ACL Implementation Considerations
ACLs can be a great tool to enhance the security of a network, but engineers should think about some broader issues before simply configuring an ACL to fix a problem. To help, Cisco makes the following general recommendations in the courses on which the CCNA exams are based:
Place extended ACLs as close as possible to the source of the packet to discard the packets quickly.
Place standard ACLs as close as possible ...
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