With a single bit parityscheme, withevenparity, which bit string would be correct?

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

1. With a single bit parityscheme, with evenparity, which bit string would be correct?

1. 1110101011
2. 0110101011
3. 0110001011
4. 0110101010

2 . What is the advantage of two-dimensional bit parity?

1.  It can detect an error in a two-dimensional array.
2.  It can detect and correct three bit errors.
3.  It can detect and correct two bit errors.
4.  It can detect and correct a single bit error.

3. In any error checking scheme (pairity, CRC, checksum) which statement defines the correct description of a match and non-match?

1. Check matches: The data is likely correct, but there is a chance it is not based on the size of the checksum. Check does not match: The data is likely bad, but there is a chance it is correct based on the size of the checksum.
2. Check matches: The data must be correct. Check does not match: The data must not be correct.
3. Check matches: The data is likely correct, but there is a chance it is not based on the size of the checksum. Check does not match: The data must not be correct.
4. Check matches: The data must be correct. Check does not match: The data is likely bad, but there is a chance it is correct based on the size of the checksum.

4. what is the relationship between G, D and R in the CRC?

1. D can be any size, but G and R must match in length.
2. D must be an even multiple of G, and R must be smaller than G.
3. D can be any size, but G must be one larger than R.
4. D can be any size, but R must be longer than G.

5. Find the CRC remainder (R) for the following binary data (D) and generator (G) D = 10101010 G = 1001

1. 011
2. 101
3. 100
4. 000

6. What is the primary operation in CRC?

1. XOR
2. Multiply
3. Subtract
4. Add

   7. Which partitioning methods can not use all available bandwidth if some nodes do not use it?

1. TDMA
2. FDMA
3. Slotted ALOAH
4. CSMA

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