What Access List? What is standard ACL, extended ACL, named ACL, and what is routing protocol ACL?

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Access-List or ACL is a set of rules which will allow or deny the specific traffic moving through the router. ACL is defined as controlling network traffic and reducing network attacks. ACLs are used to filter traffic based on the set of rules defined for the IN to the router or OUT to the router of the network. An ACL would be your tool of choice for decision-making for example you can set them to allow certain hosts to access web resources on the internet while others are restricted.

Access-list is to filter unwanted packets when implementing security policies. ACL is a layer 3 security that controls the flow of traffic from one router to another. it is also called a packet-filtering firewall.

How access-list works.

The packet is always compared with each line of the access list in sequential order. This means the set of rules defined are matched serial wise i.e. matching starts with the first line of the access list, then move to 2nd line, then 3rd, and so on.

The packet is compared with lines of the given access list only until a match is made. Once it matches the condition on the line of the access list or rules are matched then no further comparison takes place and that rule will be performed.

There is an implicit deny at the end of each access list because if no condition or rules matches then the packet will be discarded.

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