What you would learn in Most Complete Teaching of Access Control List (ACL) course?
Cisco ACLs are distinguished by one or multi-permit/deny statements. They are used to filter the outbound or inbound packets that are sent to an identified network interface. The needs use many ACL types, and two ACLs are allowed on the Cisco connection per protocol. For instance, an IP ACL is applied inbound, and a single IP ACL is used outbound.
Cisco's best methods for creating and implementing ACLs
Apply an extended ACL near the source
Apply standard ACL near the destination
Order ACL and have multiple statements, ranging from very specific to less specific.
A maximum of two ACLs can be used on a Cisco internet interface.
One ACL can be used either outbound or inbound according to the layer three protocol.
Some suggested best practices exist for creating and implementing Access Control Lists (ACLs). The network administrator should use the standard ACL close to its destination. The introductory ACL statement comprises an IP address for the source and a wildcard mask. A familiar name or number allows multiple statements to be assigned for the same ACL.
Standard ACLs are an older version and highly general, and this means that they could accidentally filter traffic in a way that is not correct. Applying the standard ACL close to the destination is suggested to avoid over-filtering, and the extended ACL is best applied closer to where the origin is. Extended ACLs are very granular (specific) and provide additional options for filtering. They can filter addresses for the source, destination ports, and protocols. Applying extended ACLs closest to the source stops the flow of traffic that must be restricted from entering the network. This reduces bandwidth and the processing needed at every router hop from the source to the destination's ends.
Specific access control lists consist of several statements. The order in which statements are placed is essential in ACL processing. The router begins at the top (first) and then cycles through every statement until a match statement is discovered. The packet is deleted when there is no match—the order of ACL statements from the most specific to the least specific. The assignment of the minor specific statements could cause a false match, which means that the match for the ACL statement is never achieved.
- Standard Access Control List [ACLStandard Access Control List [ACL
- Advanced Access Control List [ACLExtended Access Control List [ACL
- Port ACL [PACL]
- VLAN ACL [VACLVLAN ACL [VACL
- PACL , VACL and RACL Interaction
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