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350-401 Premium File: 763 Questions & Answers

Last Update: Oct 20, 2026

350-401 Training Course: 196 Video Lectures

350-401 PDF Study Guide: 636 Pages

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350-401 Bundle gives you unlimited access to "350-401" files. However, this does not replace the need for a .vce exam simulator. To download your .vce exam simulator click here

Cisco 350-401 Practice Test 27

Question 260

A network engineer expects two links configured in PAgP desirable and LACP active to aggregate into a common port-channel. During troubleshooting: Both interfaces are up individually but no port-channel forms. Which underlying cause best explains the recorded behavior?

  1. Two LACP passive peers never initiate the negotiation needed to form the bundle.
  2. The member's trunk/VLAN configuration is incompatible with the aggregated channel settings.
  3. The load-balance hash has too little entropy for the observed traffic patterns.
  4. The peers use incompatible EtherChannel negotiation protocols.

Explanation

Correct Answer

D:

The actual technical cause is: The peers use incompatible EtherChannel negotiation protocols. It specifically explains the observation: both interfaces are up individually but no port-channel forms. The correcting configuration is: configure compatible EtherChannel negotiation protocol and modes at both peers rather than mixing LACP and PAgP.

Incorrect Answers

A:

That diagnosis is supported by a different symptom: One link is individual despite physical link-up when both peers switch to passive mode. Here the recorded observation is: both interfaces are up individually but no port-channel forms. The applicable cause is: the peers use incompatible EtherChannel negotiation protocols.

B:

That diagnosis is supported by a different symptom: The port-channel remains up but one physical link is excluded from the bundle. Here the recorded observation is: both interfaces are up individually but no port-channel forms. The applicable cause is: the peers use incompatible EtherChannel negotiation protocols.

C:

That diagnosis is supported by a different symptom: Many sessions all map to one member because the chosen hash input is nearly constant for those conversations. Here the recorded observation is: both interfaces are up individually but no port-channel forms. The applicable cause is: the peers use incompatible EtherChannel negotiation protocols.

Question 261

A network engineer expects two links configured in PAgP desirable and LACP active to aggregate into a common port-channel. The initial change is: Configure compatible EtherChannel negotiation protocol and modes at both peers rather than mixing LACP and PAgP. Which continuing control most directly prevents a recurrence of the documented problem: Both interfaces are up individually but no port-channel forms.

  1. Document active EtherChannel protocol per link and run compatibility checks on both ends.
  2. Validate active/passive negotiation and VLAN, speed and duplex consistency before changes.
  3. Set minimum-links policy to the real throughput and availability objective and test reductions.
  4. Apply Layer 2 changes to port-channel interfaces and validate members' consistency.

Explanation

Correct Answer

A:

The continuing protective control is: Document active EtherChannel protocol per link and run compatibility checks on both ends. This addresses the underlying failure mechanism: the peers use incompatible EtherChannel negotiation protocols. The corresponding operational check is: check negotiated protocol and channel summary on both sides for correctly bundled links.

Incorrect Answers

B:

That control reduces a separate risk: Two LACP passive peers never initiate the negotiation needed to form the bundle. For the described design, the recurring risk arises from: the peers use incompatible EtherChannel negotiation protocols. The specific required safeguard is: document active EtherChannel protocol per link and run compatibility checks on both ends.

C:

That control reduces a separate risk: The EtherChannel minimum-links threshold is stricter than the planned single-member failover. For the described design, the recurring risk arises from: the peers use incompatible EtherChannel negotiation protocols. The specific required safeguard is: document active EtherChannel protocol per link and run compatibility checks on both ends.

D:

That control reduces a separate risk: The member's trunk/VLAN configuration is incompatible with the aggregated channel settings. For the described design, the recurring risk arises from: the peers use incompatible EtherChannel negotiation protocols. The specific required safeguard is: document active EtherChannel protocol per link and run compatibility checks on both ends.

Question 262

A data center EtherChannel hashes one large TCP flow onto one physical link while overall bundle bandwidth is greater. The incident evidence is: A single backup TCP session never exceeds one member link speed. Which targeted configuration or design change best addresses the failure?

  1. Make physical member switchport settings consistent with the port-channel configuration.
  2. Use a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy.
  3. Explain the per-flow load-balancing hash and distribute independent flows; do not promise packet-by-packet striping of one flow.
  4. Select and test a supported load-balance hash including useful source/destination fields for the actual traffic mix.

