A consultant has been tasked to assess a client’s network. The client reports frequent network outages. Upon
viewing the spanning tree configuration, the consultant notices that an old and law performing edge switch on
the network has been elected to be the root bridge. Which of the following explains this scenario?
The switch also serves as the DHCP server
The switch has the lowest MAC address
The switch has spanning tree loop protection enabled
The switch has the fastest uplink port
3 Comments on “Which of the following explains this scenario?”
Wrong. The correct answer should be B.
same web site, same question, different answers….
who do you blame if you fail a test?
In STP all switches send BPDUs (Bridge Protocol Data Unit) which contain a priority and the BID (Bridge ID).
The BID is 8 bytes long. 6 bytes is used for the MAC address of the bridge. 12 bits is used to indicate the VLAN, this is called extended system ID. 4 bits are used to
set the priority. Lower priority means it is preferred compared to a higher. The priority is set in multiples of 4096.
If there is a tie in priority then the lowest MAC address will determine which bridge becomes the root.