Subnetting

[carl_townshend]

Can anyone tell me in simple terms, what is subnetting and whats is it used for ?

thankyou

[amit-singh]

Hi,

Subnetting is giving the host bits to the network bits. It is used for dividing a major network in to smaller networks or subnet.

For example

192.168.1.0 255.255.255.0 is a class C address. You can have 254 hosts in this subnet.

If you want you can subnet this depending on what smaller host segments you want

like 255.255.255.128, 255.255.255.224 etc.

HTH,

-amit singh

[carl_townshend]

If you used 255.255.255.128, what would this achieve ?

[amit-singh]

You have subnetted 255.255.255.0 or /24 to /25 and you can have 126 hosts in the new subnet. Remember I told you its giving host bit to network bit.

regards,

-amit singh

[carl_townshend]

Does this mean the other hosts in this subnet are wasted ? i.e you say you can have 126 hosts in the 255.255.255.128 subnet. how would I use the rest of the hosts i.e 129 to 254 ?

[Kevin Dorrell]

The mask splits the network 192.168.1 into two separate parts called subnets.

Subnet 192.168.1.0 has hosts 1 to 126. Address .0 is the base of the subnet, and .127 is the subnet broadcast address.

Subnet 192.168.1.128 has hosts 129 to 254. Address .128 is the base of the subnet, and .255 is the subnet broadcast address.

Kevin Dorrell

Luxembourg

[amit-singh]

http://www.cisco.com/cgi-bin/Support/IpSubnet/subnets.pl

Please use the above handy tool.

regards,

-amit singh

[dilanperera2]

Subnetting is the process of subdividing a given network address to smaller sub networks. In order to create sub networks, we borrow bits from the host portion of a given network address.

https://ippacket.com.au/lesson/subnetting/