Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 167
Q2461:
What is the role of the protocol in a random-access system?
A. To assign control to one station
B. To regulate access based on medium state
C. To define the routing path
D. To encrypt communication
Correct Answer:
B
Chapter: 167
Q2462:
Fill in the blank: In random-access protocols, if the medium is _______ the station can send data.
A. idle
B. overloaded
C. busy
D. secured
Correct Answer:
A
Chapter: 167
Q2463:
What happens if the medium is busy in a random-access protocol?
A. The station sends data anyway
B. The station waits for the medium to become idle
C. The station aborts the transmission
D. The station sends a signal to clear the medium
Correct Answer:
B
Chapter: 167
Q2464:
Which of the following is true about contention in random-access protocols?
A. Stations have priority based on data size
B. Stations compete for the medium based on availability
C. One station always controls the medium
D. Stations wait for permission from a leader
Correct Answer:
B
Chapter: 167
Q2465:
Fill in the blank: In random-access protocols, contention happens when _______. two stations attempt to send at the same time
A. one station has control
B. there is only one station
C. active transmission is completed
Correct Answer:
A
Chapter: 167
Q2466:
What does the decision to send in random-access protocols depend on?
A. Network speed
B. Medium availability
C. Protocol type
D. Station priority
Correct Answer:
B
Chapter: 167
Q2467:
In random-access, if two stations attempt to send data simultaneously, this leads to a _______.
A. Conflict
B. Failure
C. Transmission complete
D. Successful data transfer
Correct Answer:
A
Chapter: 167
Q2468:
What occurs when two stations send data at the same time in a random-access system?
A. The data is successfully transmitted without issues
B. A collision happens, and both stations must resend their data
C. One station succeeds while the other is ignored
D. The protocol stops transmission
Correct Answer:
B
Chapter: 167
Q2469:
Fill in the blank: The process where two stations send data simultaneously and cause issues in random-access protocols is called a _______.
A. collision
B. conflict
C. saturation
D. error
Correct Answer:
B
Chapter: 168
Q2470:
What is the name of the earliest random access method?
A. CSMA
B. ALOHA
C. PPP
D. TDMA
Correct Answer:
B
Chapter: 168
Q2471:
ALOHA protocol was developed in which decade?
A. 1960s
B. 1980s
C. 1970s
D. 1990s
Correct Answer:
C
Chapter: 168
Q2472:
ALOHA was originally designed for which type of LAN?
A. Optical
B. LAN over cable
C. Radio (wireless) LAN
D. Satellite LAN
Correct Answer:
C
Chapter: 168
Q2473:
ALOHA can be used on which type of medium?
A. Dedicated medium
B. Any shared medium
C. Fiber optic only
D. Private medium
Correct Answer:
B
Chapter: 168
Q2474:
Which problem arises when two stations send data at the same time in ALOHA?
A. Success
B. No effect
C. Collision
D. Multiplexing
Correct Answer:
C
Chapter: 168
Q2475:
Fill in the blank: When two stations transmit at the same time in ALOHA, their data _______.
A. is prioritized by ID
B. is automatically queued
C. collides and becomes garbled
D. is stored for later use
Correct Answer:
C
Chapter: 168
Q2476:
Which of the following happens in ALOHA during a collision?
A. Data is forwarded
B. Data is delayed
C. Data is garbled
D. Data is split into frames
Correct Answer:
C
Chapter: 168
Q2477:
What type of access does the ALOHA protocol use?
A. Centralized
B. Coordinated
C. Random
D. Sequential
Correct Answer:
C
Chapter: 168
Q2478:
Fill in the blank: ALOHA is an example of a _______ access protocol.
A. Random
B. Scheduled
C. Controlled
D. Fixed
Correct Answer:
A
Chapter: 168
Q2479:
In ALOHA, what does a station do after detecting a collision?
A. Stops transmission
B. Waits for synchronization
C. Resends after a random delay
D. Resends immediately
Correct Answer:
C
Chapter: 168
Q2480:
ALOHA is best suited for _______.
A. Optical fiber networks
B. Full-duplex Ethernet
C. Wireless and shared media
D. Private leased lines
Correct Answer:
C