Cisco CCNP 350-401 ENCOR RSTP, MST, Root Guard, and BPDU Guard Practice Test 2

 

Topic 07 Practice Test 2 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 nonroot switch needs one forwarding path that represents its best route to the root, but the current design is not providing the expected result. The branch deployment team wants a component that chooses the lowest total root-path cost with defined tie breakers. Which change should be made? Choose ONE.

  1. CIST root
  2. BPDU filtering risk awareness
  3. RSTP root port
  4. MST region name

Correct Answer(s)

 

C

Rationale

  1. The role of CIST root is to determine the common root view across MST regions and external 802.1D/RSTP domains. It is useful when the topology spans multiple MST regions and requires one common spanning-tree reference. Here the design needs RSTP root port; this choice instead solves an adjacent problem.
  2. 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 RSTP root port; BPDU filtering risk awareness addresses another operational need.
  3. Choose RSTP root port. Its function is to chooses the lowest total root-path cost with defined tie breakers. Here the required outcome is to select the nonroot switch port with the best path toward the root bridge. This capability places RSTP root port at the proper layer; alternatives do not.
  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 RSTP root port; MST region name solves a different design issue.

 

Question 2

A shared segment needs one forwarding port toward the spanning-tree root, but the current design is not providing the expected result. The support organization wants a component that wins the designated-port election for a segment and advertises superior BPDUs there. Which change should be made? Choose ONE.

  1. RSTP proposal-agreement
  2. consistent point-to-point link type
  3. MST revision number
  4. RSTP designated port

Correct Answer(s)

 

D

Rationale

  1. Use RSTP proposal-agreement to rapidly synchronize a point-to-point link before forwarding. Its mechanism uses handshake semantics so a designated port can transition quickly when the downstream switch agrees to the topology. The current scenario requires RSTP designated port; RSTP proposal-agreement solves a different design issue.
  2. consistent point-to-point link type belongs where a switch link remains slow to converge because it is not operating with appropriate RSTP link semantics. It helps to enable RSTP rapid transition behavior on suitable full-duplex links. The stem instead requires RSTP designated port, so consistent point-to-point link type does not meet the decisive condition.
  3. 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 RSTP designated port; MST revision number solves a different design issue.
  4. Choose RSTP designated port. Its function is to wins the designated-port election for a segment and advertises superior BPDUs there. Here the required outcome is to forward toward a LAN segment from the switch offering the best path to the root. This capability places RSTP designated port at the proper layer; alternatives do not.

 

Question 3

A switch has a second path to the root that should not forward during normal operation, but the current design is not providing the expected result. The cloud engineering team wants a component that receives superior BPDUs on a redundant path and remains discarding until needed. Which change should be made? Choose ONE.

  1. root bridge priority tuning
  2. RSTP root port
  3. RSTP alternate port
  4. MST VLAN-to-instance mapping

Correct Answer(s)

 

C

Rationale

  1. root bridge priority tuning can be appropriate because it configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. Apply it where the current root changes unpredictably when switches are replaced. This case depends on RSTP alternate port, leaving root bridge priority tuning mismatched to the requirement.
  2. RSTP root port works by chooses the lowest total root-path cost with defined tie breakers. It fits where a nonroot switch needs one forwarding path that represents its best route to the root. The required function here is RSTP alternate port, so this option targets the wrong condition.
  3. Choose RSTP alternate port. Its function is to receives superior BPDUs on a redundant path and remains discarding until needed. Here the required outcome is to keep a loop-free backup path to the root ready for rapid convergence. This capability places RSTP alternate port at the proper layer; alternatives do not.
  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 RSTP alternate port; MST VLAN-to-instance mapping solves a different design issue.

 

Question 4

A workstation or server link should become usable quickly and is not intended to connect another switch, but the current design is not providing the expected result. The infrastructure team wants a component that marks the port as edge while still allowing protection if unexpected BPDUs appear. Which change should be made? Choose ONE.

