ccna - subnetting

  noddy2121 09:05 01 Nov 2005
Locked

Hi

I am currently studying for ccna 2. I am doing a lot of subnetting practice, and there is always one thing that keeps slipping my mind.

Look at this network address below

11.0.8.1

In the second octet it is a zero, can zeros be used or not? or does my first range of subnets have to be one instead? like below

11.1.8.1

any help please

cheers

Wayne

  mgmcc 12:37 01 Nov 2005

Yes zeros can be used. The most commonly used LAN subnet is 192.168.0.x with a mask of 255.255.255.0 which gives addresses from 192.168.0.1 to 192.168.0.254, so that contains a zero octet.

Change the mask to 255.255.0.0 and you have a subnet from 192.168.0.1 to 192.168.254.254

At one time I ran my LAN with all addresses in the 10.0.0.x range and subnet mask 255.0.0.0 so, theoretically the subnet's address range was 10.0.0.1 to 10.254.254.254

  Gaz 25 12:46 01 Nov 2005

My IP addressing at home is 192.168.1.0 - 255.255.255.192 for network one.

For my other network, which is seperated by routers. It is 192.168.8.0 - 255.255.255.254 (only need a few addresses, and it's redirected, VLANed and NAT'ed from the main network for security.

;-)

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