframe Space
D. It sends acknowledgment
Correct Answer:
C
Chapter: 174
Q2574:
What is the purpose of CSMA/CA?
A. Avoid collisions
B. Detect errors
C. Enhance encryption
D. Enable multicast
Correct Answer:
A
Chapter: 174
Q2575:
CSMA/CA was designed primarily for which type of network?
A. Wired networks
B. Fiber optic networks
C. Wireless networks
D. Peer-to-peer networks
Correct Answer:
C
Chapter: 174
Q2576:
What does IFS stand for in CSMA/CA?
A. Initial Frame Sender
B. Idle Frame Status
C. Interframe Space
D. Integrated Frame Service
Correct Answer:
C
Chapter: 174
Q2577:
In CSMA/CA, what does a station do if the channel is idle?
A. Sends immediately
B. Defers transmission for Interframe Space
C. Terminates transmission
D. Waits for acknowledgment
Correct Answer:
B
Chapter: 174
Q2578:
Fill in the blank: In CSMA/CA, a station selects a random number of ______ before transmission.
A. Frames
B. Channels
C. Slots
D. Signals
Correct Answer:
C
Chapter: 174
Q2579:
The Contention Window in CSMA/CA is divided into what?
A. Time slices
B. Data blocks
C. Access codes
D. Slots
Correct Answer:
D
Chapter: 174
Q2580:
What happens to the size of the Contention Window if a channel remains busy?
A. It resets
B. It doubles
C. It halves
D. It stops increasing
Correct Answer:
B