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Their IP and MAC addresses are shown in parentheses for example, Host HA uses IP address IA and MAC address MA. Hosts HA, HB, and HC are connected to the switch on interfaces A, B and C, all of which are on the same subnet. For example, a malicious user might intercept traffic intended for other hosts on the subnet by poisoning the ARP caches of systems connected to the subnet. You can attack hosts, switches, and routers connected to your Layer 2 network by вЂњpoisoningвЂќ their ARP caches. Relative Priority of Static Bindings and DHCP Snooping Entries.Interface Trust state, Security Coverage and Network Configuration.This section contains the following subsections: This capability protects the network from certain вЂњman-in-the-middleвЂќ attacks. DAI allows a network administrator to intercept, log, and discard ARP packets with invalid MAC address to IP address bindings.

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Note For complete syntax and usage information for the switch commands used in this chapter, refer to the Catalyst 4500 Series Switch Cisco IOS Command Reference and related publications atДynamic ARP Inspection (DAI) is a security feature that validates Address Resolution Protocol (ARP) packets in a network. This chapter includes the following major sections:

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This chapter describes how to configure Dynamic ARP Inspection (DAI) on the Catalyst 4500 series switch. Understanding and Configuring Dynamic ARP Inspection

Configuring NetFlow Statistics Collection.

Port Unicast and Multicast Flood Blocking.

Understanding and Configuring Dynamic ARP Inspection.

Configuring DHCP Snooping and IP Source Guard.

Understanding and Configuring 802.1X Port-Based Authentication.

Understanding and Configuring IP Multicast.

Configuring 802.1Q and Layer 2 Protocol Tunneling.

Configuring IGMP Snooping and Filtering.

Understanding and Configuring EtherChannel.

Understanding and Configuring Multiple Spanning Trees.

Configuring Layer 2 Ethernet Interfaces.

Environmental Monitoring and Power Management.

Configuring Supervisor Engine Redundancy using RPR and SSO.

Configuring the Switch for the First Time.