UGC NET Computer Science July 2018 - II Question 43

Question 43

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The dotted-decimal notation of the following IPV4 address in binary notation is _________.   10000001 00001011 00001011 11101111

Options:

1. (1) 111.56.45.239
2. (2) 129.11.10.238
3. (3) 129.11.11.239
4. (4) 111.56.11.239

Answer : (3) 129.11.11.239

Explanation Question 43

In below table we convert all 4 bytes IPV4 address to the dotted-decimal notation.

Bit position multiplication value(→)	128	64	32	16	8	4	2	1
4th byte	1	0	0	0	0	0	0	1	= (128*1 + 1*1) = 129
3rd byte	0	0	0	0	1	0	1	1	= (8*1+2*1+1*1) = 11
2nd byte	0	0	0	0	1	0	1	1	= (8*1+2*1+1*1) = 11
1st byte	1	1	1	0	1	1	1	1	= (128*1+64*1+32*1+8*1+4*1+2*1+1*1) = 239

Hence, IPv4 address in dotted-decimal notation is 129.11.11.239

So, option (3) is correct answer

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