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The output of show spanning-tree instance 4 on three HP E5406 zl Series switches indicates that all three switches are the Root of MST instance 4.
What is a possible explanation of this result?
A. The switches have identical Bridge Priorities.
B. The switches have different MST configuration revisions.
C. The switches are running different software versions.
D. The switches have identical Port Priorities for ports associated with the instance.
Correct Answer: B
Explanation/Reference:
MST region
A multiple spanning tree region (MST region) consists of multiple devices in a switched network and the network segments among them. These devices have the following characteristics:
All are MSTP-enabled
They have the same region name
They have the same VLAN-to-instance mapping configuration
They have the same MSTP revision level configuration
They are physically linked with one another
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