  1. secondary root planning
  2. RSTP edge port
  3. RSTP designated port
  4. MST Instance 0 IST

Correct Answer(s)

 

B

Rationale

  1. secondary root planning belongs where the design should fail over to a known root rather than whichever access switch has the lowest bridge ID. It helps to provide a deterministic backup root if the primary root fails. The stem instead requires RSTP edge port, so secondary root planning does not meet the decisive condition.
  2. Choose RSTP edge port. Its function is to marks the port as edge while still allowing protection if unexpected BPDUs appear. Here the required outcome is to allow an end-host-facing port to transition rapidly without waiting for normal topology convergence. This capability places RSTP edge port at the proper layer; alternatives do not.
  3. Use RSTP designated port to forward toward a LAN segment from the switch offering the best path to the root. Its mechanism wins the designated-port election for a segment and advertises superior BPDUs there. The current scenario requires RSTP edge port; RSTP designated port solves a different design issue.
  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 RSTP edge port, leaving MST Instance 0 IST mismatched to the requirement.

 

Question 5

An access port must fail closed when someone connects a bridge or switch, but the current design is not providing the expected result. The architecture review board wants a component that protects PortFast or edge interfaces from an unexpected switch connection. Which change should be made? Choose ONE.

  1. BPDU Guard
  2. port cost tuning
  3. RSTP alternate port
  4. CIST root

Correct Answer(s)

 

A

Rationale

  1. Choose BPDU Guard. Its function is to protects PortFast or edge interfaces from an unexpected switch connection. Here the required outcome is to shut or err-disable an edge access port if a BPDU is received. This capability places BPDU Guard at the proper layer; alternatives do not.
  2. port cost tuning is meant to influence which redundant path becomes the root path without changing the root bridge. Use it when the root is correct but traffic should use a different uplink as the normal forwarding path. This stem calls for BPDU Guard; port cost tuning addresses another operational need.
  3. RSTP alternate port works by receives superior BPDUs on a redundant path and remains discarding until needed. It fits where a switch has a second path to the root that should not forward during normal operation. The required function here is BPDU Guard, so this option targets the wrong condition.
  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 BPDU Guard; CIST root addresses another operational need.

 

Question 6

The network design must keep the root bridge in the distribution/core layer, but the current design is not providing the expected result. The production operations group wants a component that places the port in a root-inconsistent state when superior BPDUs arrive and recovers when they stop. Which change should be made? Choose ONE.

  1. port priority tie breaker
  2. Root Guard
  3. RSTP edge port
  4. RSTP proposal-agreement

Correct Answer(s)

 

B

Rationale

  1. port priority tie breaker works by adjusts the port identifier component used after root-path costs tie. It fits where parallel links have equal path cost and the engineer needs deterministic selection. The required function here is Root Guard, so this option targets the wrong condition.
  2. Choose Root Guard. Its function is to places the port in a root-inconsistent state when superior BPDUs arrive and recovers when they stop. Here the required outcome is to prevent a downstream port from becoming a path toward a superior root bridge. This capability places Root Guard at the proper layer; alternatives do not.
  3. RSTP edge port belongs where a workstation or server link should become usable quickly and is not intended to connect another switch. It helps to allow an end-host-facing port to transition rapidly without waiting for normal topology convergence. The stem instead requires Root Guard, so RSTP edge port does not meet the decisive condition.
  4. 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 Guard; this choice instead solves an adjacent problem.

 

Question 7

Two switches with the same vlan mapping still appear in different mst regions, but the current design is not providing the expected result. The platform team wants a component that forms part of the MST configuration digest used to determine region membership. Which change should be made? Choose ONE.

  1. superior BPDU evidence
  2. BPDU Guard
  3. root bridge priority tuning
  4. MST region name

Correct Answer(s)

 

D

Rationale

  1. The role of superior BPDU evidence is to recognize that a neighbor advertises a better root or path than the local switch. It is useful when a protection feature triggers and the engineer must confirm the cause is a superior spanning-tree advertisement. Here the design needs MST region name; this choice instead solves an adjacent problem.
  2. BPDU Guard belongs where an access port must fail closed when someone connects a bridge or switch. It helps to shut or err-disable an edge access port if a BPDU is received. The stem instead requires MST region name, so BPDU Guard does not meet the decisive condition.
  3. 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 MST region name, so this option targets the wrong condition.
  4. Choose MST region name. Its function is to forms part of the MST configuration digest used to determine region membership. Here the required outcome is to match the configured region identifier across switches that should share MST instance mapping. This capability places MST region name at the proper layer; alternatives do not.

