14.9.11 Packet - Tracer - Layer 2 Vlan Security

Port Security.

Take the time to run this lab. Break it on purpose. Watch the show port-security , show dhcp snooping binding , and show interfaces status err-disabled outputs.

On the access ports connecting to end devices (Fa0/1, Fa0/2, etc.), you need to lock down the MAC addresses. 14.9.11 packet tracer - layer 2 vlan security

Cisco’s Packet Tracer activity is an excellent, hands-on lab that forces you to think like both a network admin and a hacker. It focuses on three critical Layer 2 vulnerabilities and their mitigations: MAC Flooding , VLAN Hopping (Switch Spoofing) , and DHCP Starvation .

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. Port Security

Move the native VLAN to an unused, "dead-end" VLAN.

That’s where comes in. It’s the often-overlooked foundation of network defense. Watch the show port-security , show dhcp snooping

By default, switches are trusting. And trust, in security, is a vulnerability.