ICND2: Interconnecting Cisco Networking Devices Part 2 (legacy) — Question 130

Which statement about STP root bridges is true?

Answer options

• A. Each VLAN must have a separate root bridge.
• B. An individual switch can be the root bridge for only one VLAN.
• C. The switch with the highest root ID is elected as the root bridge.
• D. Dynamic root bridge assignment is most efficient.

Correct answer: A

Explanation

Option A is correct because in Spanning Tree Protocol (STP), each VLAN requires its own root bridge to effectively manage its spanning tree. The other options are incorrect: B is wrong because a switch can be a root bridge for multiple VLANs, C is incorrect as the switch with the lowest root ID is elected as the root bridge, and D is not true since static assignments are usually more efficient than dynamic ones.