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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 22

Question 210

During acceptance testing after confirm VLAN 50 is active locally and permitted by the trunk., which evidence is most relevant?

  1. The interface reports static access mode in the intended VLAN.
  2. `show interfaces trunk` shows only the approved active VLAN set.
  3. Native VLAN and allowed VLAN match at both ends in interface output.
  4. `show interfaces trunk` lists VLAN 50 as both allowed and forwarding.

Explanation

Correct Answer

D:

`show interfaces trunk` lists VLAN 50 as both allowed and forwarding. This is the targeted operational evidence for the change. Allowed VLAN and active VLAN are separate checks for trunk forwarding. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Set access mode and the correct access VLAN on that port. A user edge should not accept arbitrary VLAN tagging from a normal host. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Prune the trunk allowed VLAN list to only required VLAN IDs. Reducing propagated VLANs limits unintended L2 reachability. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Audit native-VLAN and tagged-VLAN configuration together. VLAN numbering alone does not establish consistent untagged traffic mapping. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 211

An access port is accidentally configured as a trunk to a workstation. What is the most appropriate corrective measure?

  1. Correct mismatched 802.1Q encapsulation or port mode on both endpoints.
  2. Disable DTP negotiation using `switchport nonegotiate` where supported.
  3. Set access mode and the correct access VLAN on that port.
  4. Allow management VLAN 99 on the required trunk path.

Explanation

Correct Answer

C:

A user edge should not accept arbitrary VLAN tagging from a normal host. The most direct remediation is set access mode and the correct access VLAN on that port. A practical acceptance test is the interface reports static access mode in the intended VLAN. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A trunk is up but every frame from a new site is being dropped. Both ends need compatible encapsulation and operational trunk state. It does not specifically correct the issue here: an access port is accidentally configured as a trunk to a workstation.

B:

This choice addresses a different situation: A static trunk to an untrusted neighboring switch still emits DTP negotiation frames. Suppressing DTP on an intentional static trunk prevents negotiation messages at that trust boundary. It does not specifically correct the issue here: an access port is accidentally configured as a trunk to a workstation.

D:

This choice addresses a different situation: An uplink is configured to carry only VLAN 20 but the management SVI uses VLAN 99. SVI reachability depends on VLAN continuity across the physical trunk. It does not specifically correct the issue here: an access port is accidentally configured as a trunk to a workstation.

Question 212

An operator has applied the following change: set access mode and the correct access VLAN on that port. Which observation best confirms it works?

  1. Tagged VLAN frames traverse the link with identical VLAN IDs.
  2. The interface reports static access mode in the intended VLAN.
  3. The port remains statically trunking while DTP negotiation frames stop.
  4. Layer-2 path forwards tagged VLAN 99 and management gateway becomes reachable.

Explanation

Correct Answer

B:

The interface reports static access mode in the intended VLAN. This is the targeted operational evidence for the change. A user edge should not accept arbitrary VLAN tagging from a normal host. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Correct mismatched 802.1Q encapsulation or port mode on both endpoints. Both ends need compatible encapsulation and operational trunk state. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Disable DTP negotiation using `switchport nonegotiate` where supported. Suppressing DTP on an intentional static trunk prevents negotiation messages at that trust boundary. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Allow management VLAN 99 on the required trunk path. SVI reachability depends on VLAN continuity across the physical trunk. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 213

A trunk is up but every frame from a new site is being dropped. Which action most directly addresses this situation?

  1. Correct mismatched 802.1Q encapsulation or port mode on both endpoints.
  2. Prune the trunk allowed VLAN list to only required VLAN IDs.
  3. Audit native-VLAN and tagged-VLAN configuration together.
  4. Inspect the per-VLAN spanning tree forwarding state before changing trunk encapsulation.

Explanation

Correct Answer

A:

Both ends need compatible encapsulation and operational trunk state. The most direct remediation is correct mismatched 802.1Q encapsulation or port mode on both endpoints. A practical acceptance test is tagged VLAN frames traverse the link with identical VLAN IDs. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A security team wants to stop unneeded VLANs traversing a distribution link. Reducing propagated VLANs limits unintended L2 reachability. It does not specifically correct the issue here: a trunk is up but every frame from a new site is being dropped.

