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Computer Networking/ACLs


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What part of it do you not understand? I have to know this stuff also since I'm taking the CCNA exam soon, are you by any chance planning to take as well?.


Regarding wildcard, ACL uses a wildcard mask to define the portion of the IP address that should be examined. The wildcard mask's 0 and 1 bit specify the matching logic: 0 bit in the wildcard corresponds to address bit that must be compared while 1 bit instructs the router that the corresponding address bit do not need to be compared.


As an example:


Wildcard Mask:

Binary Version: 00000000.00000000.00000000.00000000

Meaning: Entire IP address must match


Example 2


Wildcard Mask:

Binary Version: 11111111.11111111.11111111.11111111

Meaning: Automatically considered to match


Example 3


Wildcard Mask:

Binary Version: 00000000.00000000.00000000.00001111

Meaning: First 28 bits must match

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wow, thanks I actually get it now! And yeah, I'm in Comp. Network Engineering at my school, and I'm preparing to take the CCNA. Mostly I have trouble with the syntax of setting ACLs. such as in what order the terms go for a particlar ACL...

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