Computer Science - Networking - Discussion

You have a network ID of 134.57.0.0 and you need to divide it into multiple subnets in which at least 600 host IDs for each subnet are available. You desire to have the largest amount of subnets available. Which subnet mask should you assign?

IP belongs to class B. So 255.255.0.0 mask and for that 16 bits.

Remaining bits are 16 out of 16, and now we want 600 host per subnet for that we required 10 bit for host.

So, mask becomes 1111 1111.1111 1111.1111 1100.0000 0000 for subnet 134.57.252.0. is a correct answer.

255.255.255.252 will be the answer.

10 bits would be in host part.

But guys I have a doubt the method which you are using is for the given subnets not for the given hosts.

In question, there is 600 hosts, not 600 subnet.

Anyone, please clarify this.

According to me, the correct answer will be 255.255.252.0.

Given IP belongs to class B.

we need 600 host...means >2^9(greater than 512).

Hence we need at least 10 bit.but in option C
255.255.255.0

Binary form 11111111.11111111.11111111.00000000

we have only 8 bit(zero's which define No. of Host).so it will give 254(256-2)per host.

correct answer C.
as 255.255.248.0

Binary Form 11111111.11111111.11111000.00000000

So we have 11 bit (2^11-2=2046) or 2046 per subnet(total subnet=32=2^5).

You have a network ID of 134.57.0.0 and you need to divide it into multiple subnets in which at least 600 host IDs for each subnet are available. You desire to have the largest amount of subnets available. Which subnet mask should you assign?

IP belongs to class B so 255.255.0.0 mask and for that 16 bits.

remaining bits are 16 out of 16, and now we want 600 host per subnet for that we required 10 bit for host.

So, mask becomes 1111 1111.1111 1111.1111 1100.0000 0000 for subnet
134.57.252.0.

@Chetana Tailor.

This subnet mask is not given in the options, Why is it mistake in the given options?

The answer is wrong because at least 600 hosts mean we need more than 9 bits that are 10 bit. So the subnet should be 255.255.252.0 and less than 252. So if we go with the option than maximum subnet option will be C that is 248.

The correct answer is 255.255.252.0.

But it is not in the given options.

255.255.252.0 is correct as 10 bits for required host.