Skip to content

Week 3 worksheet — Ethernet and switching

Name ID Date

1 - The MAC Table

Predict:

  1. Before any traffic, how many entries are in the bridge's table? _______
  2. After PC1 pings PC2, what does the bridge know (i.e. whose address is in its table)? _______
  3. Which packet taught the switch where PC2 is — PC1's request or PC2's reply? _______

Observe:

value
Entries before any traffic
Entries after PC1 → PC2
Which frame taught the switch about PC2
Port recorded for PC4 after moving it, before it transmits
Port after PC4 transmits

2 - Ethernet Broadcast

Observe:

value
Destination MAC of the flooded frame
Destination MAC of broadcast frame
What stopped the flooding
What stops a real broadcast

4 - VLAN

Observe:

Value
The 4 PCs VLAN ids
ARP broadcast from PC1 on PC3's cable, before / after VLAN
New field in bridge fdb show
Extra bytes in a tagged frame
What would be needed to connect VLAN 10 to VLAN 20