sub net

[E_G_R2]

OK I know how to subnet but is there an easy way to answer this question in exam situation (I will provide the answer so that you don't think I'm after one)

 

Q. Class B IPv4 network 150.150.0.0 create a subnet mask for 600 subnets

A. 255.255.255.192 = 64 hosts 62 usable

 

Q Identify the 312th subnet (where subnet 0 is used)

A. 150.150.78.0

 

Is there a quick method of calculating the 312th subnet, I did it by long hand but in an exam you don't have the time

 

Cheers

[ollyyllo]

By long hand do you mean convert to binary and back?

312 = 100111000

split along the last two digits 01001110.00000000

01001110 = 78

00000000 = 0

 

It would be useful to know a quicker way

[E_G_R2]

By long hand do you mean convert to binary and back?

312 = 100111000

split along the last two digits 01001110.00000000

01001110 = 78

00000000 = 0

 

It would be useful to know a quicker way

 

No that will do me, i'd obviously forgotten that method

[ollyyllo]

I dont even know if that is a proper method, its just what I always do, I find it easier to visualise the binary first.