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Configuration and Management 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 Configuration and Management flashcards as text

  1. An administrator wants to influence STP path selection on a per-port basis without changing bridge priority. What is the correct approach?

    Answer: Change the port cost using 'spanning-tree vlan X cost'

    Adjusting the port cost with 'spanning-tree vlan X cost' influences which path STP prefers without altering the bridge priority.

  2. What is the default STP port cost for a 1 Gbps link using the IEEE long path cost method?

    Answer: 20000

    Using the IEEE 802.1t long path cost method, a 1 Gbps link has a default cost of 20000, providing finer granularity for high-speed links.

  3. Which of the following correctly describes the 'spanning-tree pathcost method long' command?

    Answer: Switches the switch from 16-bit to 32-bit path cost values globally

    The 'spanning-tree pathcost method long' global command changes path cost calculation from the short (16-bit) method to the long (32-bit) method for better differentiation of high-bandwidth links.

  4. When MST is configured, what is the function of the MST instance 0 (IST)?

    Answer: It carries all unassigned VLANs and interoperates with CST at region boundaries

    MST Instance 0 (IST) carries all VLANs not mapped to other MSTIs and represents the MST region to the outside CST.

  5. What three parameters must match exactly for two switches to be in the same MST region?

    Answer: Region name, revision number, and VLAN-to-instance mapping

    MST region membership requires identical configuration name, revision number, and VLAN-to-instance mapping on all participating switches.

  6. Which command maps VLAN 10, 20, and 30 to MST instance 1?

    Answer: instance 1 vlan 10,20,30

    Under the MST configuration sub-mode, the command 'instance 1 vlan 10,20,30' maps those VLANs to MST instance 1.

  7. What is the administrative effect of 'spanning-tree bpdufilter enable' on an interface?

    Answer: The port neither sends nor processes received BPDUs, effectively disabling STP on that port

    BPDU Filter prevents the port from sending or receiving BPDUs, which disables STP participation on that interface and can create loops if misapplied.