ACLs on routers slow throughput of a heavily used system resource. List two advantages of using ACLs. List a situation in which you might want to block (reject) certain traffic through an ACL on a router; that is, a situation in which the performance penalty would not be the deciding factor.
What will be an ideal response?
Limit traffic for a closed community. (b) Block specific known attackers’ addresses (e.g., single-?point denial of service).
The real issue is number. Each ACL increases the work of the router, so whereas the penalty of one ACL might be tolerable,2 or 3 or 10 could be intolerable. After allowing one ACL, it is difficult to deny the second, and so on.
Rejecting all traffic from a location could be useful for blocking an attacker from a known address, such as a denial-?of-?service attack from a single point.
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