ACE-BOOKLET-VOL2-Level1-Chanpter5 ( Page #49 Question#9 )

Question

Find Host Address  from the following
Given IP: 200.34.22.156 
Mask : 255.255.255.240

Answer is given as
IP and complemented MASK gives host ID 200.34.22.12
My Approach
I have never seen anything like complementing MASK address to obtain HOST address.
Host ID ranges from 200.34.22.145 to 200.34.22.158 and  200.34.22.12  Host does not belong this range
So  HOST Address has to be  200.34.22.156  Given IP itself. 

Answer 1

yse complementing mask or-ing with ip will give the host address...

 

just check

1.complement the mask---0    .0  .0 .   00001111

2. ip-------------------------------200.34 .22.  10011100

3. perform or operation

4.ans---------------------------200.34.22.12(which is host id)

Comments

What is the difference in HOST ID and Host Address ? I didn't get you what are you saying ?

According to Wikipedia
In network addressing, the host address, or the host ID portion of an IP address, is the portion of the address used to identify hosts (any device requiring a Network Interface Card, such as a PC or networked printer) on the network.

According to my knowledge Host ID and Host address are one at the same .

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No, i meant to say , just to clarify you, that host address is the 200.34.2.156 which is the 12th host

in the  subnet 200.34.12.144 ...thats it...

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Ok. Got it Now . Thank you .
156-144 = 12
200.34.2.156 is the 12th Host. Got it