Can someone help me answer this You have an IP address of 156.233.40.6 with a su

Question

Can someone help me answer this

You have an IP address of 156.233.40.6 with a subnet mask of /23. How many hosts and subnets are possible in this network? The administrator does not use routers and does not change subnet mask any further. Do not consider IP address class. Show how you got your answers.

The number of host computers:

The number of subnets:

You have an IP address network in class C. Now, you divide the network into 3 subnets. And, you will add more 2 subnets in the next year.

Planning for 5 years, what subnet mask should you use? Use the format like /xx.

Planning for 5 years, how many IP address are available in each subnet?

Explanation / Answer

part one)

We have /23 subnet mask,

So available number of subnets will be ( assuming classless system) = 223-2 = 8388608 - 2 = 8388606.

There will be 32 - 23 = 9 bits available for hosts.

So available number of hosts will be = 29-2 = 512 - 2 = 510.

part two)

We have a class C IP address network, to divide it into 3 subnets we should have x bits for subnet such that 2x - 2 >= 3. Taking x = 3 satisfies above mentioned condition. So subnet mask will be 24+3 = /27.

If we want two more subnets after one year we shuold have 2x - 2 >= 5. Here also x = 3 satisfies the condition so we can have the same subnet mask as before.

Number of bits available for hosts = 32 - 27 = 5.

Number of IP address available in each subnet = 25 = 32. ( minus 2 will give the number of available hosts)

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