computer networks

Question

Which of the following statements is/are not true?

1.Router may be assigned with 2 (or) more IP Addresses

2.127.17.20.256 has 16 bits for network ID

3.20.10.30.63/27 is one of the valid IP addresses in 20.10.30.35/27 block

4.The number of subnets possible for a class B network with subnet mask 255.240.0.0 is 220

ans is 2 and 4 bt how

Answer 1

option 2. Bcoz IPA is not valid it is out of range (0-255) not (0-256)

Option 4 bcoz number of subnet possible = 2^4= 16

        now 4 is coming from subneting mask 255.240.0.0 here we see number of bits which indicate to identify subnet by last non zero number which is 240 here , now convert in to binary

        240=(11110000)2 ,  here number of bit = 4 who indicate subnet. so 2^4=16

Comments

127.17.20.256  in 4^th octet using 8 bits how 256 is possible?

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Yeah correct it's my fault.