class b subnet mask for support 30 networks

Question

Comments

30 networks => 5 bits can be taken from host id part which is of 16 bits .

255.255.248.0

Answer 1

To support 30 networks we need atleast 5 bits(2^5=32).

And default subnet mask for class B network is 255.255.0.0

so we will borrow the most significant 5 bits from the third octet to support our 30 subnet networks that is

255.255.11111000.00000

i.e; 255.255.248.0

and the rest bits(represented as 0) will be host part......

Correct me If I'm wrong......:-)

Comments

Thank a lot