Free 4A0-105 Exam braindumps download (4A0-105 exam dumps Free)

How is the Primary Bridge chosen in a VPLS?

The PE devices participating in the VPLS mesh run a separate Spanning Tree instance in the Core. The Primary Bridge is the Root Bridge for the VPLS mesh.
The PE devices participating in the VPLS mesh determine which bridge is closest to Root Bridge. This bridge becomes the Primary Bridge.
The PE devices participating in the VPLS mesh determine which bridge has the lowest bridge-id. This bridge becomes the Primary Bridge.
The PE devices participating in the VPLS mesh determine which bridge is the Root Bridge. This becomes the Primary Bridge.

Answer(s): B

When spanning tree is enabled within a VPLS service and the STP mode is 802.1 D 2004 what happens if a PVST BPDU is received on a SAP?

Spanning tree will be disabled on the SAP that the PVST BPDU was received on.
The SAP that the PVST BPDU was received on will be disabled to prevent loops.
The spanning tree encapsulation will be dynamically changed to PVST on the SAP the PVST BPDU was received on.
The PVST BPDU will be ignored and 802.1D 2004 BPDUs will continue to be transmitted on the SAP.

Answer(s): C

Click on the exhibit below.

Which bridge will become the root bridge?

Answer(s): D

Which of the following statements about Spanning Tree Protocol is true?

For the switches that are non-root or designated switches, the port with the highest combined cost to the root is the root port.
In the case where two switches have the same priority, the switch with the lowest MAC address becomes the root.
The switch port that is the greatest distance from the LAN to the root is the designated port.
All of the above.

Answer(s): B