Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
C
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
View Answer
D
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
View Answer
B
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
View Answer
B
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)
View Answer
C
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
View Answer
D
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
View Answer
B
Q2808: As 'a' increases in the Ethernet efficiency formula, the efficiency of the network:
- A: Increases
- B: Decreases
- C: Remains constant
- D: Doubles
View Answer
B
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
View Answer
C
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
View Answer
D