 

Question 8

Mst neighbors have identical names and mappings but region digests still differ, but the current design is not providing the expected result. The network operations group wants a component that participates with name and VLAN-to-instance mapping in region consistency. Which change should be made? Choose ONE.

  1. MST boundary port
  2. Root Guard
  3. secondary root planning
  4. MST revision number

Correct Answer(s)

 

D

Rationale

  1. MST boundary port works by treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. It fits where two adjacent switches intentionally belong to different regions. The required function here is MST revision number, so this option targets the wrong condition.
  2. Root Guard works by places the port in a root-inconsistent state when superior BPDUs arrive and recovers when they stop. It fits where the network design must keep the root bridge in the distribution/core layer. The required function here is MST revision number, so this option targets the wrong condition.
  3. 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 MST revision number, leaving secondary root planning mismatched to the requirement.
  4. Choose MST revision number. Its function is to participates with name and VLAN-to-instance mapping in region consistency. Here the required outcome is to match the administrative revision used in the region configuration. This capability places MST revision number at the proper layer; alternatives do not.

 

Question 9

The network needs multiple logical trees but fewer instances than the total vlan count, but the current design is not providing the expected result. The application team wants a component that maps groups of VLANs to MSTIs so topology can differ by instance without per-VLAN trees. Which change should be made? Choose ONE.

  1. BPDU filtering risk awareness
  2. MST region name
  3. MST VLAN-to-instance mapping
  4. port cost tuning

Correct Answer(s)

 

C

Rationale

  1. The role of BPDU filtering risk awareness is to understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. It is useful when an engineer is considering hiding BPDUs on a switch-to-switch link to stop topology changes. Here the design needs MST VLAN-to-instance mapping; this choice instead solves an adjacent problem.
  2. MST region name is meant to match the configured region identifier across switches that should share MST instance mapping. Use it when two switches with the same VLAN mapping still appear in different MST regions. This stem calls for MST VLAN-to-instance mapping; MST region name addresses another operational need.
  3. Choose MST VLAN-to-instance mapping. Its function is to maps groups of VLANs to MSTIs so topology can differ by instance without per-VLAN trees. Here the required outcome is to place VLANs into explicit MST instances to share spanning-tree calculations. This capability places MST VLAN-to-instance mapping at the proper layer; alternatives do not.
  4. 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 MST VLAN-to-instance mapping; port cost tuning solves a different design issue.

 

Question 10

Operators need to understand which instance links the mst region to the outside spanning-tree topology, but the current design is not providing the expected result. The enterprise architect wants a component that runs as the Internal Spanning Tree and carries the region’s relationship to the CIST. Which change should be made? Choose ONE.

  1. consistent point-to-point link type
  2. MST Instance 0 IST
  3. MST revision number
  4. port priority tie breaker

Correct Answer(s)

 

B

Rationale

  1. consistent point-to-point link type works by treats the link as point-to-point so proposal/agreement can operate as designed. It fits where a switch link remains slow to converge because it is not operating with appropriate RSTP link semantics. The required function here is MST Instance 0 IST, so this option targets the wrong condition.
  2. Choose MST Instance 0 IST. Its function is to runs as the Internal Spanning Tree and carries the region’s relationship to the CIST. Here the required outcome is to provide the internal spanning-tree instance that represents the region toward the common tree. This capability places MST Instance 0 IST at the proper layer; alternatives do not.
  3. MST revision number is meant to match the administrative revision used in the region configuration. Use it when MST neighbors have identical names and mappings but region digests still differ. This stem calls for MST Instance 0 IST; MST revision number addresses another operational need.
  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 MST Instance 0 IST, so port priority tie breaker does not meet the decisive condition.

 

Question 11

The topology spans multiple mst regions and requires one common spanning-tree reference, but the current design is not providing the expected result. The site reliability team wants a component that combines the common tree between regions with each region’s internal tree representation. Which change should be made? Choose ONE.

