Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 184
Q2801:
Fill in the blank: Ethernet with CSMA/CD can lead to _______ if many devices transmit at the same time.
A. improved speed
B. reduced errors
C. collisions
D. increased security
Correct Answer:
C
Chapter: 184
Q2802:
What is one disadvantage of the 1-Persistent method?
A. No collisions happen
B. Too much waiting
C. It reduces network speed
D. It increases collision chances
Correct Answer:
D
Chapter: 184
Q2803:
In a CSMA/CD network, what happens during collision detection?
A. The transmission continues
B. A jamming signal is sent
C. Devices ignore it
D. An alert is broadcast
Correct Answer:
B
Chapter: 185
Q2804:
What does the ratio of time used to send data vs. time the medium is occupied represent?
A. Throughput
B. Efficiency
C. Latency
D. Bandwidth
Correct Answer:
B
Chapter: 185
Q2805:
What is the practical efficiency formula of standard Ethernet?
A. E = 1 / (1 + 2a)
B. E = a / (1 + a)
C. E = 1 / (1 + 6.4a)
D. E = 1 / (6.4 + a)
Correct Answer:
C
Chapter: 185
Q2806:
In the formula Efficiency = 1 / (1 + 6.4 × a), what does 'a' represent?
A. Signal attenuation
B. Frequency cycles
C. Frame transmission time
D. Number of frames that can fit on the medium
Correct Answer:
D
Chapter: 185
Q2807:
Fill in the blank: The practical efficiency of standard Ethernet is calculated using the formula ________.
A. E = a / (1 + a)
B. E = 1 / (1 + 6.4 × a)
C. E = 6.4a / (1 + a)
D. E = 1 / a
Correct Answer:
B
Chapter: 185
Q2808:
As 'a' increases in the Ethernet efficiency formula, the efficiency of the network:
A. Increases
B. Decreases
C. Remains constant
D. Doubles
Correct Answer:
B
Chapter: 185
Q2809:
Efficiency of Ethernet is affected by the ratio of frame transmission time to:
A. Network latency
B. Total number of stations
C. Propagation delay
D. Medium bandwidth
Correct Answer:
C
Chapter: 185
Q2810:
Which of the following reduces Ethernet efficiency?
A. Lower frame size
B. Higher propagation delay
C. Higher value of 'a'
D. All of the above
Correct Answer:
D
Chapter: 185
Q2811:
Fill in the blank: In Ethernet, the value of 'a' is directly related to ________.
A. Frame size
B. Network speed
C. Delay and distance
D. Transmission error
Correct Answer:
C
Chapter: 185
Q2812:
The term 'a' in the efficiency formula of Ethernet signifies:
A. Latency factor
B. Bandwidth division
C. Collision rate
D. Frame fitting ratio
Correct Answer:
D
Chapter: 185
Q2813:
What does a lower value of 'a' indicate in Ethernet communication?
A. Higher efficiency
B. More collisions
C. Lower bandwidth
D. Higher delay
Correct Answer:
A
Chapter: 185
Q2814:
In Ethernet's efficiency calculation, a value of 'a' close to 0 results in:
A. Low efficiency
B. High efficiency
C. No transmission
D. No change
Correct Answer:
B
Chapter: 185
Q2815:
What unit is typically used to express 'a' in Ethernet efficiency?
A. Milliseconds
B. Frames per second
C. Frames per delay
D. No unit
Correct Answer:
C
Chapter: 185
Q2816:
Efficiency = 1 / (1 + 6.4 × a) shows the inverse relation between efficiency and ________.
A. frame count
B. latency
C. value of 'a'
D. collision duration
Correct Answer:
C
Chapter: 185
Q2817:
Which factor does NOT affect the value of 'a' in Ethernet?
A. Propagation delay
B. Frame length
C. Transmission rate
D. User IP address
Correct Answer:
D
Chapter: 185
Q2818:
Ethernet efficiency formula assumes that:
A. Collision never occurs
B. There is infinite bandwidth
C. Frames are of fixed length
D. A is based on delay and transmission speed
Correct Answer:
D
Chapter: 185
Q2819:
Which of the following can improve Ethernet efficiency?
A. Increasing propagation delay
B. Using smaller frames
C. Decreasing the value of 'a'
D. Adding more stations
Correct Answer:
C
Chapter: 185
Q2820:
Fill in the blank: Practical Ethernet efficiency is always _______ than theoretical maximum.
A. higher
B. equal
C. less
D. unpredictable
Correct Answer:
C