200-301 Question 246

Community Discussion

Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.

• Chose C1

  The correct answer is C (spanning-tree vlan 200 root primary) and not B (priority 0): While configuring spanning-tree vlan 200 priority 0 (option B) sets the lowest possible STP priority value, it is a manual and static configuration. It does not dynamically evaluate the current root bridge in the topology and does not adapt if changes occur later in the network. In contrast, spanning-tree vlan 200 root primary (option C) is the Cisco-recommended and dynamic method to ensure a switch becomes — and stays — the root bridge for a given VLAN. This command: Automatically sets the switch’s priority to 24576, or If another switch already has a lower priority, it will set the local priority to 4096 less than the current root’s priority This ensures the local switch takes over as the root bridge without the need for manual priority calculation and provides greater flexibility and reliability in real-world environments. Correct Answer: C

• Chose B2

  The primary keyword sets the priority to 24,576, and the secondary keyword sets the priority to 28,672. spanning-tree vlan vlan-id root {primary | secondary} [diameter diameter]: This command executes a script that modifies certain values. Explanation in this link. https://www.ciscopress.com/articles/article.asp?p=2995351&seqNum=2

• 2

  I think C is correct. When you connect another switch with the same priority 0, won't a root bridge election take place? And since an election happens, there's no guarantee that the switch will be the root since the other switch may have a lower MAC address.