Cisco CCNP 350-401 ENCOR RSTP, MST, Root Guard, and BPDU Guard Practice Test 1

 

Topic 07 Practice Test 1 covers RSTP, MST, Root Guard, and BPDU Guard for Cisco 350-401 ENCOR. For broader exam preparation, review the Cisco 350-401 ENCOR Exam Dumps. Every option includes focused technical reasoning explaining both the Cisco enterprise networking concept and its fit to the scenario.

Question 1

A network operations group must select the nonroot switch port with the best path toward the root bridge. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. RSTP root port
  2. MST revision number
  3. secondary root planning
  4. consistent point-to-point link type

Correct Answer(s)

 

A

Rationale

  1. RSTP root port is correct because it chooses the lowest total root-path cost with defined tie breakers. The stem needs the team to select the nonroot switch port with the best path toward the root bridge. That fit makes RSTP root port meet the constraint; alternatives differ materially.
  2. The role of MST revision number is to match the administrative revision used in the region configuration. It is useful when MST neighbors have identical names and mappings but region digests still differ. Here the design needs RSTP root port; this choice instead solves an adjacent problem.
  3. secondary root planning works by uses the next-best bridge priority on a chosen backup distribution switch. It fits where the design should fail over to a known root rather than whichever access switch has the lowest bridge ID. The required function here is RSTP root port, so this option targets the wrong condition.
  4. consistent point-to-point link type can be appropriate because it treats the link as point-to-point so proposal/agreement can operate as designed. Apply it where a switch link remains slow to converge because it is not operating with appropriate RSTP link semantics. This case depends on RSTP root port, leaving consistent point-to-point link type mismatched to the requirement.

 

Question 2

A application team must forward toward a LAN segment from the switch offering the best path to the root. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. MST VLAN-to-instance mapping
  2. port cost tuning
  3. RSTP root port
  4. RSTP designated port

Correct Answer(s)

 

D

Rationale

  1. The role of MST VLAN-to-instance mapping is to place VLANs into explicit MST instances to share spanning-tree calculations. It is useful when the network needs multiple logical trees but fewer instances than the total VLAN count. Here the design needs RSTP designated port; this choice instead solves an adjacent problem.
  2. The role of port cost tuning is to influence which redundant path becomes the root path without changing the root bridge. It is useful when the root is correct but traffic should use a different uplink as the normal forwarding path. Here the design needs RSTP designated port; this choice instead solves an adjacent problem.
  3. RSTP root port belongs where a nonroot switch needs one forwarding path that represents its best route to the root. It helps to select the nonroot switch port with the best path toward the root bridge. The stem instead requires RSTP designated port, so RSTP root port does not meet the decisive condition.
  4. RSTP designated port is correct because it wins the designated-port election for a segment and advertises superior BPDUs there. The stem needs the team to forward toward a LAN segment from the switch offering the best path to the root. That fit makes RSTP designated port meet the constraint; alternatives differ materially.

 

Question 3

A enterprise architect must keep a loop-free backup path to the root ready for rapid convergence. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. MST Instance 0 IST
  2. RSTP alternate port
  3. port priority tie breaker
  4. RSTP designated port

Correct Answer(s)

 

B

Rationale

  1. MST Instance 0 IST works by runs as the Internal Spanning Tree and carries the region’s relationship to the CIST. It fits where operators need to understand which instance links the MST region to the outside spanning-tree topology. The required function here is RSTP alternate port, so this option targets the wrong condition.
  2. RSTP alternate port is correct because it receives superior BPDUs on a redundant path and remains discarding until needed. The stem needs the team to keep a loop-free backup path to the root ready for rapid convergence. That fit makes RSTP alternate port meet the constraint; alternatives differ materially.
  3. port priority tie breaker can be appropriate because it adjusts the port identifier component used after root-path costs tie. Apply it where parallel links have equal path cost and the engineer needs deterministic selection. This case depends on RSTP alternate port, leaving port priority tie breaker mismatched to the requirement.
  4. The role of RSTP designated port is to forward toward a LAN segment from the switch offering the best path to the root. It is useful when a shared segment needs one forwarding port toward the spanning-tree root. Here the design needs RSTP alternate port; this choice instead solves an adjacent problem.

