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Networking - Subnetting - Discussion

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"It takes a very long time to become young."
- Pablo Picasso
4. 

What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?

[A]. 14[B]. 15
[C]. 16[D]. 30

Answer: Option

Explanation:

A /27 (255.255.255.224) is 3 bits on and 5 bits off. This provides 8 subnets, each with 30 hosts. Does it matter if this mask is used with a Class A, B, or C network address? Not at all. The number of host bits would never change.


Nikhil said: (Sat, Feb 8, 2014 12:17:19 AM)    
 
255.255.255.224 i.e Binary of 255 is 11111111 and Binary number of 224 is 11100000.

Here 1 Represent On bit and 0 represents Off bit.
Then how to calculate Host Id.

See Here,

Formula Host Id = 2^off bit - 2 i.e 2^5 = 32 - 2 = 30.
And Net Id is = 2^on bit = 2^3 = 8.
That's why Answer is 30.

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