Many attacks on a LAN happen at Layer 2, from a device plugged into an access port: flooding the switch's MAC (media access control) address table, running a rogue DHCP (Dynamic Host Configuration Protocol) server, or poisoning ARP (Address Resolution Protocol) caches to intercept traffic. Cisco switches offer three features that work together to detect and prevent these attacks at the edge. The CCNA tests how each works, its defaults, and how they depend on one another.
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