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Access Control List (7.1.1Purpose of ACLs (7.1.1.3 ACLs operation (Inbound…
Access Control List
7.1.1Purpose of ACLs
7.1.1.1 What is ACLs ?
An ACL is a series of IOS commands that control whether a router forwards or drops packets based on information found in the packet header. ACLs are among the most commonly used features of Cisco IOS software.
7.1.1.2 Packet Filtering
Packet filtering controls access to a network by analyzing the incoming and outgoing packets and forwarding them or discarding them based on given criteria.
7.1.1.3 ACLs operation
Inbound ACLs - Incoming packets are processed before they are routed to the outbound interface. An inbound ACL is efficient because it saves the overhead of routing lookups if the packet is discarded
Outbound ACLs - Incoming packets are routed to the outbound interface, and then they are processed through the outbound ACL. Outbound ACLs are best used when the same filter will be applied to packets coming from multiple inbound interfaces before exiting the same outbound interface.
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