200-150 Question #123: Real Exam Question with Answer & Explanation

The correct answer is B: 32769. This question tests knowledge of the default bridge ID priority value used in Cisco's Rapid PVST+ spanning-tree implementation.

Cisco Data Center Networking Technologies

Question

What is the default bridge ID priority for Rapid PVST+?

Options

A128
B32769
C32768
D4096

Explanation

This question tests knowledge of the default bridge ID priority value used in Cisco's Rapid PVST+ spanning-tree implementation.

Common mistakes.

A. 128 is the default spanning-tree port priority value, not the bridge ID priority.
C. 32768 is the base priority before the extended system ID (VLAN ID) is added; once VLAN 1's ID is appended, the effective value becomes 32769.
D. 4096 is the increment unit used when manually configuring bridge priority values; it is not the default priority.

Concept tested. Rapid PVST+ default bridge ID priority with extended system ID

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9600/software/release/17-1/configuration_guide/lyr2/b_171_lyr2_9600_cg/configuring_rapid_pvst.html

Topics

#Rapid PVST+#spanning tree#bridge priority#STP

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