 

Question 4

A site reliability team must allow an end-host-facing port to transition rapidly without waiting for normal topology convergence. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. CIST root
  2. superior BPDU evidence
  3. RSTP edge port
  4. RSTP alternate port

Correct Answer(s)

 

C

Rationale

  1. Use CIST root to determine the common root view across MST regions and external 802.1D/RSTP domains. Its mechanism combines the common tree between regions with each region’s internal tree representation. The current scenario requires RSTP edge port; CIST root solves a different design issue.
  2. Use superior BPDU evidence to recognize that a neighbor advertises a better root or path than the local switch. Its mechanism compares received BPDU fields to determine whether the neighbor information is superior. The current scenario requires RSTP edge port; superior BPDU evidence solves a different design issue.
  3. RSTP edge port is correct because it marks the port as edge while still allowing protection if unexpected BPDUs appear. The stem needs the team to allow an end-host-facing port to transition rapidly without waiting for normal topology convergence. That fit makes RSTP edge port meet the constraint; alternatives differ materially.
  4. RSTP alternate port belongs where a switch has a second path to the root that should not forward during normal operation. It helps to keep a loop-free backup path to the root ready for rapid convergence. The stem instead requires RSTP edge port, so RSTP alternate port does not meet the decisive condition.

 

Question 5

A security engineering group must shut or err-disable an edge access port if a BPDU is received. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. RSTP proposal-agreement
  2. BPDU Guard
  3. MST boundary port
  4. RSTP edge port

Correct Answer(s)

 

B

Rationale

  1. RSTP proposal-agreement is meant to rapidly synchronize a point-to-point link before forwarding. Use it when a full-duplex switch-to-switch link should converge faster than legacy timer-based STP. This stem calls for BPDU Guard; RSTP proposal-agreement addresses another operational need.
  2. BPDU Guard is correct because it protects PortFast or edge interfaces from an unexpected switch connection. The stem needs the team to shut or err-disable an edge access port if a BPDU is received. That fit makes BPDU Guard meet the constraint; alternatives differ materially.
  3. MST boundary port can be appropriate because it treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. Apply it where two adjacent switches intentionally belong to different regions. This case depends on BPDU Guard, leaving MST boundary port mismatched to the requirement.
  4. RSTP edge port can be appropriate because it marks the port as edge while still allowing protection if unexpected BPDUs appear. Apply it where a workstation or server link should become usable quickly and is not intended to connect another switch. This case depends on BPDU Guard, leaving RSTP edge port mismatched to the requirement.

 

Question 6

A branch deployment team must prevent a downstream port from becoming a path toward a superior root bridge. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. root bridge priority tuning
  2. Root Guard
  3. BPDU filtering risk awareness
  4. BPDU Guard

Correct Answer(s)

 

B

Rationale

  1. root bridge priority tuning belongs where the current root changes unpredictably when switches are replaced. It helps to make the intended switch win root election predictably. The stem instead requires Root Guard, so root bridge priority tuning does not meet the decisive condition.
  2. Root Guard is correct because it places the port in a root-inconsistent state when superior BPDUs arrive and recovers when they stop. The stem needs the team to prevent a downstream port from becoming a path toward a superior root bridge. That fit makes Root Guard meet the constraint; alternatives differ materially.
  3. Use BPDU filtering risk awareness to understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. Its mechanism prevents normal BPDU processing and can create dangerous silent loops if misapplied. The current scenario requires Root Guard; BPDU filtering risk awareness solves a different design issue.
  4. BPDU Guard can be appropriate because it protects PortFast or edge interfaces from an unexpected switch connection. Apply it where an access port must fail closed when someone connects a bridge or switch. This case depends on Root Guard, leaving BPDU Guard mismatched to the requirement.

