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Module 4: ACL Concepts - Coggle Diagram
Module 4: ACL Concepts
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Wildcard Mask Overview
Is similar to a subnet mask in that it uses the ANDing process to identify which bits in an IPv4 address to match. However, they differ in the way they match binary 1s and 0s. Unlike a subnet mask, in which binary 1 is equal to a match and binary 0 is not a match, in a wildcard mask, the reverse is true.
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Types of IPv4 ACLs
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Extended ACLs - These permit or deny packets based on the source IPv4 address and destination IPv4 address, protocol type, source and destination TCP or UDP ports and more.
ACL
An ACL is a series of IOS commands that are used to filter packets based on information found in the packet header.
Uses a sequential list of permit or deny statements, known as access control entries (ACEs).
Packet filtering controls access to a network by analyzing the incoming and/or outgoing packets and forwarding them or discarding them based on given criteria
ACLs define the set of rules that give added control for packets that enter inbound interfaces, packets that relay through the router, and packets that exit outbound interfaces of the router.