Explanation

Correct Answer

C:

The required correction is: Explain the per-flow load-balancing hash and distribute independent flows; do not promise packet-by-packet striping of one flow. The underlying failure mechanism is: EtherChannel flow hashing pins that flow to one member, not aggregate throughput of all links. Verify success by carrying out this direct test: inspect per-member counters with one flow and several distinct flows to confirm hash distribution.

Incorrect Answers

A:

Making physical member switchport settings consistent with the port-channel configuration would not explain the per-flow load-balancing hash and distribute independent flows.

B:

Using a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy would not explain the per-flow load-balancing hash and distribute independent flows.

D:

Selecting and testing a supported load-balance hash including useful source/destination fields for the actual traffic mix would not explain the per-flow load-balancing hash and distribute independent flows.

Question 263

A data center EtherChannel hashes one large TCP flow onto one physical link while overall bundle bandwidth is greater. The proposed remedy is: Explain the per-flow load-balancing hash and distribute independent flows; do not promise packet-by-packet striping of one flow. Which observation would most directly confirm that remedy works as intended?

  1. Compare per-member traffic before/after hash changes using distinct hosts and ports.
  2. Inspect `show etherchannel summary` and forwarding through the surviving member under link-failure test.
  3. Inspect per-member counters with one flow and several distinct flows to confirm hash distribution.
  4. Inspect the EtherChannel consistency reason and verify suspended members rejoin after restoring common settings.

Explanation

Correct Answer

C:

The decisive acceptance observation is: Inspect per-member counters with one flow and several distinct flows to confirm hash distribution. This tests the working mechanism, while the original incident was: a single backup TCP session never exceeds one member link speed.

Incorrect Answers

A:

This test measures a different behavior: Compare per-member traffic before/after hash changes using distinct hosts and ports. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect per-member counters with one flow and several distinct flows to confirm hash distribution.

B:

This test measures a different behavior: Inspect `show etherchannel summary` and forwarding through the surviving member under link-failure test. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect per-member counters with one flow and several distinct flows to confirm hash distribution.

D:

This test measures a different behavior: Inspect the EtherChannel consistency reason and verify suspended members rejoin after restoring common settings. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect per-member counters with one flow and several distinct flows to confirm hash distribution.

Question 264

A data center EtherChannel hashes one large TCP flow onto one physical link while overall bundle bandwidth is greater. During troubleshooting: A single backup TCP session never exceeds one member link speed. Which underlying cause best explains the recorded behavior?

  1. EtherChannel flow hashing pins that flow to one member, not aggregate throughput of all links.
  2. The member's trunk/VLAN configuration is incompatible with the aggregated channel settings.
  3. The load-balance hash has too little entropy for the observed traffic patterns.
  4. The EtherChannel minimum-links threshold is stricter than the planned single-member failover.

Explanation

Correct Answer

A:

The actual technical cause is: EtherChannel flow hashing pins that flow to one member, not aggregate throughput of all links. It specifically explains the observation: a single backup TCP session never exceeds one member link speed. The correcting configuration is: explain the per-flow load-balancing hash and distribute independent flows; do not promise packet-by-packet striping of one flow.

Incorrect Answers

B:

That diagnosis is supported by a different symptom: The port-channel remains up but one physical link is excluded from the bundle. Here the recorded observation is: a single backup TCP session never exceeds one member link speed. The applicable cause is: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links.

C:

That diagnosis is supported by a different symptom: Many sessions all map to one member because the chosen hash input is nearly constant for those conversations. Here the recorded observation is: a single backup TCP session never exceeds one member link speed. The applicable cause is: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links.

D:

That diagnosis is supported by a different symptom: The whole logical interface drops because its configured minimum active member count exceeds the remaining links. Here the recorded observation is: a single backup TCP session never exceeds one member link speed. The applicable cause is: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links.

Question 265

A data center EtherChannel hashes one large TCP flow onto one physical link while overall bundle bandwidth is greater. The initial change is: Explain the per-flow load-balancing hash and distribute independent flows; do not promise packet-by-packet striping of one flow. Which continuing control most directly prevents a recurrence of the documented problem: A single backup TCP session never exceeds one member link speed.

  1. Set minimum-links policy to the real throughput and availability objective and test reductions.
  2. Reassess EtherChannel hashing when flow mixes or uplink topologies change.
  3. Capacity-plan single-flow demands separately from total EtherChannel bundle capacity.
  4. Apply Layer 2 changes to port-channel interfaces and validate members' consistency.