 

Question 7

A support organization must match the configured region identifier across switches that should share MST instance mapping. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. secondary root planning
  2. consistent point-to-point link type
  3. Root Guard
  4. MST region name

Correct Answer(s)

 

D

Rationale

  1. secondary root planning works by uses the next-best bridge priority on a chosen backup distribution switch. It fits where the design should fail over to a known root rather than whichever access switch has the lowest bridge ID. The required function here is MST region name, so this option targets the wrong condition.
  2. consistent point-to-point link type can be appropriate because it treats the link as point-to-point so proposal/agreement can operate as designed. Apply it where a switch link remains slow to converge because it is not operating with appropriate RSTP link semantics. This case depends on MST region name, leaving consistent point-to-point link type mismatched to the requirement.
  3. Root Guard belongs where the network design must keep the root bridge in the distribution/core layer. It helps to prevent a downstream port from becoming a path toward a superior root bridge. The stem instead requires MST region name, so Root Guard does not meet the decisive condition.
  4. MST region name is correct because it forms part of the MST configuration digest used to determine region membership. The stem needs the team to match the configured region identifier across switches that should share MST instance mapping. That fit makes MST region name meet the constraint; alternatives differ materially.

 

Question 8

A cloud engineering team must match the administrative revision used in the region configuration. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. MST revision number
  2. port cost tuning
  3. RSTP root port
  4. MST region name

Correct Answer(s)

 

A

Rationale

  1. MST revision number is correct because it participates with name and VLAN-to-instance mapping in region consistency. The stem needs the team to match the administrative revision used in the region configuration. That fit makes MST revision number meet the constraint; alternatives differ materially.
  2. The role of port cost tuning is to influence which redundant path becomes the root path without changing the root bridge. It is useful when the root is correct but traffic should use a different uplink as the normal forwarding path. Here the design needs MST revision number; this choice instead solves an adjacent problem.
  3. RSTP root port belongs where a nonroot switch needs one forwarding path that represents its best route to the root. It helps to select the nonroot switch port with the best path toward the root bridge. The stem instead requires MST revision number, so RSTP root port does not meet the decisive condition.
  4. Use MST region name to match the configured region identifier across switches that should share MST instance mapping. Its mechanism forms part of the MST configuration digest used to determine region membership. The current scenario requires MST revision number; MST region name solves a different design issue.

 

Question 9

A infrastructure team must place VLANs into explicit MST instances to share spanning-tree calculations. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. MST VLAN-to-instance mapping
  2. port priority tie breaker
  3. RSTP designated port
  4. MST revision number

Correct Answer(s)

 

A

Rationale

  1. MST VLAN-to-instance mapping is correct because it maps groups of VLANs to MSTIs so topology can differ by instance without per-VLAN trees. The stem needs the team to place VLANs into explicit MST instances to share spanning-tree calculations. That fit makes MST VLAN-to-instance mapping meet the constraint; alternatives differ materially.
  2. port priority tie breaker can be appropriate because it adjusts the port identifier component used after root-path costs tie. Apply it where parallel links have equal path cost and the engineer needs deterministic selection. This case depends on MST VLAN-to-instance mapping, leaving port priority tie breaker mismatched to the requirement.
  3. The role of RSTP designated port is to forward toward a LAN segment from the switch offering the best path to the root. It is useful when a shared segment needs one forwarding port toward the spanning-tree root. Here the design needs MST VLAN-to-instance mapping; this choice instead solves an adjacent problem.
  4. Use MST revision number to match the administrative revision used in the region configuration. Its mechanism participates with name and VLAN-to-instance mapping in region consistency. The current scenario requires MST VLAN-to-instance mapping; MST revision number solves a different design issue.

 

Question 10

A architecture review board must provide the internal spanning-tree instance that represents the region toward the common tree. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. superior BPDU evidence
  2. RSTP alternate port
  3. MST Instance 0 IST
  4. MST VLAN-to-instance mapping

Correct Answer(s)

 

C

Rationale

  1. Use superior BPDU evidence to recognize that a neighbor advertises a better root or path than the local switch. Its mechanism compares received BPDU fields to determine whether the neighbor information is superior. The current scenario requires MST Instance 0 IST; superior BPDU evidence solves a different design issue.
  2. RSTP alternate port belongs where a switch has a second path to the root that should not forward during normal operation. It helps to keep a loop-free backup path to the root ready for rapid convergence. The stem instead requires MST Instance 0 IST, so RSTP alternate port does not meet the decisive condition.
  3. MST Instance 0 IST is correct because it runs as the Internal Spanning Tree and carries the region’s relationship to the CIST. The stem needs the team to provide the internal spanning-tree instance that represents the region toward the common tree. That fit makes MST Instance 0 IST meet the constraint; alternatives differ materially.
  4. Use MST VLAN-to-instance mapping to place VLANs into explicit MST instances to share spanning-tree calculations. Its mechanism maps groups of VLANs to MSTIs so topology can differ by instance without per-VLAN trees. The current scenario requires MST Instance 0 IST; MST VLAN-to-instance mapping solves a different design issue.

