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Exam Code: 350-801
Exam Name: Implementing Cisco Collaboration Core Technologies (CLCOR)
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Implementing Cisco Collaboration Core Technologies (CLCOR) 350-801 Practice Test 40

Question 390

For this Cisco collaboration incident — A switch uplink receives traffic from a trusted aggregation router but remarking at the uplink alters service classes. — what test result most directly establishes that the corrective work succeeded?

  1. Voice RTP uses the intended hardware queue while unrelated VLAN data is not elevated.
  2. Upstream and downstream captures show matching approved media and signaling classes.
  3. Packets leaving the switch retain the approved media marking while untrusted data does not.
  4. Under congestion the strict-priority class sees bounded latency without starving data.

Explanation

Correct Answer

B:

A trust boundary should be placed according to actual administrative control and packet provenance. This is decisive because the expected outcome is: Upstream and downstream captures show matching approved media and signaling classes.

Incorrect Answers

A:

“Voice RTP uses the intended hardware queue while unrelated VLAN data is not elevated” evaluates VLAN separation does not by itself establish QoS classification, marking or scheduling. It would not confirm the collaboration outcome requiring a trust boundary should be placed according to actual administrative control and packet provenance.

C:

“Packets leaving the switch retain the approved media marking while untrusted data does not” evaluates the access layer is responsible for preserving and controlling QoS marking legitimacy. It would not confirm the collaboration outcome requiring a trust boundary should be placed according to actual administrative control and packet provenance.

D:

“Under congestion the strict-priority class sees bounded latency without starving data” evaluates lLQ scheduling follows the queue configuration in the policy-map, not classification alone. It would not confirm the collaboration outcome requiring a trust boundary should be placed according to actual administrative control and packet provenance.

Question 391

During a collaboration systems review, the following is documented: A voice VLAN is configured but operators assume that VLAN membership automatically grants a high-priority queue. Which response should engineers prioritize?

  1. Apply the intended phone-facing trust or classification policy at the verified access boundary.
  2. Define the QoS trust behavior appropriate to the controlled uplink and validate class-to-class mapping.
  3. Classify authorized voice packets and explicitly verify DSCP/CoS-to-queue mapping on the switch.
  4. Align WLAN multimedia access categories and supported QoS markings with the wired end-to-end policy.

Explanation

Correct Answer

C:

VLAN separation does not by itself establish QoS classification, marking or scheduling. Apply the specific remedy: Classify authorized voice packets and explicitly verify DSCP/CoS-to-queue mapping on the switch. Verify it by checking: Voice RTP uses the intended hardware queue while unrelated VLAN data is not elevated.

Incorrect Answers

A:

“Apply the intended phone-facing trust or classification policy at the verified access boundary” concerns the access layer is responsible for preserving and controlling QoS marking legitimacy. The stated collaboration requirement instead depends on VLAN separation does not by itself establish QoS classification, marking or scheduling.

B:

“Define the QoS trust behavior appropriate to the controlled uplink and validate class-to-class mapping” concerns a trust boundary should be placed according to actual administrative control and packet provenance. The stated collaboration requirement instead depends on VLAN separation does not by itself establish QoS classification, marking or scheduling.

D:

“Align WLAN multimedia access categories and supported QoS markings with the wired end-to-end policy” concerns wireless WMM queues and wired DSCP treatment must map coherently across the access boundary. The stated collaboration requirement instead depends on VLAN separation does not by itself establish QoS classification, marking or scheduling.

Question 392

A Cisco collaboration operations team is closing a ticket for this requirement: A voice VLAN is configured but operators assume that VLAN membership automatically grants a high-priority queue. Which result provides the strongest verification?

  1. Packets leaving the switch retain the approved media marking while untrusted data does not.
  2. Upstream and downstream captures show matching approved media and signaling classes.
  3. Voice RTP uses the intended hardware queue while unrelated VLAN data is not elevated.
  4. The corrected path maintains expected SIP transactions and calls no longer release at the timeout.

Explanation

Correct Answer

C:

VLAN separation does not by itself establish QoS classification, marking or scheduling. This is decisive because the expected outcome is: Voice RTP uses the intended hardware queue while unrelated VLAN data is not elevated.

