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Cisco 350-501 Practice Test 81

Question 800

After Starlight IP Services deploys L3VPN label blackhole diagnosis to investigate a VPNv4 route that exists in BGP but does not carry packets end to end, the primary acceptance check passes (the programmed FIB includes valid next hop and VPN egress label disposition). What remaining operational risk should still be part of the design review?

  1. Incorrect route targets can leak sensitive routes across tenants.
  2. Carrier-of-carrier design introduces inter-provider trust and scale constraints.
  3. RP redundancy and RPF consistency influence multicast availability.
  4. Packet loss can reflect core MTU or data-plane policy even with labels installed.

Explanation

Correct Answer

D:

The relevant boundary of L3VPN label blackhole diagnosis is that packet loss can reflect core MTU or data-plane policy even with labels installed. Passing the acceptance test does not eliminate this residual operational risk.

Incorrect Answers

A:

This concern applies to route target VPN membership in a different scenario where operators need to control which provider-edge VRFs import a shared customer's VPN routes. For the deployed L3VPN label blackhole diagnosis approach, the relevant caution is instead that packet loss can reflect core MTU or data-plane policy even with labels installed.

B:

This concern applies to carrier supporting carrier VPN in a different scenario where operators need to let a carrier customer transport its own labeled VPN services over another carrier backbone. For the deployed L3VPN label blackhole diagnosis approach, the relevant caution is instead that packet loss can reflect core MTU or data-plane policy even with labels installed.

C:

This concern applies to PIM-SM shared tree initial join in a different scenario where operators need to provide multicast to sparse receivers through an RP-assisted distribution process. For the deployed L3VPN label blackhole diagnosis approach, the relevant caution is instead that packet loss can reflect core MTU or data-plane policy even with labels installed.

Question 801

Northstar Carrier must provide multicast to sparse receivers through an RP-assisted distribution process. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?

  1. PIM-SM shared tree initial join
  2. IGMPv3 inclusion filtering
  3. shared extranet route import
  4. EVPN MAC mobility control

Explanation

Correct Answer

A:

PIM-SM shared tree initial join matches this requirement: the team should configure PIM sparse mode and consistent rendezvous point reachability. A relevant outcome would be that receivers join the shared tree and traffic begins arriving through RP-based state.

Incorrect Answers

B:

IGMPv3 inclusion filtering instead addresses a different condition: request multicast only from one specified source at the IPv4 receiver edge. It would instead require you to send appropriate IGMPv3 INCLUDE-mode membership state, not the stated goal to provide multicast to sparse receivers through an RP-assisted distribution process.

C:

shared extranet route import instead addresses a different condition: let only selected tenants reach a common internal service subnet. It would instead require you to create explicit selective route-target import or route-leak policies for the shared service, not the stated goal to provide multicast to sparse receivers through an RP-assisted distribution process.

D:

EVPN MAC mobility control instead addresses a different condition: maintain forwarding when a customer virtual machine moves between EVPN access PEs. It would instead require you to apply MAC mobility and sequence handling for newly advertised locations, not the stated goal to provide multicast to sparse receivers through an RP-assisted distribution process.

Question 802

At Orion Transit, the engineering change is approved for PIM-SM shared tree initial join. The specific goal is to provide multicast to sparse receivers through an RP-assisted distribution process. Which implementation step belongs in this change plan?

  1. Send appropriate IGMPv3 INCLUDE-mode membership state.
  2. Configure PIM sparse mode and consistent rendezvous point reachability.
  3. Create explicit selective route-target import or route-leak policies for the shared service.
  4. Apply MAC mobility and sequence handling for newly advertised locations.

Explanation

Correct Answer

B:

Implementing PIM-SM shared tree initial join requires the operator to configure PIM sparse mode and consistent rendezvous point reachability. This makes the required goal testable using evidence that receivers join the shared tree and traffic begins arriving through RP-based state.

Incorrect Answers

A:

The proposed step is for IGMPv3 inclusion filtering, whose purpose is to request multicast only from one specified source at the IPv4 receiver edge. It would not perform the necessary PIM-SM shared tree initial join operation: configure PIM sparse mode and consistent rendezvous point reachability.

C:

The proposed step is for shared extranet route import, whose purpose is to let only selected tenants reach a common internal service subnet. It would not perform the necessary PIM-SM shared tree initial join operation: configure PIM sparse mode and consistent rendezvous point reachability.

