CN-DOUBT

Question

A network that is 172.28.0.0 and would like to support 650 hosts per subnet.The subnet mask should we use is 255.255.____ and____?

Comments

255.255.252.0?

---

Yes...Can explain?

Answer 1

We need 650 hosts, implying that we'll need at least 10 bits for the hosts (since $2^{10} = 1024$ is the minimum power of $2$ which is greater than 650).

So, the last 10 bits will be reserved for the hosts and rest of it has to be 1s in the subnet mask. Therefore, the first 22 bits will be one and the next 10 will be zero.

Converting this into binary should give you $255.255.252.0$

Comments

@goxul and it will have 2^6 subnets?

---

Yes, it should have $2^6$ subnets, each having $1024$ hosts.