For those who attended the Data Communications and Networks course will find this chart very familar! This chart was created as a tool to quickly calculate subnet masking and IP addressing. This is also a very handy tool when working with VLSM (variable length subnet masking).
Subnetting -
This links to a subnetting chart a bit different from the one posted above but equally helpful.
http://networking.ringofsaturn.com/IP/subnets.php -
This subnetting example was found on the web (URL is attached).
This is an interesting site that you may want to take a little extra time to explore. You might want to bookmark this site for later reference as you continue your CCDA studies.
