Browser Lab · Ethernet Switching

Switchboard

Inject a raw Ethernet frame. Predict whether the switch floods, forwards, or filters it.

Layer 2 only. No IP. No routing.

Beginner · No terminal · Guided scenarios + free sandbox

Step 1: choose a starting state

Guided scenarios

Free sandbox

Step 2: inspect or edit the frame
Step 3: predict Flood, Forward, or Filter

Step 4: send it

Step 5: watch the switch act
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 addressPortAge left
No frame on the wire yet.
Step 6: read why

The switch has no map yet. Choose what you think it will do, then send Host A's first frame to Host B.