C:

This choice addresses a different situation: Two switches use the same VLAN numbering but a native VLAN change leaked traffic. VLAN numbering alone does not establish consistent untagged traffic mapping. It does not specifically correct the issue here: a trunk is up but every frame from a new site is being dropped.

D:

This choice addresses a different situation: A trunk appears up but spanning tree blocks VLAN 40. Link state does not ensure every VLAN is STP forwarding. It does not specifically correct the issue here: a trunk is up but every frame from a new site is being dropped.

Question 214

After implementing correct mismatched 802.1Q encapsulation or port mode on both endpoints., which operational evidence should an engineer collect?

  1. `show interfaces trunk` shows only the approved active VLAN set.
  2. Native VLAN and allowed VLAN match at both ends in interface output.
  3. The VLAN 40 interface state transitions to forwarding where appropriate.
  4. Tagged VLAN frames traverse the link with identical VLAN IDs.

Explanation

Correct Answer

D:

Tagged VLAN frames traverse the link with identical VLAN IDs. This is the targeted operational evidence for the change. Both ends need compatible encapsulation and operational trunk state. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Prune the trunk allowed VLAN list to only required VLAN IDs. Reducing propagated VLANs limits unintended L2 reachability. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Audit native-VLAN and tagged-VLAN configuration together. VLAN numbering alone does not establish consistent untagged traffic mapping. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Inspect the per-VLAN spanning tree forwarding state before changing trunk encapsulation. Link state does not ensure every VLAN is STP forwarding. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 215

A security team wants to stop unneeded VLANs traversing a distribution link. What is the most effective configuration or design response?

  1. Disable DTP negotiation using `switchport nonegotiate` where supported.
  2. Allow management VLAN 99 on the required trunk path.
  3. Prune the trunk allowed VLAN list to only required VLAN IDs.
  4. Make member interface speeds and duplex settings compatible.

Explanation

Correct Answer

C:

Reducing propagated VLANs limits unintended L2 reachability. The most direct remediation is prune the trunk allowed VLAN list to only required VLAN IDs. A practical acceptance test is `show interfaces trunk` shows only the approved active VLAN set. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A static trunk to an untrusted neighboring switch still emits DTP negotiation frames. Suppressing DTP on an intentional static trunk prevents negotiation messages at that trust boundary. It does not specifically correct the issue here: a security team wants to stop unneeded VLANs traversing a distribution link.

B:

This choice addresses a different situation: An uplink is configured to carry only VLAN 20 but the management SVI uses VLAN 99. SVI reachability depends on VLAN continuity across the physical trunk. It does not specifically correct the issue here: a security team wants to stop unneeded VLANs traversing a distribution link.

D:

This choice addresses a different situation: A switch EtherChannel bundle is suspended after connecting links with inconsistent speeds. Bundling requires compatible physical and Layer-2 parameters. It does not specifically correct the issue here: a security team wants to stop unneeded VLANs traversing a distribution link.

Question 216

The change request says: prune the trunk allowed VLAN list to only required VLAN IDs. Which verification result is most decisive?

  1. The port remains statically trunking while DTP negotiation frames stop.
  2. `show interfaces trunk` shows only the approved active VLAN set.
  3. Layer-2 path forwards tagged VLAN 99 and management gateway becomes reachable.
  4. `show etherchannel summary` reports all intended members bundled.

Explanation

Correct Answer

B:

`show interfaces trunk` shows only the approved active VLAN set. This is the targeted operational evidence for the change. Reducing propagated VLANs limits unintended L2 reachability. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Disable DTP negotiation using `switchport nonegotiate` where supported. Suppressing DTP on an intentional static trunk prevents negotiation messages at that trust boundary. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Allow management VLAN 99 on the required trunk path. SVI reachability depends on VLAN continuity across the physical trunk. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Make member interface speeds and duplex settings compatible. Bundling requires compatible physical and Layer-2 parameters. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 217

A static trunk to an untrusted neighboring switch still emits DTP negotiation frames. Which change should the network engineer prioritize?

  1. Disable DTP negotiation using `switchport nonegotiate` where supported.
  2. Audit native-VLAN and tagged-VLAN configuration together.
  3. Inspect the per-VLAN spanning tree forwarding state before changing trunk encapsulation.
  4. Use compatible LACP active/passive modes on both peers.