Incorrect Answers

A:

“Packets leaving the switch retain the approved media marking while untrusted data does not” evaluates the access layer is responsible for preserving and controlling QoS marking legitimacy. It would not confirm the collaboration outcome requiring VLAN separation does not by itself establish QoS classification, marking or scheduling.

B:

“Upstream and downstream captures show matching approved media and signaling classes” evaluates a trust boundary should be placed according to actual administrative control and packet provenance. It would not confirm the collaboration outcome requiring VLAN separation does not by itself establish QoS classification, marking or scheduling.

D:

“The corrected path maintains expected SIP transactions and calls no longer release at the timeout” evaluates a reproducible 30-second release can be a signaling transaction or ACK problem rather than packet-loss-only QoS. It would not confirm the collaboration outcome requiring VLAN separation does not by itself establish QoS classification, marking or scheduling.

Question 393

During a collaboration systems review, the following is documented: A WAN router needs to identify RTP audio packets already marked with DSCP EF. Which response should engineers prioritize?

  1. Attach the intended service-policy in the correct direction on the actual congested egress interface.
  2. Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination.
  3. Create an IOS XE class-map matching the approved EF media traffic.
  4. Classify audio media into an appropriate expedited forwarding class and preserve a controlled priority queue.

Explanation

Correct Answer

C:

Class maps select packets for subsequent policy-map treatment using defined match criteria. Apply the specific remedy: Create an IOS XE class-map matching the approved EF media traffic. Verify it by checking: Policy counters increment for test audio packets and not for unrelated data.

Incorrect Answers

A:

“Attach the intended service-policy in the correct direction on the actual congested egress interface” concerns a defined policy-map has no forwarding effect until attached to a supported interface/direction. The stated collaboration requirement instead depends on class maps select packets for subsequent policy-map treatment using defined match criteria.

B:

“Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination” concerns low-latency queuing needs capacity control as well as preferential service. The stated collaboration requirement instead depends on class maps select packets for subsequent policy-map treatment using defined match criteria.

D:

“Classify audio media into an appropriate expedited forwarding class and preserve a controlled priority queue” concerns real-time audio requires predictable low-delay handling when competing data traffic fills a constrained link. The stated collaboration requirement instead depends on class maps select packets for subsequent policy-map treatment using defined match criteria.

Question 394

A Cisco collaboration operations team is closing a ticket for this requirement: A WAN router needs to identify RTP audio packets already marked with DSCP EF. Which result provides the strongest verification?

  1. Interface policy statistics increase for voice and observed queuing follows the configured classes.
  2. Policy counters increment for test audio packets and not for unrelated data.
  3. Congestion testing protects real-time calls and preserves a minimum viable service for other classes.
  4. An echo test shows the reflected signal is acceptably attenuated on the affected leg.

Explanation

Correct Answer

B:

Class maps select packets for subsequent policy-map treatment using defined match criteria. This is decisive because the expected outcome is: Policy counters increment for test audio packets and not for unrelated data.

Incorrect Answers

A:

“Interface policy statistics increase for voice and observed queuing follows the configured classes” evaluates a defined policy-map has no forwarding effect until attached to a supported interface/direction. It would not confirm the collaboration outcome requiring class maps select packets for subsequent policy-map treatment using defined match criteria.

C:

“Congestion testing protects real-time calls and preserves a minimum viable service for other classes” evaluates low-latency queuing needs capacity control as well as preferential service. It would not confirm the collaboration outcome requiring class maps select packets for subsequent policy-map treatment using defined match criteria.

D:

“An echo test shows the reflected signal is acceptably attenuated on the affected leg” evaluates echo relates to delayed audio reflection or leakage rather than SIP registration. It would not confirm the collaboration outcome requiring class maps select packets for subsequent policy-map treatment using defined match criteria.

Question 395

During a collaboration systems review, the following is documented: A class map correctly identifies voice packets but the policy never gives them low-delay queue treatment. Which response should engineers prioritize?

  1. Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination.
  2. Add an appropriate priority class with a bounded allocation in the IOS XE policy-map.
  3. Attach the intended service-policy in the correct direction on the actual congested egress interface.
  4. Align WLAN multimedia access categories and supported QoS markings with the wired end-to-end policy.

