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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 43

Question 420

During acceptance testing after set the intended VRRP router to a higher valid priority., which evidence is most relevant?

  1. The SVI is up and the virtual IP responds from the active router.
  2. `show vrrp brief` identifies the preferred Master during election.
  3. `show ip mroute` records the correct incoming interface and forwards data.
  4. Router displays a joined multicast group without IGMPv3 source filter.

Explanation

Correct Answer

B:

`show vrrp brief` identifies the preferred Master during election. This is the targeted operational evidence for the change. VRRP master selection prefers higher router priority, subject to protocol behavior. 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: Verify SVI/VLAN status and FHRP interface availability. A virtual gateway depends on an operational L3 SVI and VLAN path. 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 multicast RPF check and unicast route to the source. RPF accepts multicast on the upstream interface toward the source. 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: Use group-based (*,G) membership where v2 is supported. IGMPv2 reports group membership without source include lists. 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 421

An FHRP default gateway does not answer clients after an SVI failure. Which change should the network engineer prioritize?

  1. Verify SVI/VLAN status and FHRP interface availability.
  2. Configure hosts to use the stable HSRP virtual IP as their default gateway.
  3. Use source-specific multicast membership as supported by IGMPv3 and SSM.
  4. Configure a reachable Rendezvous Point or supported RP discovery.

Explanation

Correct Answer

A:

A virtual gateway depends on an operational L3 SVI and VLAN path. The most direct remediation is verify SVI/VLAN status and FHRP interface availability. A practical acceptance test is the SVI is up and the virtual IP responds from the active router. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: Clients see a gateway IP change when an HSRP active router fails. FHRP protects the virtual gateway, not either router's physical SVI IP. It does not specifically correct the issue here: an FHRP default gateway does not answer clients after an SVI failure.

C:

This choice addresses a different situation: A LAN host sends an IGMPv3 join for one source only. IGMPv3 can express source-filtered (S,G) receiver interest. It does not specifically correct the issue here: an FHRP default gateway does not answer clients after an SVI failure.

D:

This choice addresses a different situation: A PIM sparse-mode multicast tree cannot reach an RP for shared-tree startup. PIM-SM uses RP for shared-tree receiver/source rendezvous. It does not specifically correct the issue here: an FHRP default gateway does not answer clients after an SVI failure.

Question 422

An operator has applied the following change: verify SVI/VLAN status and FHRP interface availability. Which observation best confirms it works?

  1. Host default route remains the same while active HSRP member changes.
  2. IGMP group table shows an include-source membership for the requested S,G.
  3. `show ip pim rp mapping` resolves the group range to a reachable RP.
  4. The SVI is up and the virtual IP responds from the active router.

Explanation

Correct Answer

D:

The SVI is up and the virtual IP responds from the active router. This is the targeted operational evidence for the change. A virtual gateway depends on an operational L3 SVI and VLAN path. 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: Configure hosts to use the stable HSRP virtual IP as their default gateway. FHRP protects the virtual gateway, not either router's physical SVI IP. 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: Use source-specific multicast membership as supported by IGMPv3 and SSM. IGMPv3 can express source-filtered (S,G) receiver interest. 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: Configure a reachable Rendezvous Point or supported RP discovery. PIM-SM uses RP for shared-tree receiver/source rendezvous. 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 423

Clients see a gateway IP change when an HSRP active router fails. Which remediation best resolves the described symptom?

  1. Inspect the multicast RPF check and unicast route to the source.
  2. Use group-based (*,G) membership where v2 is supported.
  3. Configure hosts to use the stable HSRP virtual IP as their default gateway.
  4. Use PIM source-specific multicast in the approved SSM range.

Explanation

Correct Answer

C:

FHRP protects the virtual gateway, not either router's physical SVI IP. The most direct remediation is configure hosts to use the stable HSRP virtual IP as their default gateway. A practical acceptance test is host default route remains the same while active HSRP member changes. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A multicast router drops packets whose source-specific route points to a different ingress interface. RPF accepts multicast on the upstream interface toward the source. It does not specifically correct the issue here: clients see a gateway IP change when an HSRP active router fails.

