14.9.11 Packet Tracer - Layer 2 Vlan Security May 2026

interface range fa0/1-24 switchport mode access switchport nonegotiate On the actual trunk between switches:

That’s where comes in. It’s the often-overlooked foundation of network defense. 14.9.11 packet tracer - layer 2 vlan security

Never use VLAN 1 for anything. Not for native VLAN, not for management, not for users. VLAN 1 is the universal key to many Layer 2 attacks. Step 4: DHCP Snooping – Stopping the Rogue Server The Threat: An attacker plugs in a laptop running a rogue DHCP server. When legitimate clients broadcast for an IP, the rogue server replies first, giving them a malicious gateway (the attacker) or a bogus DNS server (phishing). not for management