Explanation

Correct Answer

B:

LLQ scheduling follows the queue configuration in the policy-map, not classification alone. Apply the specific remedy: Add an appropriate priority class with a bounded allocation in the IOS XE policy-map. Verify it by checking: Under congestion the strict-priority class sees bounded latency without starving data.

Incorrect Answers

A:

“Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination” concerns low-latency queuing needs capacity control as well as preferential service. The stated collaboration requirement instead depends on lLQ scheduling follows the queue configuration in the policy-map, not classification alone.

C:

“Attach the intended service-policy in the correct direction on the actual congested egress interface” concerns a defined policy-map has no forwarding effect until attached to a supported interface/direction. The stated collaboration requirement instead depends on lLQ scheduling follows the queue configuration in the policy-map, not classification alone.

D:

“Align WLAN multimedia access categories and supported QoS markings with the wired end-to-end policy” concerns wireless WMM queues and wired DSCP treatment must map coherently across the access boundary. The stated collaboration requirement instead depends on lLQ scheduling follows the queue configuration in the policy-map, not classification alone.

Question 396

An assessor is validating a change intended to fix: A class map correctly identifies voice packets but the policy never gives them low-delay queue treatment. Which observed result is most decisive?

  1. Congestion testing protects real-time calls and preserves a minimum viable service for other classes.
  2. Interface policy statistics increase for voice and observed queuing follows the configured classes.
  3. Under congestion the strict-priority class sees bounded latency without starving data.
  4. Packets leaving the switch retain the approved media marking while untrusted data does not.

Explanation

Correct Answer

C:

LLQ scheduling follows the queue configuration in the policy-map, not classification alone. This is decisive because the expected outcome is: Under congestion the strict-priority class sees bounded latency without starving data.

Incorrect Answers

A:

“Congestion testing protects real-time calls and preserves a minimum viable service for other classes” evaluates low-latency queuing needs capacity control as well as preferential service. It would not confirm the collaboration outcome requiring lLQ scheduling follows the queue configuration in the policy-map, not classification alone.

B:

“Interface policy statistics increase for voice and observed queuing follows the configured classes” evaluates a defined policy-map has no forwarding effect until attached to a supported interface/direction. It would not confirm the collaboration outcome requiring lLQ scheduling follows the queue configuration in the policy-map, not classification alone.

D:

“Packets leaving the switch retain the approved media marking while untrusted data does not” evaluates the access layer is responsible for preserving and controlling QoS marking legitimacy. It would not confirm the collaboration outcome requiring lLQ scheduling follows the queue configuration in the policy-map, not classification alone.

Question 397

During a migration-readiness audit, the assessor records: An LLQ policy-map exists in router configuration but no packet counters change during calls. Which implementation meets the constraint?

  1. Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination.
  2. Create an IOS XE class-map matching the approved EF media traffic.
  3. Measure RTP loss, jitter and delay under congestion and repair the bottleneck or QoS treatment.
  4. Attach the intended service-policy in the correct direction on the actual congested egress interface.

Explanation

Correct Answer

D:

A defined policy-map has no forwarding effect until attached to a supported interface/direction. Apply the specific remedy: Attach the intended service-policy in the correct direction on the actual congested egress interface. Verify it by checking: Interface policy statistics increase for voice and observed queuing follows the configured classes.

Incorrect Answers

A:

“Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination” concerns low-latency queuing needs capacity control as well as preferential service. The stated collaboration requirement instead depends on a defined policy-map has no forwarding effect until attached to a supported interface/direction.

B:

“Create an IOS XE class-map matching the approved EF media traffic” concerns class maps select packets for subsequent policy-map treatment using defined match criteria. The stated collaboration requirement instead depends on a defined policy-map has no forwarding effect until attached to a supported interface/direction.

C:

“Measure RTP loss, jitter and delay under congestion and repair the bottleneck or QoS treatment” concerns real-time audio is vulnerable to delay variation and packet loss even while a call remains connected. The stated collaboration requirement instead depends on a defined policy-map has no forwarding effect until attached to a supported interface/direction.

Question 398

An assessor is validating a change intended to fix: An LLQ policy-map exists in router configuration but no packet counters change during calls. Which observed result is most decisive?

  1. Interface policy statistics increase for voice and observed queuing follows the configured classes.
  2. Congestion testing protects real-time calls and preserves a minimum viable service for other classes.
  3. Policy counters increment for test audio packets and not for unrelated data.
  4. Saturation tests keep voice latency and loss bounded while backup traffic slows.