B:

This choice addresses a different situation: A receiver uses IGMPv2 and cannot specify multicast sources. IGMPv2 reports group membership without source include lists. It does not specifically correct the issue here: clients see a gateway IP change when an HSRP active router fails.

D:

This choice addresses a different situation: Multicast receivers must join known single sources without an RP. SSM builds source-rooted trees without a shared Rendezvous Point. It does not specifically correct the issue here: clients see a gateway IP change when an HSRP active router fails.

Question 424

After implementing configure hosts to use the stable HSRP virtual IP as their default gateway., which operational evidence should an engineer collect?

  1. `show ip mroute` records the correct incoming interface and forwards data.
  2. Host default route remains the same while active HSRP member changes.
  3. Router displays a joined multicast group without IGMPv3 source filter.
  4. The multicast route table holds the intended (S,G) without RP dependence.

Explanation

Correct Answer

B:

Host default route remains the same while active HSRP member changes. This is the targeted operational evidence for the change. FHRP protects the virtual gateway, not either router's physical SVI IP. 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: Inspect the multicast RPF check and unicast route to the source. RPF accepts multicast on the upstream interface toward the source. 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 group-based (*,G) membership where v2 is supported. IGMPv2 reports group membership without source include lists. 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: Use PIM source-specific multicast in the approved SSM range. SSM builds source-rooted trees without a shared Rendezvous Point. 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 425

A multicast router drops packets whose source-specific route points to a different ingress interface. How should the team implement the required behavior?

  1. Inspect the multicast RPF check and unicast route to the source.
  2. Use source-specific multicast membership as supported by IGMPv3 and SSM.
  3. Configure a reachable Rendezvous Point or supported RP discovery.
  4. Evaluate MSDP for source-active information exchange where appropriate.

Explanation

Correct Answer

A:

RPF accepts multicast on the upstream interface toward the source. The most direct remediation is inspect the multicast RPF check and unicast route to the source. A practical acceptance test is `show ip mroute` records the correct incoming interface and forwards data. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A LAN host sends an IGMPv3 join for one source only. IGMPv3 can express source-filtered (S,G) receiver interest. It does not specifically correct the issue here: a multicast router drops packets whose source-specific route points to a different ingress interface.

C:

This choice addresses a different situation: A PIM sparse-mode multicast tree cannot reach an RP for shared-tree startup. PIM-SM uses RP for shared-tree receiver/source rendezvous. It does not specifically correct the issue here: a multicast router drops packets whose source-specific route points to a different ingress interface.

D:

This choice addresses a different situation: Multiple multicast domains use different rendezvous points and sources. MSDP can distribute source-active information between PIM-SM RP domains. It does not specifically correct the issue here: a multicast router drops packets whose source-specific route points to a different ingress interface.

Question 426

The change request says: inspect the multicast RPF check and unicast route to the source. Which verification result is most decisive?

  1. IGMP group table shows an include-source membership for the requested S,G.
  2. `show ip pim rp mapping` resolves the group range to a reachable RP.
  3. SA cache contains expected remote active-source announcements.
  4. `show ip mroute` records the correct incoming interface and forwards data.

Explanation

Correct Answer

D:

`show ip mroute` records the correct incoming interface and forwards data. This is the targeted operational evidence for the change. RPF accepts multicast on the upstream interface toward the source. 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: Use source-specific multicast membership as supported by IGMPv3 and SSM. IGMPv3 can express source-filtered (S,G) receiver interest. 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: Configure a reachable Rendezvous Point or supported RP discovery. PIM-SM uses RP for shared-tree receiver/source rendezvous. 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: Evaluate MSDP for source-active information exchange where appropriate. MSDP can distribute source-active information between PIM-SM RP domains. 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 427

A LAN host sends an IGMPv3 join for one source only. What is the most appropriate corrective measure?

  1. Use group-based (*,G) membership where v2 is supported.
  2. Use PIM source-specific multicast in the approved SSM range.
  3. Use source-specific multicast membership as supported by IGMPv3 and SSM.
  4. Verify IGMP snooping state and querier availability on the VLAN.

