Velocity517 Posted May 9, 2007 Share Posted May 9, 2007 Ok so I'm trying to understand ACLs (Access Control Lists) and I just somehow can't get it. Especially the part about the wildcards. any help??? Link to comment Share on other sites More sharing options...
Sepiraph Posted May 10, 2007 Share Posted May 10, 2007 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: 0.0.0.0 Binary Version: 00000000.00000000.00000000.00000000 Meaning: Entire IP address must match Example 2 Wildcard Mask: 255.255.255.255 Binary Version: 11111111.11111111.11111111.11111111 Meaning: Automatically considered to match Example 3 Wildcard Mask: 0.0.0.15 Binary Version: 00000000.00000000.00000000.00001111 Meaning: First 28 bits must match Link to comment Share on other sites More sharing options...
Velocity517 Posted May 15, 2007 Author Share Posted May 15, 2007 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... Link to comment Share on other sites More sharing options...
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