  1. RSTP root port
  2. MST VLAN-to-instance mapping
  3. superior BPDU evidence
  4. CIST root

Correct Answer(s)

 

D

Rationale

  1. RSTP root port can be appropriate because it chooses the lowest total root-path cost with defined tie breakers. Apply it where a nonroot switch needs one forwarding path that represents its best route to the root. This case depends on CIST root, leaving RSTP root port mismatched to the requirement.
  2. MST VLAN-to-instance mapping is meant to place VLANs into explicit MST instances to share spanning-tree calculations. Use it when the network needs multiple logical trees but fewer instances than the total VLAN count. This stem calls for CIST root; MST VLAN-to-instance mapping 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 CIST root; superior BPDU evidence addresses another operational need.
  4. Choose CIST root. Its function is to combines the common tree between regions with each region’s internal tree representation. Here the required outcome is to determine the common root view across MST regions and external 802.1D/RSTP domains. This capability places CIST root at the proper layer; alternatives do not.

 

Question 12

A full-duplex switch-to-switch link should converge faster than legacy timer-based stp, but the current design is not providing the expected result. The security engineering group wants a component that uses handshake semantics so a designated port can transition quickly when the downstream switch agrees to the topology. Which change should be made? Choose ONE.

  1. RSTP proposal-agreement
  2. RSTP designated port
  3. MST Instance 0 IST
  4. MST boundary port

Correct Answer(s)

 

A

Rationale

  1. Choose RSTP proposal-agreement. Its function is to uses handshake semantics so a designated port can transition quickly when the downstream switch agrees to the topology. Here the required outcome is to rapidly synchronize a point-to-point link before forwarding. This capability places RSTP proposal-agreement at the proper layer; alternatives do not.
  2. RSTP designated port is meant to forward toward a LAN segment from the switch offering the best path to the root. Use it when a shared segment needs one forwarding port toward the spanning-tree root. This stem calls for RSTP proposal-agreement; RSTP designated port addresses another operational need.
  3. MST Instance 0 IST belongs where operators need to understand which instance links the MST region to the outside spanning-tree topology. It helps to provide the internal spanning-tree instance that represents the region toward the common tree. The stem instead requires RSTP proposal-agreement, so MST Instance 0 IST does not meet the decisive condition.
  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 RSTP proposal-agreement, so MST boundary port does not meet the decisive condition.

 

Question 13

The current root changes unpredictably when switches are replaced, but the current design is not providing the expected result. The branch deployment team wants a component that configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. Which change should be made? Choose ONE.

  1. RSTP alternate port
  2. CIST root
  3. root bridge priority tuning
  4. BPDU filtering risk awareness

Correct Answer(s)

 

C

Rationale

  1. RSTP alternate port can be appropriate because it receives superior BPDUs on a redundant path and remains discarding until needed. Apply it where a switch has a second path to the root that should not forward during normal operation. This case depends on root bridge priority tuning, leaving RSTP alternate port mismatched to the requirement.
  2. The role of CIST root is to determine the common root view across MST regions and external 802.1D/RSTP domains. It is useful when the topology spans multiple MST regions and requires one common spanning-tree reference. Here the design needs root bridge priority tuning; this choice instead solves an adjacent problem.
  3. Choose root bridge priority tuning. Its function is to configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. Here the required outcome is to make the intended switch win root election predictably. This capability places root bridge priority tuning at the proper layer; alternatives do not.
  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 root bridge priority tuning; BPDU filtering risk awareness addresses another operational need.

 

Question 14

The design should fail over to a known root rather than whichever access switch has the lowest bridge id, but the current design is not providing the expected result. The support organization wants a component that uses the next-best bridge priority on a chosen backup distribution switch. Which change should be made? Choose ONE.

  1. RSTP edge port
  2. RSTP proposal-agreement
  3. consistent point-to-point link type
  4. secondary root planning

Correct Answer(s)

 

D

Rationale

  1. RSTP edge port works by marks the port as edge while still allowing protection if unexpected BPDUs appear. It fits where a workstation or server link should become usable quickly and is not intended to connect another switch. The required function here is secondary root planning, so this option targets the wrong condition.
  2. Use RSTP proposal-agreement to rapidly synchronize a point-to-point link before forwarding. Its mechanism uses handshake semantics so a designated port can transition quickly when the downstream switch agrees to the topology. The current scenario requires secondary root planning; RSTP proposal-agreement solves a different design issue.
  3. consistent point-to-point link type belongs where a switch link remains slow to converge because it is not operating with appropriate RSTP link semantics. It helps to enable RSTP rapid transition behavior on suitable full-duplex links. The stem instead requires secondary root planning, so consistent point-to-point link type does not meet the decisive condition.
  4. Choose secondary root planning. Its function is to uses the next-best bridge priority on a chosen backup distribution switch. Here the required outcome is to provide a deterministic backup root if the primary root fails. This capability places secondary root planning at the proper layer; alternatives do not.