D:

The proposed step is for EVPN MAC mobility control, whose purpose is to maintain forwarding when a customer virtual machine moves between EVPN access PEs. It would not perform the necessary PIM-SM shared tree initial join operation: configure PIM sparse mode and consistent rendezvous point reachability.

Question 803

Meridian Networks has deployed PIM-SM shared tree initial join to provide multicast to sparse receivers through an RP-assisted distribution process. The implementation step was to configure PIM sparse mode and consistent rendezvous point reachability. Which observation demonstrates that the requested service is working?

  1. The last-hop router forwards only the approved source/group traffic.
  2. Authorized VRFs reach the shared prefix while unrelated VRFs remain isolated.
  3. Receivers join the shared tree and traffic begins arriving through RP-based state.
  4. Remote sites converge on the latest legitimate MAC attachment point.

Explanation

Correct Answer

C:

For PIM-SM shared tree initial join, successful verification means that receivers join the shared tree and traffic begins arriving through RP-based state. That evidence directly tests whether the provider can provide multicast to sparse receivers through an RP-assisted distribution process after deployment.

Incorrect Answers

A:

The observation would verify IGMPv3 inclusion filtering under the separate requirement to request multicast only from one specified source at the IPv4 receiver edge. It does not demonstrate the needed PIM-SM shared tree initial join result: receivers join the shared tree and traffic begins arriving through RP-based state.

B:

The observation would verify shared extranet route import under the separate requirement to let only selected tenants reach a common internal service subnet. It does not demonstrate the needed PIM-SM shared tree initial join result: receivers join the shared tree and traffic begins arriving through RP-based state.

D:

The observation would verify EVPN MAC mobility control under the separate requirement to maintain forwarding when a customer virtual machine moves between EVPN access PEs. It does not demonstrate the needed PIM-SM shared tree initial join result: receivers join the shared tree and traffic begins arriving through RP-based state.

Question 804

While troubleshooting PIM-SM shared tree initial join at Kestrel Broadband, the intended acceptance outcome is still missing: receivers join the shared tree and traffic begins arriving through RP-based state. Which fault condition should be investigated first for this particular design?

  1. IGMPv2 group-only membership is treated as if it encoded a source filter.
  2. All customer routes are mutually imported to enable one shared application.
  3. Older advertisements repeatedly overwrite the new location and cause oscillation.
  4. No RP is reachable but group joins are expected to create a shared tree.

Explanation

Correct Answer

D:

The suspected defect directly frustrates PIM-SM shared tree initial join: no RP is reachable but group joins are expected to create a shared tree. Correcting it should allow verification that receivers join the shared tree and traffic begins arriving through RP-based state.

Incorrect Answers

A:

This defect belongs to IGMPv3 inclusion filtering, where the affected outcome is to request multicast only from one specified source at the IPv4 receiver edge. It is not the direct failure mode identified for the PIM-SM shared tree initial join design in this case: no RP is reachable but group joins are expected to create a shared tree.

B:

This defect belongs to shared extranet route import, where the affected outcome is to let only selected tenants reach a common internal service subnet. It is not the direct failure mode identified for the PIM-SM shared tree initial join design in this case: no RP is reachable but group joins are expected to create a shared tree.

C:

This defect belongs to EVPN MAC mobility control, where the affected outcome is to maintain forwarding when a customer virtual machine moves between EVPN access PEs. It is not the direct failure mode identified for the PIM-SM shared tree initial join design in this case: no RP is reachable but group joins are expected to create a shared tree.

Question 805

After Harbor Metro deploys PIM-SM shared tree initial join to provide multicast to sparse receivers through an RP-assisted distribution process, the primary acceptance check passes (receivers join the shared tree and traffic begins arriving through RP-based state). What remaining operational risk should still be part of the design review?

  1. RP redundancy and RPF consistency influence multicast availability.
  2. Application and switch support for IGMPv3 is required.
  3. Overly broad import policies break isolation and complicate return routing.
  4. Rapidly flapping customer MACs can still trigger mobility dampening.

Explanation

Correct Answer

A:

The relevant boundary of PIM-SM shared tree initial join is that RP redundancy and RPF consistency influence multicast availability. Passing the acceptance test does not eliminate this residual operational risk.

