Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 146
Q2121:
Fill in the blank: In checksum, overflow bits are usually ______.
A. dropped
B. counted twice
C. added back into the sum
D. stored separately
Correct Answer:
C
Chapter: 146
Q2122:
What is the key limitation of checksum technique?
A. Complexity
B. Does not detect all error types
C. Slow speed
D. Requires special hardware
Correct Answer:
B
Chapter: 146
Q2123:
What does checksum rely on to detect changes in message content?
A. Data routing
B. IP configuration
C. Summing known values
D. Encryption technique
Correct Answer:
C
Chapter: 147
Q2124:
What is the main drawback of retransmission in real-time multimedia?
A. It increases video quality
B. It is slow and causes delays
C. It reduces error detection
D. It increases redundancy
Correct Answer:
B
Chapter: 147
Q2125:
Fill in the blank: In real-time multimedia, errors must be ______.
A. reported
B. retransmitted
C. ignored
D. corrected or reproduced
Correct Answer:
D
Chapter: 147
Q2126:
Which method is commonly used instead of retransmission in real-time applications?
A. Cyclic Redundancy Check
B. Forward Error Correction
C. Simple parity check
D. Back error detection
Correct Answer:
B
Chapter: 147
Q2127:
What does "Forward Error Correction" primarily focus on?
A. Re-sending packets
B. Correcting errors at receiver end
C. Encrypting data
D. Compressing packets
Correct Answer:
B
Chapter: 147
Q2128:
Fill in the blank: Forward Error Correction techniques send ______ along with original data.
A. retransmission requests
B. error requests
C. redundant bits
D. encryption keys
Correct Answer:
C
Chapter: 147
Q2129:
Which of the following techniques is used to **avoid** retransmission?
A. Automatic Repeat reQuest (ARQ)
B. Simple parity
C. Forward Error Correction
D. Cyclic code
Correct Answer:
C
Chapter: 147
Q2130:
What mathematical concept is used in Forward Error Correction?
A. Binary trees
B. Hamming Distance
C. Frequency analysis
D. IP routing
Correct Answer:
B
Chapter: 147
Q2131:
To correct 10-bit errors in a packet, what should be the minimum Hamming distance?
A. 11
B. 20
C. 21
D. 10
Correct Answer:
C
Chapter: 147
Q2132:
Fill in the blank: To correct ‘t’ errors, the required minimum Hamming distance is ______.
A. d = t
B. d = 2t
C. d = t + 1
D. d = 2t + 1
Correct Answer:
D
Chapter: 147
Q2133:
What does the minimum Hamming distance represent in coding theory?
A. Shortest code length
B. Redundancy measure
C. Number of bits in one symbol
D. Minimum difference between valid codewords
Correct Answer:
D
Chapter: 147
Q2134:
How many redundant bits are needed as the required Hamming distance increases?
A. Fewer bits
B. More bits
C. Same bits
D. No bits needed
Correct Answer:
B
Chapter: 147
Q2135:
Which of the following is TRUE about error correction in real-time systems?
A. It relies on retransmission
B. It ignores errors
C. It uses Hamming Distance to detect and correct errors
D. It uses parity only
Correct Answer:
C
Chapter: 147
Q2136:
Fill in the blank: Hamming distance helps in ______.
A. error propagation
B. error correction
C. packet switching
D. encryption
Correct Answer:
B
Chapter: 147
Q2137:
What is the equation used to determine the minimum distance for error correction?
A. d = t + 1
B. d = 2t + 1
C. d = 3t
D. d = t * 2
Correct Answer:
B
Chapter: 147
Q2138:
What happens when the minimum Hamming distance is insufficient?
A. Errors go undetected
B. Transmission speed increases
C. Data size reduces
D. Redundancy increases
Correct Answer:
A
Chapter: 147
Q2139:
In FEC, if dmin = 2t + 1, what does "t" represent?
A. Packet length
B. Number of redundant bits
C. Number of errors that can be corrected
D. Codeword length
Correct Answer:
C
Chapter: 147
Q2140:
What is the benefit of using a high Hamming distance in coding?
A. Reduced bandwidth
B. Faster transmission
C. More errors can be corrected
D. Less data transmitted
Correct Answer:
C