 

Question 11

A production operations group must determine the common root view across MST regions and external 802.1D/RSTP domains. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. MST boundary port
  2. CIST root
  3. RSTP edge port
  4. MST Instance 0 IST

Correct Answer(s)

 

B

Rationale

  1. MST boundary port can be appropriate because it treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. Apply it where two adjacent switches intentionally belong to different regions. This case depends on CIST root, leaving MST boundary port mismatched to the requirement.
  2. CIST root is correct because it combines the common tree between regions with each region’s internal tree representation. The stem needs the team to determine the common root view across MST regions and external 802.1D/RSTP domains. That fit makes CIST root meet the constraint; alternatives differ materially.
  3. RSTP edge port can be appropriate because it marks the port as edge while still allowing protection if unexpected BPDUs appear. Apply it where a workstation or server link should become usable quickly and is not intended to connect another switch. This case depends on CIST root, leaving RSTP edge port mismatched to the requirement.
  4. MST Instance 0 IST can be appropriate because it runs as the Internal Spanning Tree and carries the region’s relationship to the CIST. Apply it where operators need to understand which instance links the MST region to the outside spanning-tree topology. This case depends on CIST root, leaving MST Instance 0 IST mismatched to the requirement.

 

Question 12

A platform team must rapidly synchronize a point-to-point link before forwarding. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. BPDU filtering risk awareness
  2. RSTP proposal-agreement
  3. BPDU Guard
  4. CIST root

Correct Answer(s)

 

B

Rationale

  1. Use BPDU filtering risk awareness to understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. Its mechanism prevents normal BPDU processing and can create dangerous silent loops if misapplied. The current scenario requires RSTP proposal-agreement; BPDU filtering risk awareness solves a different design issue.
  2. RSTP proposal-agreement is correct because it uses handshake semantics so a designated port can transition quickly when the downstream switch agrees to the topology. The stem needs the team to rapidly synchronize a point-to-point link before forwarding. That fit makes RSTP proposal-agreement meet the constraint; alternatives differ materially.
  3. BPDU Guard can be appropriate because it protects PortFast or edge interfaces from an unexpected switch connection. Apply it where an access port must fail closed when someone connects a bridge or switch. This case depends on RSTP proposal-agreement, leaving BPDU Guard mismatched to the requirement.
  4. CIST root is meant to determine the common root view across MST regions and external 802.1D/RSTP domains. Use it when the topology spans multiple MST regions and requires one common spanning-tree reference. This stem calls for RSTP proposal-agreement; CIST root addresses another operational need.

 

Question 13

A network operations group must make the intended switch win root election predictably. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. consistent point-to-point link type
  2. Root Guard
  3. RSTP proposal-agreement
  4. root bridge priority tuning

Correct Answer(s)

 

D

Rationale

  1. consistent point-to-point link type can be appropriate because it treats the link as point-to-point so proposal/agreement can operate as designed. Apply it where a switch link remains slow to converge because it is not operating with appropriate RSTP link semantics. This case depends on root bridge priority tuning, leaving consistent point-to-point link type mismatched to the requirement.
  2. Root Guard belongs where the network design must keep the root bridge in the distribution/core layer. It helps to prevent a downstream port from becoming a path toward a superior root bridge. The stem instead requires root bridge priority tuning, so Root Guard does not meet the decisive condition.
  3. The role of RSTP proposal-agreement is to rapidly synchronize a point-to-point link before forwarding. It is useful when a full-duplex switch-to-switch link should converge faster than legacy timer-based STP. Here the design needs root bridge priority tuning; this choice instead solves an adjacent problem.
  4. root bridge priority tuning is correct because it configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. The stem needs the team to make the intended switch win root election predictably. That fit makes root bridge priority tuning meet the constraint; alternatives differ materially.