Incorrect Answers

B:

This concern applies to IGMPv3 inclusion filtering in a different scenario where operators need to request multicast only from one specified source at the IPv4 receiver edge. For the deployed PIM-SM shared tree initial join approach, the relevant caution is instead that RP redundancy and RPF consistency influence multicast availability.

C:

This concern applies to shared extranet route import in a different scenario where operators need to let only selected tenants reach a common internal service subnet. For the deployed PIM-SM shared tree initial join approach, the relevant caution is instead that RP redundancy and RPF consistency influence multicast availability.

D:

This concern applies to EVPN MAC mobility control in a different scenario where operators need to maintain forwarding when a customer virtual machine moves between EVPN access PEs. For the deployed PIM-SM shared tree initial join approach, the relevant caution is instead that RP redundancy and RPF consistency influence multicast availability.

Question 806

Summit Service Provider must let subscribers request an explicitly selected multicast source and group pair. The operator is comparing several service-provider methods. Which design or control directly addresses that stated requirement?

  1. IGMPv3 inclusion filtering
  2. PIM-SSM source-specific join
  3. EVPN multihomed all-active Ethernet segment
  4. controlled Internet breakout

Explanation

Correct Answer

B:

PIM-SSM source-specific join matches this requirement: the team should use SSM with source-aware membership such as IGMPv3 on supported receivers. A relevant outcome would be that the forwarding entry matches the requested source and group without RP discovery.

Incorrect Answers

A:

IGMPv3 inclusion filtering instead addresses a different condition: request multicast only from one specified source at the IPv4 receiver edge. It would instead require you to send appropriate IGMPv3 INCLUDE-mode membership state, not the stated goal to let subscribers request an explicitly selected multicast source and group pair.

C:

EVPN multihomed all-active Ethernet segment instead addresses a different condition: let a CE use two provider edges without losing its active Ethernet path on one PE failure. It would instead require you to configure compatible EVPN Ethernet segment identifiers and all-active multihoming, not the stated goal to let subscribers request an explicitly selected multicast source and group pair.

D:

controlled Internet breakout instead addresses a different condition: provide Internet access for an L3VPN tenant without leaking private customer prefixes. It would instead require you to place an explicit default-route or shared-services handoff inside the authorized VPN routing design, not the stated goal to let subscribers request an explicitly selected multicast source and group pair.

Question 807

At Ridgeway Networks, the engineering change is approved for PIM-SSM source-specific join. The specific goal is to let subscribers request an explicitly selected multicast source and group pair. Which implementation step belongs in this change plan?

  1. Send appropriate IGMPv3 INCLUDE-mode membership state.
  2. Configure compatible EVPN Ethernet segment identifiers and all-active multihoming.
  3. Use SSM with source-aware membership such as IGMPv3 on supported receivers.
  4. Place an explicit default-route or shared-services handoff inside the authorized VPN routing design.

Explanation

Correct Answer

C:

Implementing PIM-SSM source-specific join requires the operator to use SSM with source-aware membership such as IGMPv3 on supported receivers. This makes the required goal testable using evidence that the forwarding entry matches the requested source and group without RP discovery.

Incorrect Answers

A:

The proposed step is for IGMPv3 inclusion filtering, whose purpose is to request multicast only from one specified source at the IPv4 receiver edge. It would not perform the necessary PIM-SSM source-specific join operation: use SSM with source-aware membership such as IGMPv3 on supported receivers.

B:

The proposed step is for EVPN multihomed all-active Ethernet segment, whose purpose is to let a CE use two provider edges without losing its active Ethernet path on one PE failure. It would not perform the necessary PIM-SSM source-specific join operation: use SSM with source-aware membership such as IGMPv3 on supported receivers.

D:

The proposed step is for controlled Internet breakout, whose purpose is to provide Internet access for an L3VPN tenant without leaking private customer prefixes. It would not perform the necessary PIM-SSM source-specific join operation: use SSM with source-aware membership such as IGMPv3 on supported receivers.

Question 808

Lakeside Transport has deployed PIM-SSM source-specific join to let subscribers request an explicitly selected multicast source and group pair. The implementation step was to use SSM with source-aware membership such as IGMPv3 on supported receivers. Which observation demonstrates that the requested service is working?

  1. The last-hop router forwards only the approved source/group traffic.
  2. Both PEs advertise eligible Ethernet segment reachability and failover retains service.
  3. Tenant traffic reaches a controlled egress while internal VPN routes remain isolated.
  4. The forwarding entry matches the requested source and group without RP discovery.