Explanation

Correct Answer

C:

The continuing protective control is: Capacity-plan single-flow demands separately from total EtherChannel bundle capacity. This addresses the underlying failure mechanism: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links. The corresponding operational check is: inspect per-member counters with one flow and several distinct flows to confirm hash distribution.

Incorrect Answers

A:

That control reduces a separate risk: The EtherChannel minimum-links threshold is stricter than the planned single-member failover. For the described design, the recurring risk arises from: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links. The specific required safeguard is: capacity-plan single-flow demands separately from total EtherChannel bundle capacity.

B:

That control reduces a separate risk: The load-balance hash has too little entropy for the observed traffic patterns. For the described design, the recurring risk arises from: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links. The specific required safeguard is: capacity-plan single-flow demands separately from total EtherChannel bundle capacity.

D:

That control reduces a separate risk: The member's trunk/VLAN configuration is incompatible with the aggregated channel settings. For the described design, the recurring risk arises from: etherChannel flow hashing pins that flow to one member, not aggregate throughput of all links. The specific required safeguard is: capacity-plan single-flow demands separately from total EtherChannel bundle capacity.

Question 266

An LACP port-channel sees a member hot while another member carries almost no traffic across many conversations. The incident evidence is: Many sessions all map to one member because the chosen hash input is nearly constant for those conversations. Which targeted configuration or design change best addresses the failure?

  1. Select and test a supported load-balance hash including useful source/destination fields for the actual traffic mix.
  2. Use a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy.
  3. Retain at least one LACP active participant and match the channel group parameters and port attributes.
  4. Make physical member switchport settings consistent with the port-channel configuration.

Explanation

Correct Answer

A:

The required correction is: Select and test a supported load-balance hash including useful source/destination fields for the actual traffic mix. The underlying failure mechanism is: The load-balance hash has too little entropy for the observed traffic patterns. Verify success by carrying out this direct test: compare per-member traffic before/after hash changes using distinct hosts and ports.

Incorrect Answers

B:

Using a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy would not meet the need for and test a supported load-balance hash including useful source/destination fields for the actual traffic mix.

C:

Retaining at least one LACP active participant and matching the channel group parameters and port attributes would not meet the need for and test a supported load-balance hash including useful source/destination fields for the actual traffic mix.

D:

Making physical member switchport settings consistent with the port-channel configuration would not meet the need for and test a supported load-balance hash including useful source/destination fields for the actual traffic mix.

Question 267

An LACP port-channel sees a member hot while another member carries almost no traffic across many conversations. The proposed remedy is: Select and test a supported load-balance hash including useful source/destination fields for the actual traffic mix. Which observation would most directly confirm that remedy works as intended?

  1. Inspect the EtherChannel consistency reason and verify suspended members rejoin after restoring common settings.
  2. Inspect `show etherchannel summary` and forwarding through the surviving member under link-failure test.
  3. Compare per-member traffic before/after hash changes using distinct hosts and ports.
  4. Check `show etherchannel summary` shows bundled P members and the expected LACP neighbor.

Explanation

Correct Answer

C:

The decisive acceptance observation is: Compare per-member traffic before/after hash changes using distinct hosts and ports. This tests the working mechanism, while the original incident was: many sessions all map to one member because the chosen hash input is nearly constant for those conversations.

Incorrect Answers

A:

This test measures a different behavior: Inspect the EtherChannel consistency reason and verify suspended members rejoin after restoring common settings. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare per-member traffic before/after hash changes using distinct hosts and ports.

B:

This test measures a different behavior: Inspect `show etherchannel summary` and forwarding through the surviving member under link-failure test. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare per-member traffic before/after hash changes using distinct hosts and ports.

D:

This test measures a different behavior: Check `show etherchannel summary` shows bundled P members and the expected LACP neighbor. It does not establish the target outcome. For the documented fault, the direct acceptance test is: compare per-member traffic before/after hash changes using distinct hosts and ports.

Question 268

An LACP port-channel sees a member hot while another member carries almost no traffic across many conversations. During troubleshooting: Many sessions all map to one member because the chosen hash input is nearly constant for those conversations. Which underlying cause best explains the recorded behavior?

  1. The EtherChannel minimum-links threshold is stricter than the planned single-member failover.
  2. The member's trunk/VLAN configuration is incompatible with the aggregated channel settings.
  3. Two LACP passive peers never initiate the negotiation needed to form the bundle.
  4. The load-balance hash has too little entropy for the observed traffic patterns.

