14.9.11 Packet Tracer - Layer 2 Vlan Security – Verified

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).

In the world of networking, we often talk about firewalls, ACLs, and encryption. But what happens if an attacker simply unplugs a legitimate user’s laptop and plugs in a rogue device? What if they spoof a VLAN or launch a MAC flood? 14.9.11 packet tracer - layer 2 vlan security

interface range fa0/1-24 switchport mode access switchport nonegotiate On the actual trunk between switches: Never use VLAN 1 for anything

By default, switches are trusting. And trust, in security, is a vulnerability. Step 4: DHCP Snooping – Stopping the Rogue

Let’s break down what this lab teaches and why it matters in the real world. Imagine you are responsible for a corporate network. Users are in VLAN 10 (Employees) and VLAN 20 (Guests). The lab presents a simple topology: one multilayer switch (distribution), one layer 2 switch (access), and a few PCs.

DHCP Snooping.