would somebody tell me moere about wildcard masking.?

Answer 1

The use of wildcard masks is most prevalent when building Access Control Lists (ACLs) on Cisco routers. ACLs are filters and make use of wildcard masks to define the scope of the address filter. Although ACL wildcard masks are used with other protocols, we will concentrate on IP here.


a simple example. We may want to filter a sub-network 10.1.1.0 which has a Class C mask (24-bit) 255.255.255.0. The ACL will require the scope of the addresses to be defined by a wildcard mask which, in this example is 0.0.0.255. This means that the 'Don't care bits' are represented by binary 1's whilst the 'Do care bits' are represented by binary 0's. You will note that this is the exact opposite to subnet masks!

hope this helps

Answer 2

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