Anyone no of any good sites that can help learn how to do subnet masking

[Renob]

Or point me to a good site??? Im takeing a CCNA class and was LOST to day, we just started to learn subnet masking..
I can do Class D address but get comfused when trying class B thats when you get into the 3 octet..
Thanks for the help

 

[L3Guy]

I learned that one in the school of hard knocks,
but I may be able to answer something more specific
Hopefully, someone else here knows of a resource.

Doug

 

[spidey07]

Try this.

http://www.boson.com/promo/guides/IP-Summary.PDF

 

[mobly99]

3com has a good discussion of IP addressing, subnetting, VLSM, route aggregation -etc Understanding IP Addressing: Everything You Ever Wanted To Know - By Chuck Semeria

and then there is always http://www.learntosubnet.com