Explanation

Correct Answer

D:

For PIM-SSM source-specific join, successful verification means that the forwarding entry matches the requested source and group without RP discovery. That evidence directly tests whether the provider can let subscribers request an explicitly selected multicast source and group pair after deployment.

Incorrect Answers

A:

The observation would verify IGMPv3 inclusion filtering under the separate requirement to request multicast only from one specified source at the IPv4 receiver edge. It does not demonstrate the needed PIM-SSM source-specific join result: the forwarding entry matches the requested source and group without RP discovery.

B:

The observation would verify EVPN multihomed all-active Ethernet segment under the separate requirement to let a CE use two provider edges without losing its active Ethernet path on one PE failure. It does not demonstrate the needed PIM-SSM source-specific join result: the forwarding entry matches the requested source and group without RP discovery.

C:

The observation would verify controlled Internet breakout under the separate requirement to provide Internet access for an L3VPN tenant without leaking private customer prefixes. It does not demonstrate the needed PIM-SSM source-specific join result: the forwarding entry matches the requested source and group without RP discovery.

Question 809

While troubleshooting PIM-SSM source-specific join at Coastal Communications, the intended acceptance outcome is still missing: the forwarding entry matches the requested source and group without RP discovery. Which fault condition should be investigated first for this particular design?

  1. An any-source IGMPv2 membership is used expecting source-specific filtering.
  2. IGMPv2 group-only membership is treated as if it encoded a source filter.
  3. Two PEs use conflicting Ethernet segment IDs for the same customer handoff.
  4. A global default route is assumed automatically present in every VRF.

Explanation

Correct Answer

A:

The suspected defect directly frustrates PIM-SSM source-specific join: an any-source IGMPv2 membership is used expecting source-specific filtering. Correcting it should allow verification that the forwarding entry matches the requested source and group without RP discovery.

Incorrect Answers

B:

This defect belongs to IGMPv3 inclusion filtering, where the affected outcome is to request multicast only from one specified source at the IPv4 receiver edge. It is not the direct failure mode identified for the PIM-SSM source-specific join design in this case: an any-source IGMPv2 membership is used expecting source-specific filtering.

C:

This defect belongs to EVPN multihomed all-active Ethernet segment, where the affected outcome is to let a CE use two provider edges without losing its active Ethernet path on one PE failure. It is not the direct failure mode identified for the PIM-SSM source-specific join design in this case: an any-source IGMPv2 membership is used expecting source-specific filtering.

D:

This defect belongs to controlled Internet breakout, where the affected outcome is to provide Internet access for an L3VPN tenant without leaking private customer prefixes. It is not the direct failure mode identified for the PIM-SSM source-specific join design in this case: an any-source IGMPv2 membership is used expecting source-specific filtering.

Question 810

After Bluebird Infrastructure deploys PIM-SSM source-specific join to let subscribers request an explicitly selected multicast source and group pair, the primary acceptance check passes (the forwarding entry matches the requested source and group without RP discovery). What remaining operational risk should still be part of the design review?

  1. Application and switch support for IGMPv3 is required.
  2. The receiver must know and signal the intended multicast source.
  3. Split-horizon and aliasing behavior must be correct to avoid duplicate forwarding.
  4. Stateful firewall and return-path policies must match the breakout design.

Explanation

Correct Answer

B:

The relevant boundary of PIM-SSM source-specific join is that the receiver must know and signal the intended multicast source. Passing the acceptance test does not eliminate this residual operational risk.

Incorrect Answers

A:

This concern applies to IGMPv3 inclusion filtering in a different scenario where operators need to request multicast only from one specified source at the IPv4 receiver edge. For the deployed PIM-SSM source-specific join approach, the relevant caution is instead that the receiver must know and signal the intended multicast source.

C:

This concern applies to EVPN multihomed all-active Ethernet segment in a different scenario where operators need to let a CE use two provider edges without losing its active Ethernet path on one PE failure. For the deployed PIM-SSM source-specific join approach, the relevant caution is instead that the receiver must know and signal the intended multicast source.

D:

This concern applies to controlled Internet breakout in a different scenario where operators need to provide Internet access for an L3VPN tenant without leaking private customer prefixes. For the deployed PIM-SSM source-specific join approach, the relevant caution is instead that the receiver must know and signal the intended multicast source.


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