GATE CSE 2015 Set 3 | Question: 38

Question

In the network $200.10.11.144/27$, the $\text{fourth}$ octet (in decimal) of the last $\text{IP}$ address of the network which can be assigned to a host is _______.

Comments

What is meant by fourth octet ?

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@hem chandra joshi ji

fourth octet (in decimal) of the last IP address of the network means

__ __ __ __ __ __ __ __($1^{st}$ octet) . __ __ __ __ __ __ __ __($2^{nd}$ octet) . __ __ __ __ __ __ __ __ ($3^{rd}$ octet). X X X X X X X X ($4^{th}$ octet)

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Remark:

The address with all 1s in host part is broadcast address

The address with all 0s in host part is network address

Answer 1

The below image explains why 158 should be answer.

As last and first value cant be used to assign to a host

we always assign $2^{hid}$-2 

 

The last bit is 0 as if it were 1, it would have been directed broadcast address of the Network