 

Question 15

The root is correct but traffic should use a different uplink as the normal forwarding path, but the current design is not providing the expected result. The cloud engineering team wants a component that changes spanning-tree path cost so one uplink is preferred over another. Which change should be made? Choose ONE.

  1. BPDU Guard
  2. port cost tuning
  3. root bridge priority tuning
  4. RSTP root port

Correct Answer(s)

 

B

Rationale

  1. BPDU Guard works by protects PortFast or edge interfaces from an unexpected switch connection. It fits where an access port must fail closed when someone connects a bridge or switch. The required function here is port cost tuning, so this option targets the wrong condition.
  2. Choose port cost tuning. Its function is to changes spanning-tree path cost so one uplink is preferred over another. Here the required outcome is to influence which redundant path becomes the root path without changing the root bridge. This capability places port cost tuning at the proper layer; alternatives do not.
  3. root bridge priority tuning can be appropriate because it configures a lower bridge priority than competing switches instead of relying on MAC-address tie breakers. Apply it where the current root changes unpredictably when switches are replaced. This case depends on port cost tuning, leaving root bridge priority tuning mismatched to the requirement.
  4. RSTP root port works by chooses the lowest total root-path cost with defined tie breakers. It fits where a nonroot switch needs one forwarding path that represents its best route to the root. The required function here is port cost tuning, so this option targets the wrong condition.

 

Question 16

Parallel links have equal path cost and the engineer needs deterministic selection, but the current design is not providing the expected result. The infrastructure team wants a component that adjusts the port identifier component used after root-path costs tie. Which change should be made? Choose ONE.

  1. Root Guard
  2. port priority tie breaker
  3. secondary root planning
  4. RSTP designated port

Correct Answer(s)

 

B

Rationale

  1. Root Guard can be appropriate because it places the port in a root-inconsistent state when superior BPDUs arrive and recovers when they stop. Apply it where the network design must keep the root bridge in the distribution/core layer. This case depends on port priority tie breaker, leaving Root Guard mismatched to the requirement.
  2. Choose port priority tie breaker. Its function is to adjusts the port identifier component used after root-path costs tie. Here the required outcome is to choose between equal-cost links on the same upstream bridge. This capability places port priority tie breaker at the proper layer; alternatives do not.
  3. secondary root planning belongs where the design should fail over to a known root rather than whichever access switch has the lowest bridge ID. It helps to provide a deterministic backup root if the primary root fails. The stem instead requires port priority tie breaker, so secondary root planning does not meet the decisive condition.
  4. Use RSTP designated port to forward toward a LAN segment from the switch offering the best path to the root. Its mechanism wins the designated-port election for a segment and advertises superior BPDUs there. The current scenario requires port priority tie breaker; RSTP designated port solves a different design issue.

 

Question 17

A protection feature triggers and the engineer must confirm the cause is a superior spanning-tree advertisement, but the current design is not providing the expected result. The architecture review board wants a component that compares received BPDU fields to determine whether the neighbor information is superior. Which change should be made? Choose ONE.

  1. superior BPDU evidence
  2. MST region name
  3. port cost tuning
  4. RSTP alternate port

Correct Answer(s)

 

A

Rationale

  1. Choose superior BPDU evidence. Its function is to compares received BPDU fields to determine whether the neighbor information is superior. Here the required outcome is to recognize that a neighbor advertises a better root or path than the local switch. This capability places superior BPDU evidence at the proper layer; alternatives do not.
  2. The role of MST region name is to match the configured region identifier across switches that should share MST instance mapping. It is useful when two switches with the same VLAN mapping still appear in different MST regions. Here the design needs superior BPDU evidence; this choice instead solves an adjacent problem.
  3. port cost tuning is meant to influence which redundant path becomes the root path without changing the root bridge. Use it when the root is correct but traffic should use a different uplink as the normal forwarding path. This stem calls for superior BPDU evidence; port cost tuning addresses another operational need.
  4. RSTP alternate port works by receives superior BPDUs on a redundant path and remains discarding until needed. It fits where a switch has a second path to the root that should not forward during normal operation. The required function here is superior BPDU evidence, so this option targets the wrong condition.

