### Information

 Author(s) Olivier Bonaventure Deadline No deadline Submission limit No limitation Category tags Ethernet

## Comparing BPDUs

With the 802.1d protocol, Ethernet switches exchange BPDUs that contain four informations :

• the Root identifier
• the Cost to reach the root
• the Transmitter identifier

The third information contains two parts: the identifier of the switch that sent the BPDU and the identifier of the port where the BPDU has been sent. Each switch uses a unique identifier for each of its ports.

##### Which BPDUs are better
Select among the list below all the BPDUs that are better than [R=123,C=17,T=15.4]