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TOPIC: Wildcard mask practice

Wildcard mask practice 9 years 3 months ago #29455

  • msarro
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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.

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Re: Wildcard mask practice 9 years 3 months ago #29456

  • Smurf
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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

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Wayne Murphy
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Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.

Re: Wildcard mask practice 9 years 3 months ago #29457

  • msarro
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I'm looking for like, pdf worksheets for advanced wildcard masks :)

things like...
0.0.0.5, etc

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Re: Wildcard mask practice 9 years 3 months ago #29464

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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

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Wayne Murphy
Firewall.cx Team Member
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Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.

Re: Wildcard mask practice 9 years 3 months ago #29467

  • S0lo
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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.

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Studying CCNP...

Ammar Muqaddas
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Re: Wildcard mask practice 9 years 3 months ago #29470

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