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How does a switch with MSTP enabled learn the boundary between its MST region and another MST region?
A. It receives a BPDU from a non-Root switch with a Bridge Priority identical to the Root Bridge Priority.
B. It receives a BPDU from a switch with a different MST configuration.
C. It sends a BPDU that is rejected by a neighboring switch.
D. It receives a BPDU from a switch with a MAC address that is not in its MSTP forwarding table.
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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