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Component 04 · L2

Layer 2 Switches

Interactive revision playbook. Read one slide at a time, move forward or back for review, and replay the component before continuing.

Playbook status
In progress
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01 · Start here

What makes a switch a Layer-2 device?

A Layer-2 switch forwards Ethernet frames using MAC addresses and VLAN context. It provides connectivity within broadcast domains while maintaining forwarding state.

Frame
→
MAC lookup
→
Port
Engineer takeaway

Layer-2 switching is frame forwarding, not IP routing.

Learning sequence

Review this playbook as often as needed before moving to the next component.

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