Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 168
Q2481:
Fill in the blank: Collisions in ALOHA occur because multiple stations share the same _______.
A. router
B. frame
C. medium
D. addressing scheme
Correct Answer:
C
Chapter: 168
Q2482:
Which of the following is a disadvantage of pure ALOHA?
A. No need for delay
B. Guaranteed transmission
C. Collision risk
D. Medium-specific usage
Correct Answer:
C
Chapter: 168
Q2483:
What is the main cause of data becoming garbled in ALOHA?
A. Low bandwidth
B. Delayed frames
C. Collision due to simultaneous transmission
D. Weak signal strength
Correct Answer:
C
Chapter: 168
Q2484:
Fill in the blank: In ALOHA, when a collision occurs, the station _______.
A. reboots
B. stops sending forever
C. automatically retries after a delay
D. deactivates its NIC
Correct Answer:
C
Chapter: 168
Q2485:
Which type of frame transmission is used in pure ALOHA?
A. Fixed scheduling
B. Continuous transmission
C. Random frame transmission
D. Slotted transmission
Correct Answer:
C
Chapter: 168
Q2486:
What happens if two ALOHA stations send frames that overlap in time?
A. They are merged
B. They are stored
C. They collide
D. They are acknowledged
Correct Answer:
C
Chapter: 168
Q2487:
Fill in the blank: The _______ method of access was the foundation of many modern random-access protocols.
A. Polling
B. ALOHA
C. CSMA
D. Token Ring
Correct Answer:
B
Chapter: 168
Q2488:
Which protocol laid the groundwork for wireless LAN communication?
A. TDMA
B. ALOHA
C. PPP
D. Frame Relay
Correct Answer:
B
Chapter: 168
Q2489:
Fill in the blank: In pure ALOHA, time is divided into _______.
A. slots
B. frames
C. random intervals
D. epochs
Correct Answer:
C
Chapter: 169
Q2490:
What is the first step a station takes in the ALOHA protocol?
A. Wait for synchronization
B. Transmit the data frame
C. Listen for channel activity
D. Check for collisions
Correct Answer:
B
Chapter: 169
Q2491:
In ALOHA, if a collision occurs, what action does the station take?
A. Stops communication completely
B. Sends an error message
C. Waits a random time and retransmits
D. Changes the channel
Correct Answer:
C
Chapter: 169
Q2492:
Fill in the blank: In the ALOHA protocol, stations transmit data _______.
A. at regular intervals
B. at scheduled times
C. whenever they have data to send
D. after receiving permission
Correct Answer:
C
Chapter: 169
Q2493:
Which of the following describes the procedure of pure ALOHA?
A. Send, wait for acknowledgment, resend on failure
B. Listen, send only if idle
C. Transmit immediately, retransmit after collision
D. Listen, then transmit after delay
Correct Answer:
C
Chapter: 169
Q2494:
Fill in the blank: After transmitting a frame in ALOHA, the station waits for an _______.
A. error
B. log
C. file acknowledgment
Correct Answer:
B
Chapter: 169
Q2495:
What happens if an acknowledgment is not received in ALOHA?
A. The station deletes the frame
B. The station waits forever
C. The station retransmits after a random delay
D. The station sends an error message
Correct Answer:
C
Chapter: 169
Q2496:
In the ALOHA procedure, the purpose of the random delay before retransmission is to _______.
A. ensure faster delivery
B. avoid repeated collisions
C. increase throughput
D. prevent message loss
Correct Answer:
B
Chapter: 169
Q2497:
What determines the waiting time after a collision in ALOHA?
A. Fixed timer
B. Random backoff timer
C. Clock cycle
D. Sequence number
Correct Answer:
B
Chapter: 169
Q2498:
Fill in the blank: If no collision is detected, the ALOHA frame is considered _______.
A. corrupted
B. skipped
C. delivered successfully
D. dropped
Correct Answer:
C
Chapter: 169
Q2499:
Which of the following is true about ALOHA's transmission strategy?
A. It uses token passing
B. It checks for idle lines first
C. It transmits without checking channel status
D. It uses polling
Correct Answer:
C
Chapter: 169
Q2500:
Fill in the blank: In the ALOHA procedure, every frame is sent as a _______.
A. continuous stream
B. high-priority packet
C. standalone unit with acknowledgment
D. ping message
Correct Answer:
C