Practice Test Geeks(STP) Spanning Tree Protocol Practice Test
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Clinical & Scientific Knowledge Flashcards

7 cards from real STP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Clinical & Scientific Knowledge flashcards as text

  1. Which STP port state actively forwards frames AND learns MAC addresses?

    Answer: Forwarding

    Only the Forwarding state both learns MAC addresses and actively forwards data frames.

  2. What is the default Hello Time interval in 802.1D STP?

    Answer: 2 seconds

    The default Hello Time is 2 seconds, meaning the root bridge sends BPDUs every 2 seconds.

  3. A non-root bridge receives a superior BPDU on its root port. What action does STP take?

    Answer: It updates its root port and recalculates the topology

    When a non-root bridge receives a superior BPDU, it updates its root port selection and recalculates path costs.

  4. Which STP mechanism prevents a port from immediately transitioning to Forwarding after a link comes up?

    Answer: Forward Delay timer

    The Forward Delay timer (default 15 seconds) holds ports in Listening and Learning states before transitioning to Forwarding.

  5. In STP, what does a Topology Change Notification (TCN) BPDU cause receiving switches to do?

    Answer: Age out MAC table entries faster

    TCN BPDUs cause switches to shorten their MAC address aging timer from 300 seconds to the Forward Delay (15 seconds).

  6. Which STP variant uses one instance of spanning tree per VLAN?

    Answer: PVST+

    PVST+ (Per-VLAN Spanning Tree Plus) runs a separate STP instance for each VLAN, allowing per-VLAN load balancing.

  7. What is the STP port role of a port on the root bridge that connects to another switch?

    Answer: Designated Port

    All ports on the root bridge are Designated Ports because the root bridge always has the best path cost of zero.