DHCP Snooping + Dynamic ARP Inspection Lab — CCNA 200-301 | Cisco Packet Tracer

Practice this free, no login: https://packetmentor.com/topics/dynam... ARP has no authentication — so any host can claim to be your gateway and quietly man-in-the-middle the network. We stop it the Cisco way: DHCP snooping builds a trusted MAC↔IP binding table, then Dynamic ARP Inspection uses it to drop forged ARP replies. Configure it, launch the attack, watch DAI kill it. Full written guide: https://packetmentor.com/blog/layer-2... ⏱️ Chapters 0:00 Demonstrating the ARP Man-in-the-Middle (MITM) attack. 2:54 Understanding the lab layout and switch roles. 4:02 Setting Trust boundaries (Preventing the #1 common mistake). 4:50 Access port and Vlan configurations on switch - A quick recap 6:04 Verificaiton of base configurations 6:40 The attacker (Illegitimate DHCP Server) 9:04 DHCP snooping — the binding table 10:18 Setting Trust boundaries (Preventing the #1 common mistake). 10:59 Ensuring the binding table is populated correctly. 12:00 Why DHCP snooping alone isn't enough (The attack persists). 13:50 Enabling Dynamic ARP Inspection to drop forged traffic. 15:12 Handling static IPs using ARP Access Control Lists (ACLs). 16:19 Testing, monitoring, and validating the security policy. More free labs & simulators: https://packetmentor.com/practice/