Subnetting Review

When you are creating subnets,you must determine the optimal number of subnets and host.
To identify subnets, you will "borrow" bits from host ID portion of the IP address:

The number of subnets available depends on the number of bits borrowed.

• The available nmber of subnets =2s, I which s is the number of bits borrowed.

The number of hosts per subnet available depends upon yhe number of host ID bits not borrowed.

• The available number of hosts per subnet=2h-2, in which h is the number of host bits not borrowed.
• One address is reserved as the network address.
• One address is reserved as the broadcast address.