Explanation

Correct Answer

A:

Suppressing DTP on an intentional static trunk prevents negotiation messages at that trust boundary. The most direct remediation is disable DTP negotiation using `switchport nonegotiate` where supported. A practical acceptance test is the port remains statically trunking while DTP negotiation frames stop. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: Two switches use the same VLAN numbering but a native VLAN change leaked traffic. VLAN numbering alone does not establish consistent untagged traffic mapping. It does not specifically correct the issue here: a static trunk to an untrusted neighboring switch still emits DTP negotiation frames.

C:

This choice addresses a different situation: A trunk appears up but spanning tree blocks VLAN 40. Link state does not ensure every VLAN is STP forwarding. It does not specifically correct the issue here: a static trunk to an untrusted neighboring switch still emits DTP negotiation frames.

D:

This choice addresses a different situation: One side uses LACP active and the other side is configured static `on`. An unmanaged static bundle cannot negotiate with a dynamic LACP peer. It does not specifically correct the issue here: a static trunk to an untrusted neighboring switch still emits DTP negotiation frames.

Question 218

A post-change test follows this action: disable DTP negotiation using `switchport nonegotiate` where supported. Which result demonstrates success?

  1. Native VLAN and allowed VLAN match at both ends in interface output.
  2. The VLAN 40 interface state transitions to forwarding where appropriate.
  3. The channel summary shows LACP and member links marked bundled.
  4. The port remains statically trunking while DTP negotiation frames stop.

Explanation

Correct Answer

D:

The port remains statically trunking while DTP negotiation frames stop. This is the targeted operational evidence for the change. Suppressing DTP on an intentional static trunk prevents negotiation messages at that trust boundary. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Audit native-VLAN and tagged-VLAN configuration together. VLAN numbering alone does not establish consistent untagged traffic mapping. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Inspect the per-VLAN spanning tree forwarding state before changing trunk encapsulation. Link state does not ensure every VLAN is STP forwarding. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use compatible LACP active/passive modes on both peers. An unmanaged static bundle cannot negotiate with a dynamic LACP peer. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 219

Two switches use the same VLAN numbering but a native VLAN change leaked traffic. Which remediation best resolves the described symptom?

  1. Allow management VLAN 99 on the required trunk path.
  2. Make member interface speeds and duplex settings compatible.
  3. Audit native-VLAN and tagged-VLAN configuration together.
  4. Make at least one side LACP active.

Explanation

Correct Answer

C:

VLAN numbering alone does not establish consistent untagged traffic mapping. The most direct remediation is audit native-VLAN and tagged-VLAN configuration together. A practical acceptance test is native VLAN and allowed VLAN match at both ends in interface output. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An uplink is configured to carry only VLAN 20 but the management SVI uses VLAN 99. SVI reachability depends on VLAN continuity across the physical trunk. It does not specifically correct the issue here: two switches use the same VLAN numbering but a native VLAN change leaked traffic.

B:

This choice addresses a different situation: A switch EtherChannel bundle is suspended after connecting links with inconsistent speeds. Bundling requires compatible physical and Layer-2 parameters. It does not specifically correct the issue here: two switches use the same VLAN numbering but a native VLAN change leaked traffic.

D:

This choice addresses a different situation: Both EtherChannel endpoints use LACP passive and no bundle forms. Two passive participants never initiate LACP negotiation. It does not specifically correct the issue here: two switches use the same VLAN numbering but a native VLAN change leaked traffic.

Question 220

During acceptance testing after audit native-VLAN and tagged-VLAN configuration together., which evidence is most relevant?

  1. Layer-2 path forwards tagged VLAN 99 and management gateway becomes reachable.
  2. Native VLAN and allowed VLAN match at both ends in interface output.
  3. `show etherchannel summary` reports all intended members bundled.
  4. Partner information appears and the port channel becomes operational.

Explanation

Correct Answer

B:

Native VLAN and allowed VLAN match at both ends in interface output. This is the targeted operational evidence for the change. VLAN numbering alone does not establish consistent untagged traffic mapping. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Allow management VLAN 99 on the required trunk path. SVI reachability depends on VLAN continuity across the physical trunk. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Make member interface speeds and duplex settings compatible. Bundling requires compatible physical and Layer-2 parameters. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Make at least one side LACP active. Two passive participants never initiate LACP negotiation. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

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