Nt1310 Unit 1 Lab Report

Words: 466
Pages: 2

Subnet Mask :

To create the subnet mask, first remember that the purpose of the subnet mask is to separate the (32 bit) ip address into the network prefix and the host number. If a bit in the subnet mask is 1, the corresponding bit in the IP address is part of the network address; if the bit in the subnet mask is 0, the corresponding bit in the IP address is part of the host address.

First depict the ip address in binary. Take 192.168.100.0 and convert to binary:

ip address: 11000000.10101000.01100100.00000000

First we determine what class of address it is:

If the first bit is 0 it is a Class A address If the first two bits are 10 it is a Class B address If the first three bits are 110 it is a Class C address
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The default subnet mask for a Class C address is:

subnet mask: 11111111.11111111.11111111.00000000

The formula for figuring out the number of 'host' bits in a subnet mask is

2^n=(number of nodes ) (2^n means '2' to the power of 'n')

Since you know the number of nodes, you need to find 'n'.

Because we want 1024 node(s) (500+200+200 = 900 so nearest 2^n is 1024), we want to leave 10 - '0' bits in the subnet mask since 1024 = 2 ^ 10.
This will give you the following subnet mask:

subnet mask: 11111111.11111111.11111100.00000000

Which is referred to as /22 or in dotted decimal notation as 255.255.252.0

The number of 'network' bits in the subnet mask is less than the default for the Class. Therefore, this subnet mask will produce a