Explanation

Correct Answer

C:

IGMPv3 can express source-filtered (S,G) receiver interest. The most direct remediation is use source-specific multicast membership as supported by IGMPv3 and SSM. A practical acceptance test is iGMP group table shows an include-source membership for the requested S,G. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A receiver uses IGMPv2 and cannot specify multicast sources. IGMPv2 reports group membership without source include lists. It does not specifically correct the issue here: a LAN host sends an IGMPv3 join for one source only.

B:

This choice addresses a different situation: Multicast receivers must join known single sources without an RP. SSM builds source-rooted trees without a shared Rendezvous Point. It does not specifically correct the issue here: a LAN host sends an IGMPv3 join for one source only.

D:

This choice addresses a different situation: A multicast LAN has no receiver membership and downstream multicast still floods. Snooping can constrain multicast L2 replication to subscribed ports. It does not specifically correct the issue here: a LAN host sends an IGMPv3 join for one source only.

Question 428

A post-change test follows this action: use source-specific multicast membership as supported by IGMPv3 and SSM. Which result demonstrates success?

  1. Router displays a joined multicast group without IGMPv3 source filter.
  2. IGMP group table shows an include-source membership for the requested S,G.
  3. The multicast route table holds the intended (S,G) without RP dependence.
  4. IGMP snooping table lists only subscribed receiver ports for the group.

Explanation

Correct Answer

B:

IGMP group table shows an include-source membership for the requested S,G. This is the targeted operational evidence for the change. IGMPv3 can express source-filtered (S,G) receiver interest. 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: Use group-based (*,G) membership where v2 is supported. IGMPv2 reports group membership without source include lists. 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 PIM source-specific multicast in the approved SSM range. SSM builds source-rooted trees without a shared Rendezvous Point. 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: Verify IGMP snooping state and querier availability on the VLAN. Snooping can constrain multicast L2 replication to subscribed ports. 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 429

A receiver uses IGMPv2 and cannot specify multicast sources. Which action most directly addresses this situation?

  1. Use group-based (*,G) membership where v2 is supported.
  2. Configure a reachable Rendezvous Point or supported RP discovery.
  3. Evaluate MSDP for source-active information exchange where appropriate.
  4. Check last-hop router SPT switchover behavior and thresholds.

Explanation

Correct Answer

A:

IGMPv2 reports group membership without source include lists. The most direct remediation is use group-based (*,G) membership where v2 is supported. A practical acceptance test is router displays a joined multicast group without IGMPv3 source filter. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A PIM sparse-mode multicast tree cannot reach an RP for shared-tree startup. PIM-SM uses RP for shared-tree receiver/source rendezvous. It does not specifically correct the issue here: a receiver uses IGMPv2 and cannot specify multicast sources.

C:

This choice addresses a different situation: Multiple multicast domains use different rendezvous points and sources. MSDP can distribute source-active information between PIM-SM RP domains. It does not specifically correct the issue here: a receiver uses IGMPv2 and cannot specify multicast sources.

D:

This choice addresses a different situation: A PIM-SM multicast forwarding entry stays (*,G) even with a high-traffic source. PIM-SM may transition from RP-rooted shared tree to a source shortest-path tree. It does not specifically correct the issue here: a receiver uses IGMPv2 and cannot specify multicast sources.

Question 430

During acceptance testing after use group-based (*,G) membership where v2 is supported., which evidence is most relevant?

  1. `show ip pim rp mapping` resolves the group range to a reachable RP.
  2. SA cache contains expected remote active-source announcements.
  3. The multicast table adds an (S,G) entry with source-oriented incoming interface.
  4. Router displays a joined multicast group without IGMPv3 source filter.

Explanation

Correct Answer

D:

Router displays a joined multicast group without IGMPv3 source filter. This is the targeted operational evidence for the change. IGMPv2 reports group membership without source include lists. 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: Configure a reachable Rendezvous Point or supported RP discovery. PIM-SM uses RP for shared-tree receiver/source rendezvous. 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: Evaluate MSDP for source-active information exchange where appropriate. MSDP can distribute source-active information between PIM-SM RP domains. 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: Check last-hop router SPT switchover behavior and thresholds. PIM-SM may transition from RP-rooted shared tree to a source shortest-path tree. 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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