Explanation

Correct Answer

D:

The actual technical cause is: The load-balance hash has too little entropy for the observed traffic patterns. It specifically explains the observation: many sessions all map to one member because the chosen hash input is nearly constant for those conversations. The correcting configuration is: select and test a supported load-balance hash including useful source/destination fields for the actual traffic mix.

Incorrect Answers

A:

That diagnosis is supported by a different symptom: The whole logical interface drops because its configured minimum active member count exceeds the remaining links. Here the recorded observation is: many sessions all map to one member because the chosen hash input is nearly constant for those conversations. The applicable cause is: the load-balance hash has too little entropy for the observed traffic patterns.

B:

That diagnosis is supported by a different symptom: The port-channel remains up but one physical link is excluded from the bundle. Here the recorded observation is: many sessions all map to one member because the chosen hash input is nearly constant for those conversations. The applicable cause is: the load-balance hash has too little entropy for the observed traffic patterns.

C:

That diagnosis is supported by a different symptom: One link is individual despite physical link-up when both peers switch to passive mode. Here the recorded observation is: many sessions all map to one member because the chosen hash input is nearly constant for those conversations. The applicable cause is: the load-balance hash has too little entropy for the observed traffic patterns.

Question 269

An LACP port-channel sees a member hot while another member carries almost no traffic across many conversations. The initial change is: Select and test a supported load-balance hash including useful source/destination fields for the actual traffic mix. Which continuing control most directly prevents a recurrence of the documented problem: Many sessions all map to one member because the chosen hash input is nearly constant for those conversations.

  1. Document active EtherChannel protocol per link and run compatibility checks on both ends.
  2. Apply Layer 2 changes to port-channel interfaces and validate members' consistency.
  3. Reassess EtherChannel hashing when flow mixes or uplink topologies change.
  4. Set minimum-links policy to the real throughput and availability objective and test reductions.

Explanation

Correct Answer

C:

The continuing protective control is: Reassess EtherChannel hashing when flow mixes or uplink topologies change. This addresses the underlying failure mechanism: the load-balance hash has too little entropy for the observed traffic patterns. The corresponding operational check is: compare per-member traffic before/after hash changes using distinct hosts and ports.

Incorrect Answers

A:

That control reduces a separate risk: The peers use incompatible EtherChannel negotiation protocols. For the described design, the recurring risk arises from: the load-balance hash has too little entropy for the observed traffic patterns. The specific required safeguard is: reassess EtherChannel hashing when flow mixes or uplink topologies change.

B:

That control reduces a separate risk: The member's trunk/VLAN configuration is incompatible with the aggregated channel settings. For the described design, the recurring risk arises from: the load-balance hash has too little entropy for the observed traffic patterns. The specific required safeguard is: reassess EtherChannel hashing when flow mixes or uplink topologies change.

D:

That control reduces a separate risk: The EtherChannel minimum-links threshold is stricter than the planned single-member failover. For the described design, the recurring risk arises from: the load-balance hash has too little entropy for the observed traffic patterns. The specific required safeguard is: reassess EtherChannel hashing when flow mixes or uplink topologies change.

Question 270

One member of an EtherChannel is disabled by a link failure but the bundle should remain usable through the surviving member. The incident evidence is: The whole logical interface drops because its configured minimum active member count exceeds the remaining links. Which targeted configuration or design change best addresses the failure?

  1. Make physical member switchport settings consistent with the port-channel configuration.
  2. Configure compatible EtherChannel negotiation protocol and modes at both peers rather than mixing LACP and PAgP.
  3. Explain the per-flow load-balancing hash and distribute independent flows; do not promise packet-by-packet striping of one flow.
  4. Use a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy.

Explanation

Correct Answer

D:

The required correction is: Use a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy. The underlying failure mechanism is: The EtherChannel minimum-links threshold is stricter than the planned single-member failover. Verify success by carrying out this direct test: inspect `show etherchannel summary` and forwarding through the surviving member under link-failure test.

Incorrect Answers

A:

Making physical member switchport settings consistent with the port-channel configuration would not meet the need for a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy.

B:

Configuring compatible EtherChannel negotiation protocol and modes at both peers rather than mixing LACP and PAgP would not meet the need for a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy.

C:

Explaining the per-flow load-balancing hash and distributing independent flows would not meet the need for a supported port-channel with acceptable minimum-link requirements for the intended redundancy policy.


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