Wildcard mask practice

Just curious if anyone knows of any printable worksheets for wildcard masking? I know that there are a ton out there on the internets for subnetting, but sadly I don't have an issue with subnetting, lol.

Not sure what you are asking ? Is it given a subnet, whats the wildcard mask ?

Subnet 255.255.252.0
Inverse Mask 0.0.3.255

If so, then you just subtract 255 from each octect in the mask.

e.g.

255 - 255 = 0
255 - 255 = 0
255 - 252 = 3
255 - 0 = 255

Cheers

I'm looking for like, pdf worksheets for advanced wildcard masks

things like...
0.0.0.5, etc

Dont know of anything. The basic principle is the same though (the maths). "255 - the inverse masks gets you to the proper subnet".

In your case, 0.0.0.5

255 - 0 = 255
255 - 0 = 255
255 - 0 = 255
255 - 5 = 250

255.255.255.250 (not a valid subnet) but 0.0.0.7

255 - 0 = 255
255 - 0 = 255
255 - 0 = 255
255 - 7 = 248

255.255.255.248 is a valid subnet.

Cheers

Wayne

Wildcards topics are usually bound to "Access Lists" and "OSPF areas" topics. So you better search for keywords relating to that to find some thing useful. For a starter these might help:

www.cisco.com/warp/public/707/confaccesslists.pdf
www.routeralley.com/ra/docs/access_lists.pdf

There is also an online preview book on ACLs
books.google.com/books?id=P3aE0pgSFfcC&a..._summary_r&cad=0

I know you didn't ask for ACLs but thats just the way it is, Wildcards are usually described within.

Check this out: packetlife.net/static/cheatsheets/subnetting.pdf