 

Question 14

A application team must provide a deterministic backup root if the primary root fails. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. RSTP root port
  2. MST region name
  3. secondary root planning
  4. root bridge priority tuning

Correct Answer(s)

 

C

Rationale

  1. RSTP root port belongs where a nonroot switch needs one forwarding path that represents its best route to the root. It helps to select the nonroot switch port with the best path toward the root bridge. The stem instead requires secondary root planning, so RSTP root port does not meet the decisive condition.
  2. Use MST region name to match the configured region identifier across switches that should share MST instance mapping. Its mechanism forms part of the MST configuration digest used to determine region membership. The current scenario requires secondary root planning; MST region name solves a different design issue.
  3. secondary root planning is correct because it uses the next-best bridge priority on a chosen backup distribution switch. The stem needs the team to provide a deterministic backup root if the primary root fails. That fit makes secondary root planning meet the constraint; alternatives differ materially.
  4. root bridge priority tuning works by configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. It fits where the current root changes unpredictably when switches are replaced. The required function here is secondary root planning, so this option targets the wrong condition.

 

Question 15

A enterprise architect must influence which redundant path becomes the root path without changing the root bridge. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. RSTP designated port
  2. MST revision number
  3. port cost tuning
  4. secondary root planning

Correct Answer(s)

 

C

Rationale

  1. The role of RSTP designated port is to forward toward a LAN segment from the switch offering the best path to the root. It is useful when a shared segment needs one forwarding port toward the spanning-tree root. Here the design needs port cost tuning; this choice instead solves an adjacent problem.
  2. Use MST revision number to match the administrative revision used in the region configuration. Its mechanism participates with name and VLAN-to-instance mapping in region consistency. The current scenario requires port cost tuning; MST revision number solves a different design issue.
  3. port cost tuning is correct because it changes spanning-tree path cost so one uplink is preferred over another. The stem needs the team to influence which redundant path becomes the root path without changing the root bridge. That fit makes port cost tuning meet the constraint; alternatives differ materially.
  4. secondary root planning can be appropriate because it uses the next-best bridge priority on a chosen backup distribution switch. Apply it where the design should fail over to a known root rather than whichever access switch has the lowest bridge ID. This case depends on port cost tuning, leaving secondary root planning mismatched to the requirement.

 

Question 16

A site reliability team must choose between equal-cost links on the same upstream bridge. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. RSTP alternate port
  2. MST VLAN-to-instance mapping
  3. port cost tuning
  4. port priority tie breaker

Correct Answer(s)

 

D

Rationale

  1. RSTP alternate port belongs where a switch has a second path to the root that should not forward during normal operation. It helps to keep a loop-free backup path to the root ready for rapid convergence. The stem instead requires port priority tie breaker, so RSTP alternate port does not meet the decisive condition.
  2. Use MST VLAN-to-instance mapping to place VLANs into explicit MST instances to share spanning-tree calculations. Its mechanism maps groups of VLANs to MSTIs so topology can differ by instance without per-VLAN trees. The current scenario requires port priority tie breaker; MST VLAN-to-instance mapping solves a different design issue.
  3. Use port cost tuning to influence which redundant path becomes the root path without changing the root bridge. Its mechanism changes spanning-tree path cost so one uplink is preferred over another. The current scenario requires port priority tie breaker; port cost tuning solves a different design issue.
  4. port priority tie breaker is correct because it adjusts the port identifier component used after root-path costs tie. The stem needs the team to choose between equal-cost links on the same upstream bridge. That fit makes port priority tie breaker meet the constraint; alternatives differ materially.

 

Question 17

A security engineering group must recognize that a neighbor advertises a better root or path than the local switch. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. superior BPDU evidence
  2. RSTP edge port
  3. MST Instance 0 IST
  4. port priority tie breaker

Correct Answer(s)

 

A

Rationale

  1. superior BPDU evidence is correct because it compares received BPDU fields to determine whether the neighbor information is superior. The stem needs the team to recognize that a neighbor advertises a better root or path than the local switch. That fit makes superior BPDU evidence meet the constraint; alternatives differ materially.
  2. RSTP edge port can be appropriate because it marks the port as edge while still allowing protection if unexpected BPDUs appear. Apply it where a workstation or server link should become usable quickly and is not intended to connect another switch. This case depends on superior BPDU evidence, leaving RSTP edge port mismatched to the requirement.
  3. MST Instance 0 IST can be appropriate because it runs as the Internal Spanning Tree and carries the region’s relationship to the CIST. Apply it where operators need to understand which instance links the MST region to the outside spanning-tree topology. This case depends on superior BPDU evidence, leaving MST Instance 0 IST mismatched to the requirement.
  4. port priority tie breaker belongs where parallel links have equal path cost and the engineer needs deterministic selection. It helps to choose between equal-cost links on the same upstream bridge. The stem instead requires superior BPDU evidence, so port priority tie breaker does not meet the decisive condition.

