Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. Checksums use _________ arithmetic.
A) one’s complement arithmetic
B) two’s complement arithmetic
C) either (a) or (b)
D) none of the above
Answer: Option A
Solution:
2. The checksum of 1111 and 1111 is _________.
A) 0000
B) 1111
C) 1110
D) 0111
Answer: Option A
Solution:
3. In modulo-11 arithmetic, we use only the integers in the range ______, inclusive.
A) 1 to 10
B) 0 to 10
C) 1 to 11
D) none of the above
Answer: Option B
Solution:
4. In cyclic redundancy checking, the divisor is _______ the CRC.
A) one bit less than
B) one bit more than
C) The same size as
D) none of the above
Answer: Option B
Solution:
5. The ________ between two words is the number of differences between corresponding bits.
A) Hamming rule
B) Hamming code
C) Hamming distance
D) none of the above
Answer: Option C
Solution:
6. The _______ of a polynomial is the highest power in the polynomial.
A) range
B) power
C) degree
D) none of the above
Answer: Option C
Solution:
7. In modulo-2 arithmetic, __________ give the same results.
A) addition and subtraction
B) addition and multiplication
C) addition and division
D) none of the above
Answer: Option A
Solution:
8. In cyclic redundancy checking, what is the CRC?
A) The quotient
B) The dividend
C) The divisor
D) The remainder
Answer: Option D
Solution:
9. Which error detection method consists of just one redundant bit per data unit?
A) CRC
B) Checksum
C) Simple parity check
D) Two-dimensional parity check
Answer: Option C
Solution:
10. In _____ coding, we divide our message into blocks, each of k bits, called ___.
A) block; blockwords
B) block; datawords
C) linear; datawords
D) none of the above
Answer: Option B
Solution:
11. A _____ error means that two or more bits in the data unit have changed.
A) burst
B) double-bit
C) single-bit
D) none of the above
Answer: Option A
Solution:
12. Adding 1 and 1 in modulo-2 arithmetic results in _________.
A) 0
B) 1
C) 2
D) none of the above
Answer: Option A
Solution:
13. In ________ error correction, the receiver corrects errors without requesting retransmission.
A) onward
B) forward
C) backward
D) none of the above
Answer: Option B
Solution:
14. If the Hamming distance between a dataword and the corresponding codeword is three, there are _____ bits in error.
A) 5
B) 4
C) 3
D) none of the above
Answer: Option C
Solution:
15. A simple parity-check code can detect __________ errors.
A) an odd-number of
B) an even-number of
C) two
D) no errors
Answer: Option A
Solution:
16. The Hamming distance between equal codewords is _________.
A) 0
B) 1
C) n
D) none of the above
Answer: Option A
Solution:
17. In a linear block code, the _______ of any two valid codewords creates another valid codeword.
A) ANDing
B) XORing
C) ORing
D) none of the above
Answer: Option B
Solution:
18. In ________ error correction, the receiver asks the sender to send the data again.
A) forward
B) backward
C) retransmission
D) none of the above
Answer: Option C
Solution:
19. We can divide coding schemes into two broad categories: ________ and ______coding.
A) linear; nonlinear
B) block; convolution
C) block; linear
D) none of the above
Answer: Option B
Solution:
20. In modulo-2 arithmetic, we use only ______.
A) 1 and 2
B) 0 and 1
C) 0 and 2
D) none of the above
Answer: Option B
Solution:
21. To guarantee correction of up to 5 errors in all cases, the minimum Hamming distance in a block code must be ________.
A) 11
B) 6
C) 5
D) none of the above
Answer: Option A
Solution:
22. The _____of errors is more difficult than the ______.
A) detection; correction
B) correction; detection
C) creation; correction
D) creation; detection
Answer: Option B
Solution:
23. In block coding, if k = 2 and n = 3, we have _______ invalid codewords.
A) 4
B) 8
C) 2
D) none of the above
Answer: Option A
Solution:
24. The checksum of 0000 and 0000 is __________.
A) 0000
B) 1111
C) 0111
D) 1110
Answer: Option B
Solution:
25. In one’s complement arithmetic, if positive 7 is 0111, then negative 7 is ________.
A) 1101
B) 1000
C) 1111
D) none of the above
Answer: Option B
Solution:
26. In block coding, if n = 5, the maximum Hamming distance between two codewords is ________.
A) 5
B) 3
C) 2
D) none of the above
Answer: Option A
Solution:
27. Which error detection method uses one’s complement arithmetic?
A) Checksum
B) CRC
C) Simple parity check
D) Two-dimensional parity check
Answer: Option A
Solution:
28. The divisor in a cyclic code is normally called the _________.
A) redundancy
B) degree
C) generator
D) none of the above
Answer: Option C
Solution:
29. In modulo-2 arithmetic, we use the ______ operation for both addition and subtraction.
A) OR
B) XOR
C) AND
D) none of the above
Answer: Option B
Solution:
30. We add r redundant bits to each block to make the length n = k + r. The resulting n-bit blocks are called _________.
A) codewords
B) datawords
C) blockwords
D) none of the above
Answer: Option A
Solution:
31. To guarantee the detection of up to 5 errors in all cases, the minimum Hamming distance in a block code must be _______.
A) 11
B) 5
C) 6
D) none of the above
Answer: Option C
Solution:
32. A generator that contains a factor of ____ can detect all odd-numbered errors.
A) x
B) 1
C) x + 1
D) none of the above
Answer: Option C
Solution:
33. _______codes are special linear block codes with one extra property. If a codeword is rotated, the result is another codeword.
A) Convolution
B) Cyclic
C) Non-linear
D) none of the above
Answer: Option B
Solution:
34. The Hamming distance between 100 and 001 is ________.
A) 0
B) 1
C) 2
D) none of the above
Answer: Option C
Solution:
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Complete List of Chapter Quiz in Data Communications and Networking
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