Practice Test Geeks(ACSP) Aruba Certified Switching Professional Practice Test
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Spanning Tree Protocol (STP) Flashcards

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

Read the first 7 Spanning Tree Protocol (STP) flashcards as text

  1. Which STP port state forwards BPDUs but discards user data frames and does not learn MAC addresses?

    Answer: Listening

    In the Listening state, a port sends and receives BPDUs to determine topology but does not forward data frames or learn MAC addresses.

  2. What is the default STP port cost for a 10 Gbps link using IEEE 802.1D-2004 long path cost values?

    Answer: 4

    IEEE 802.1D-2004 assigns a long path cost of 4 to a 10 Gbps link, replacing the original short values.

  3. In MSTP, what is the name of the instance that all VLANs belong to by default before being mapped to an MST instance?

    Answer: CIST (Common and Internal Spanning Tree)

    The CIST is the spanning tree that interconnects all MST regions and the CST, and all VLANs default to MSTI 0 within it.

  4. Which RSTP port role replaces the STP Blocked port and provides an alternate path to the root bridge?

    Answer: Alternate port

    The RSTP Alternate port provides a redundant path to the root and can rapidly transition to Forwarding if the root port fails.

  5. What STP feature causes a switch port to immediately enter Forwarding state when connected to an end device, bypassing Listening and Learning states?

    Answer: PortFast

    PortFast enables edge ports to skip the Listening and Learning states and go directly to Forwarding, reducing connectivity delays for end hosts.

  6. A switch receives a BPDU with a lower bridge ID than its own on a designated port. What action does STP take?

    Answer: The port transitions to Blocking state

    When a designated port receives a superior BPDU, it yields and transitions to Blocking (or Discarding in RSTP), losing its designated role.

  7. Which RSTP link type enables rapid transition to Forwarding without waiting for a proposal-agreement handshake?

    Answer: Edge port with PortFast

    Edge ports configured with PortFast in RSTP immediately enter Forwarding state because they are not connected to other bridges, requiring no handshake.