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About Wildcard mask Logic in ACL - Cisco Learning Network The above access-list is permitting any network that matches the result of the ANDing of network 2 2 2 0 to its regular mask In order for us to do ANDing, we must get the regular mask; to get the regular mask, we can subtract 0 0 0 255 (The inverse-mask) from 255 255 255 255, which results to 255 255 255 0
Why is there an echo-reply in a ping, when an IP address is using a . . . I am wondering, why are are the hosts able to ping each other when the subnet masks are different? I was under the impression that, when subnet masks are different, the hosts are in their separate subnetworks, and therefore a router would be required to route packets for this communication Correct me if I am wrong, the first thing a PC does is compare its IP address to the destination IP