 

Question 18

A branch deployment team must identify a port connecting an MST region to a different region or spanning-tree mode. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. BPDU Guard
  2. CIST root
  3. superior BPDU evidence
  4. MST boundary port

Correct Answer(s)

 

D

Rationale

  1. BPDU Guard can be appropriate because it protects PortFast or edge interfaces from an unexpected switch connection. Apply it where an access port must fail closed when someone connects a bridge or switch. This case depends on MST boundary port, leaving BPDU Guard mismatched to the requirement.
  2. CIST root is meant to determine the common root view across MST regions and external 802.1D/RSTP domains. Use it when the topology spans multiple MST regions and requires one common spanning-tree reference. This stem calls for MST boundary port; CIST root addresses another operational need.
  3. superior BPDU evidence is meant to recognize that a neighbor advertises a better root or path than the local switch. Use it when a protection feature triggers and the engineer must confirm the cause is a superior spanning-tree advertisement. This stem calls for MST boundary port; superior BPDU evidence addresses another operational need.
  4. MST boundary port is correct because it treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. The stem needs the team to identify a port connecting an MST region to a different region or spanning-tree mode. That fit makes MST boundary port meet the constraint; alternatives differ materially.

 

Question 19

A support organization must understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. BPDU filtering risk awareness
  2. Root Guard
  3. RSTP proposal-agreement
  4. MST boundary port

Correct Answer(s)

 

A

Rationale

  1. BPDU filtering risk awareness is correct because it prevents normal BPDU processing and can create dangerous silent loops if misapplied. The stem needs the team to understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. That fit makes BPDU filtering risk awareness meet the constraint; alternatives differ materially.
  2. Root Guard belongs where the network design must keep the root bridge in the distribution/core layer. It helps to prevent a downstream port from becoming a path toward a superior root bridge. The stem instead requires BPDU filtering risk awareness, so Root Guard does not meet the decisive condition.
  3. The role of RSTP proposal-agreement is to rapidly synchronize a point-to-point link before forwarding. It is useful when a full-duplex switch-to-switch link should converge faster than legacy timer-based STP. Here the design needs BPDU filtering risk awareness; this choice instead solves an adjacent problem.
  4. MST boundary port belongs where two adjacent switches intentionally belong to different regions. It helps to identify a port connecting an MST region to a different region or spanning-tree mode. The stem instead requires BPDU filtering risk awareness, so MST boundary port does not meet the decisive condition.

 

Question 20

A cloud engineering team must enable RSTP rapid transition behavior on suitable full-duplex links. Which approach most directly satisfies the stated requirement? Choose ONE.

  1. MST region name
  2. root bridge priority tuning
  3. consistent point-to-point link type
  4. BPDU filtering risk awareness

Correct Answer(s)

 

C

Rationale

  1. Use MST region name to match the configured region identifier across switches that should share MST instance mapping. Its mechanism forms part of the MST configuration digest used to determine region membership. The current scenario requires consistent point-to-point link type; MST region name solves a different design issue.
  2. root bridge priority tuning works by configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. It fits where the current root changes unpredictably when switches are replaced. The required function here is consistent point-to-point link type, so this option targets the wrong condition.
  3. consistent point-to-point link type is correct because it treats the link as point-to-point so proposal/agreement can operate as designed. The stem needs the team to enable RSTP rapid transition behavior on suitable full-duplex links. That fit makes consistent point-to-point link type meet the constraint; alternatives differ materially.
  4. BPDU filtering risk awareness is meant to understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. Use it when an engineer is considering hiding BPDUs on a switch-to-switch link to stop topology changes. This stem calls for consistent point-to-point link type; BPDU filtering risk awareness addresses another operational need.

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