Switchboard
Pick a moment. Guess what the switch does. Send the frame.
Browser Lab · Layer 2 only
The switch and its MAC table
HOST A
02:00:00:00:00:0A
Ready
HOST B
02:00:00:00:00:0B
Ready
HOST C
02:00:00:00:00:0C
Ready
NO CABLE
LINK DOWN
Excluded
MISSION L2-04Power
PORT 1
PORT 2
PORT 3
PORT 4
1 Learn source
2 Look up destination
3 Take action
MAC address table
| MAC address | Port | Age left |
|---|
No frame on the wire yet.
1. Pick a moment
The switch has no map yet. Choose what you think it will do, then send Host A's first frame to Host B.
Edit the frame
Nerd tip A switch learns only from the source MAC. It never learns a destination by looking it up. Linux bridges show the same table with bridge fdb show br br0.