Match the security feature to its main purpose.

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How to think about this question

Access Control Lists (ACLs) are fundamental Cisco security tools that filter network traffic by permitting or denying packets based on defined criteria such as source/destination IP addresses, protocols, or ports. ACLs operate at Layer 3 and Layer 4 to enforce security policies and control access to network resources. They are widely used to restrict unauthorized traffic but do not inherently protect against DHCP or ARP spoofing attacks. DHCP Snooping is a Layer 2 security feature that prevents rogue DHCP servers from distributing invalid IP addresses. It works by filtering DHCP messages and building a DHCP binding table that records legitimate IP-to-MAC address mappings. This binding table is critical because other features, like Dynamic ARP Inspection (DAI), rely on it to validate ARP packets. DAI intercepts ARP requests and replies, comparing them against the DHCP Snooping binding table to prevent ARP spoofing and man-in-the-middle attacks. Port Security is another Layer 2 feature that limits the number of MAC addresses allowed on a switch port. It helps prevent unauthorized devices from connecting to the network by restricting port access based on MAC addresses. Unlike DHCP Snooping and DAI, Port Security does not validate DHCP or ARP traffic but focuses on controlling physical access to the network. Understanding these distinct roles is essential for correctly matching security features to their purposes in Cisco network environments.

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