General Information
ACLs are used to control network traffic on Cisco routers and switches. They are used to filter traffic based on source and destination IP addresses, protocols, and ports. ACLs can be used to block unwanted traffic, allow only specific traffic, or shape traffic to meet specific requirements. They are often used in conjunction with other security features such as firewalls and VPNs to provide a comprehensive security solution for a network. ACLs can be applied to interfaces on a router or switch to control inbound or outbound traffic. They are processed in the order in which they are configured, and the first match is applied. This means that the most specific rules should be placed at the top of the ACL, and the more general rules should be placed at the bottom.
ACLs are used to control the flow of network traffic in three ways:
Below a brief comparison between standard and extended ACLs:
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