Explanation

Correct Answer

A:

A defined policy-map has no forwarding effect until attached to a supported interface/direction. This is decisive because the expected outcome is: Interface policy statistics increase for voice and observed queuing follows the configured classes.

Incorrect Answers

B:

“Congestion testing protects real-time calls and preserves a minimum viable service for other classes” evaluates low-latency queuing needs capacity control as well as preferential service. It would not confirm the collaboration outcome requiring a defined policy-map has no forwarding effect until attached to a supported interface/direction.

C:

“Policy counters increment for test audio packets and not for unrelated data” evaluates class maps select packets for subsequent policy-map treatment using defined match criteria. It would not confirm the collaboration outcome requiring a defined policy-map has no forwarding effect until attached to a supported interface/direction.

D:

“Saturation tests keep voice latency and loss bounded while backup traffic slows” evaluates real-time audio requires predictable low-delay handling when competing data traffic fills a constrained link. It would not confirm the collaboration outcome requiring a defined policy-map has no forwarding effect until attached to a supported interface/direction.

Question 399

During a migration-readiness audit, the assessor records: Voice monopolizes a small WAN link because the priority class was configured without a defensible traffic budget. Which implementation meets the constraint?

  1. Attach the intended service-policy in the correct direction on the actual congested egress interface.
  2. Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination.
  3. Create an IOS XE class-map matching the approved EF media traffic.
  4. Trace RTP in both directions and inspect NAT, ACL and return-route behavior on the failing media path.

Explanation

Correct Answer

B:

Low-latency queuing needs capacity control as well as preferential service. Apply the specific remedy: Size LLQ priority bandwidth to measured admitted voice traffic and prevent unbounded queue domination. Verify it by checking: Congestion testing protects real-time calls and preserves a minimum viable service for other classes.

Incorrect Answers

A:

“Attach the intended service-policy in the correct direction on the actual congested egress interface” concerns a defined policy-map has no forwarding effect until attached to a supported interface/direction. The stated collaboration requirement instead depends on low-latency queuing needs capacity control as well as preferential service.

C:

“Create an IOS XE class-map matching the approved EF media traffic” concerns class maps select packets for subsequent policy-map treatment using defined match criteria. The stated collaboration requirement instead depends on low-latency queuing needs capacity control as well as preferential service.

D:

“Trace RTP in both directions and inspect NAT, ACL and return-route behavior on the failing media path” concerns one-way audio often means one RTP direction is blocked or misaddressed despite healthy SIP signaling. The stated collaboration requirement instead depends on low-latency queuing needs capacity control as well as preferential service.

Question 400

An assessor is validating a change intended to fix: Voice monopolizes a small WAN link because the priority class was configured without a defensible traffic budget. Which observed result is most decisive?

  1. Interface policy statistics increase for voice and observed queuing follows the configured classes.
  2. Policy counters increment for test audio packets and not for unrelated data.
  3. Congestion testing protects real-time calls and preserves a minimum viable service for other classes.
  4. Under load the meeting has bounded video loss and voice priority remains protected.

Explanation

Correct Answer

C:

Low-latency queuing needs capacity control as well as preferential service. This is decisive because the expected outcome is: Congestion testing protects real-time calls and preserves a minimum viable service for other classes.

Incorrect Answers

A:

“Interface policy statistics increase for voice and observed queuing follows the configured classes” evaluates a defined policy-map has no forwarding effect until attached to a supported interface/direction. It would not confirm the collaboration outcome requiring low-latency queuing needs capacity control as well as preferential service.

B:

“Policy counters increment for test audio packets and not for unrelated data” evaluates class maps select packets for subsequent policy-map treatment using defined match criteria. It would not confirm the collaboration outcome requiring low-latency queuing needs capacity control as well as preferential service.

D:

“Under load the meeting has bounded video loss and voice priority remains protected” evaluates video generally needs managed bandwidth without starving other traffic through unrestricted priority treatment. It would not confirm the collaboration outcome requiring low-latency queuing needs capacity control as well as preferential service.

Implementing Cisco Collaboration Core Technologies (CLCOR) (350-801) Practice Tests

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