Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 174
Q2581:
Fill in the blank: Acknowledgements in CSMA/CA help guarantee that the receiver has ______.
A. Sent the frame
B. Received the frame
C. Encrypted the frame
D. Buffered the data
Correct Answer:
B
Chapter: 174
Q2582:
Which mechanism confirms successful reception in CSMA/CA?
A. Ping signal
B. Encryption key
C. Acknowledgement
D. Parity check
Correct Answer:
C
Chapter: 174
Q2583:
What is the role of the time-out timer in CSMA/CA?
A. To count data bits
B. To delay transmission
C. To control encryption
D. To check if frame was received correctly
Correct Answer:
D
Chapter: 174
Q2584:
What is NAV in CSMA/CA?
A. Network Authentication Value
B. Network Access Vector
C. Network Allocation Vector
D. Network Acknowledgement Variable
Correct Answer:
C
Chapter: 174
Q2585:
In CSMA/CA, what is used to avoid immediate retransmission after collision?
A. Contention Signal
B. Contention Window
C. Waiting Frame
D. Acknowledgement
Correct Answer:
B
Chapter: 174
Q2586:
Which of the following is NOT a component of CSMA/CA?
A. Interframe Space
B. Contention Window
C. Acknowledgement
D. Data Compression
Correct Answer:
D
Chapter: 174
Q2587:
Fill in the blank: The ______ in CSMA/CA is a mechanism that indicates how long the channel will be busy.
A. Contention Timer
B. Interframe Sequence
C. Network Allocation Vector
D. Carrier Signal
Correct Answer:
C
Chapter: 174
Q2588:
The Network Allocation Vector (NAV) helps in ______.
A. Reducing encryption
B. Routing the packet
C. Announcing channel usage
D. Identifying user profiles
Correct Answer:
C
Chapter: 174
Q2589:
How does CSMA/CA reduce collisions?
A. By sensing after transmission
B. By increasing signal strength
C. By deferring transmissions
D. By using encryption
Correct Answer:
C
Chapter: 174
Q2590:
If a station fails to detect an idle channel, what happens to the Contention Window?
A. It shrinks
B. It doubles
C. It remains the same
D. It resets
Correct Answer:
B
Chapter: 174
Q2591:
Fill in the blank: CSMA/CA introduces delay after detecting idle channel using the ______.
A. ACK frame
B. Contention Timer
C. Interframe Space
D. Encryption key
Correct Answer:
C
Chapter: 174
Q2592:
The doubling of wait time in CSMA/CA helps in ______.
A. Collision resolution
B. Increasing speed
C. Encoding data
D. Channel encryption
Correct Answer:
A
Chapter: 174
Q2593:
Which strategy in CSMA/CA defers access even when the channel appears idle?
A. Contention Window
B. Encryption Buffer
C. Acknowledgement
D. Interframe Space
Correct Answer:
D
Chapter: 175
Q2594:
In controlled access, what must stations do before sending data?
A. Request access
B. Transmit freely
C. Encrypt the message
D. Receive acknowledgement
Correct Answer:
A
Chapter: 175
Q2595:
Which of the following is NOT a controlled access method?
A. Token Passing
B. Carrier Sensing
C. Polling
D. Reservation
Correct Answer:
B
Chapter: 175
Q2596:
Controlled-access methods include ______, polling, and token passing.
A. Selection
B. Reservation
C. Prioritization
D. Queuing
Correct Answer:
B
Chapter: 175
Q2597:
Fill in the blank: In the ______ method, a station needs to reserve before sending data.
A. Reservation
B. Token Passing
C. Polling
D. Free Access
Correct Answer:
A
Chapter: 175
Q2598:
What is the purpose of the reservation frame in the reservation method?
A. Transmit data
B. Check encryption
C. Make a reservation
D. Encrypt packets
Correct Answer:
C
Chapter: 175
Q2599:
In the reservation method, what precedes data frames in each interval?
A. Data packet
B. Reservation frame
C. Acknowledgement frame
D. Polling signal
Correct Answer:
B
Chapter: 175
Q2600:
Polling works best in which kind of topology?
A. Mesh
B. Ring
C. Bus
D. Star
Correct Answer:
D