UGC NET CSE | December 2006 | Part 2 | Question: 29

Question

The subnet mask $255.255.255.192$

• A. Extends the network portion to 16 bits

• B. Extends the network portion to 26 bits

• C. Extends the network portion to 36 bits

• D. Has no effect on the network portion of an IP address

Answer 1

The subnet mask 255. 255. 255. 192 in binary is 

11111111   11111111 11111111 11 000000

first 26 1's tells the network potion  and last 6  0's  host id part

so B is the ans

 

 

 

 

 

 

Answer 2

2^6 is host id present on given sm so total number of host id is 6,nd we no IP is 32 bit so network id = ip-hostid

32-6=26 ans