 

Question 18

Two adjacent switches intentionally belong to different regions, but the current design is not providing the expected result. The production operations group wants a component that treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. Which change should be made? Choose ONE.

  1. MST boundary port
  2. MST revision number
  3. port priority tie breaker
  4. RSTP edge port

Correct Answer(s)

 

A

Rationale

  1. Choose MST boundary port. Its function is to treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. Here the required outcome is to identify a port connecting an MST region to a different region or spanning-tree mode. This capability places MST boundary port at the proper layer; alternatives do not.
  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 MST boundary port; this choice instead solves an adjacent problem.
  3. port priority tie breaker works by adjusts the port identifier component used after root-path costs tie. It fits where parallel links have equal path cost and the engineer needs deterministic selection. The required function here is MST boundary port, so this option targets the wrong condition.
  4. RSTP edge port belongs where a workstation or server link should become usable quickly and is not intended to connect another switch. It helps to allow an end-host-facing port to transition rapidly without waiting for normal topology convergence. The stem instead requires MST boundary port, so RSTP edge port does not meet the decisive condition.

 

Question 19

An engineer is considering hiding bpdus on a switch-to-switch link to stop topology changes, but the current design is not providing the expected result. The platform team wants a component that prevents normal BPDU processing and can create dangerous silent loops if misapplied. Which change should be made? Choose ONE.

  1. MST VLAN-to-instance mapping
  2. superior BPDU evidence
  3. BPDU filtering risk awareness
  4. BPDU Guard

Correct Answer(s)

 

C

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 BPDU filtering risk awareness; this choice instead solves an adjacent problem.
  2. The role of superior BPDU evidence is to recognize that a neighbor advertises a better root or path than the local switch. It is useful when a protection feature triggers and the engineer must confirm the cause is a superior spanning-tree advertisement. Here the design needs BPDU filtering risk awareness; this choice instead solves an adjacent problem.
  3. Choose BPDU filtering risk awareness. Its function is to prevents normal BPDU processing and can create dangerous silent loops if misapplied. Here the required outcome is to understand that suppressing BPDUs can remove loop-detection visibility and must not replace guard features casually. This capability places BPDU filtering risk awareness at the proper layer; alternatives do not.
  4. BPDU Guard belongs where an access port must fail closed when someone connects a bridge or switch. It helps to shut or err-disable an edge access port if a BPDU is received. The stem instead requires BPDU filtering risk awareness, so BPDU Guard does not meet the decisive condition.

 

Question 20

A switch link remains slow to converge because it is not operating with appropriate rstp link semantics, but the current design is not providing the expected result. The network operations group wants a component that treats the link as point-to-point so proposal/agreement can operate as designed. Which change should be made? Choose ONE.

  1. consistent point-to-point link type
  2. MST Instance 0 IST
  3. MST boundary port
  4. Root Guard

Correct Answer(s)

 

A

Rationale

  1. Choose consistent point-to-point link type. Its function is to treats the link as point-to-point so proposal/agreement can operate as designed. Here the required outcome is to enable RSTP rapid transition behavior on suitable full-duplex links. This capability places consistent point-to-point link type at the proper layer; alternatives do not.
  2. 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 consistent point-to-point link type, so this option targets the wrong condition.
  3. MST boundary port works by treats external topology through the CIST rather than exchanging internal MSTI detail across the boundary. It fits where two adjacent switches intentionally belong to different regions. The required function here is consistent point-to-point link type, so this option targets the wrong condition.
  4. Root Guard works by places the port in a root-inconsistent state when superior BPDUs arrive and recovers when they stop. It fits where the network design must keep the root bridge in the distribution/core layer. The required function here is consistent point-to-point link type, so this option targets the wrong condition.

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