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Exam Code: JN0-664

Exam Name: Service Provider Routing and Switching, Professional (JNCIP-SP)

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

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Juniper JN0-664 Practice Test 68

Question 670

A carrier introduces a shared services VRF for centralized DNS. Observed: Customer VRFs can reach shared DNS but also import other tenants' direct routes. What evidence would validate recovery from this precise failure mode?

  1. VPN best path favors the primary and moves to backup during failure.
  2. Only the shared DNS prefixes traverse service VRFs and tenants stay isolated.
  3. VPN forwarding recovers and unsafe routes withdraw when transport is unavailable.
  4. All full-mesh sites exchange permitted prefixes with the new CE.

Explanation

Correct Answer

B:

The intended result is Only the shared DNS prefixes traverse service VRFs and tenants stay isolated. It specifically verifies recovery from the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability, which produced the original symptom: Customer VRFs can reach shared DNS but also import other tenants' direct routes. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: The VPN import policy modifies best-path attributes inconsistently. The present case reports Customer VRFs can reach shared DNS but also import other tenants' direct routes. Its completion test is Only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

C:

That observation would verify a separate fault involving mp-bgp control-plane reachability is out of sync with mpls transport forwarding. Its symptom is VPN route remains active at PEs despite loss of the underlying labeled transport. For this case the actual issue is the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability, and the relevant success signal is Only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

D:

This result is useful in another case with evidence The new VRF learns only one existing site after provisioning. It does not test recovery from customer vrfs can reach shared dns but also import other tenants' direct routes. Check instead whether only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

Question 671

A carrier introduces a shared services VRF for centralized DNS. Observed: Customer VRFs can reach shared DNS but also import other tenants' direct routes. What underlying protocol or service configuration problem best explains the evidence?

  1. The new site imports an incomplete set of route targets for the VPN.
  2. MP-BGP control-plane reachability is out of sync with MPLS transport forwarding.
  3. The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability.
  4. The VPN import policy modifies best-path attributes inconsistently.

Explanation

Correct Answer

C:

Because customer VRFs can reach shared DNS but also import other tenants' direct routes, the likely cause is the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability. It is testable: Scope RT and prefix exchange through the shared-services VRF to the DNS service only. Expected follow-up: Only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

Incorrect Answers

A:

That explanation fits another condition: The new VRF learns only one existing site after provisioning. The evidence here is Customer VRFs can reach shared DNS but also import other tenants' direct routes. Its closer root cause is The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability.

B:

The stated cause is possible elsewhere but explains vpn route remains active at pes despite loss of the underlying labeled transport, not customer vrfs can reach shared dns but also import other tenants' direct routes. This incident is better attributed to the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability.

D:

The VPN import policy modifies best-path attributes inconsistently. would normally be accompanied by a remote pe selects the backup site because the route policy overwrote local preference. The observed symptom is different: Customer VRFs can reach shared DNS but also import other tenants' direct routes. The likely cause is The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability.

Question 672

A carrier introduces a shared services VRF for centralized DNS. Observed: Customer VRFs can reach shared DNS but also import other tenants' direct routes. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that vPN best path favors the primary and moves to backup during failure. Flag recurrence if a remote PE selects the backup site because the route policy overwrote local preference.
  2. For each approved related change, verify that all full-mesh sites exchange permitted prefixes with the new CE. Flag recurrence if the new VRF learns only one existing site after provisioning.
  3. For each approved related change, verify that only the shared DNS prefixes traverse service VRFs and tenants stay isolated. Flag recurrence if customer VRFs can reach shared DNS but also import other tenants' direct routes.
  4. For each approved related change, verify that vPN forwarding recovers and unsafe routes withdraw when transport is unavailable. Flag recurrence if vPN route remains active at PEs despite loss of the underlying labeled transport.

Explanation

Correct Answer

C:

A useful regression gate tests whether only the shared DNS prefixes traverse service VRFs and tenants stay isolated and alerts when customer VRFs can reach shared DNS but also import other tenants' direct routes. This directly checks the technical weakness: The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

This gate monitors a different failure, a remote pe selects the backup site because the route policy overwrote local preference. It would not detect the current problem: Customer VRFs can reach shared DNS but also import other tenants' direct routes. The appropriate check requires only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

B:

It is valid for another service scenario but checks the new vrf learns only one existing site after provisioning. This case instead needs a gate for customer vrfs can reach shared dns but also import other tenants' direct routes and evidence that only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

D:

The proposed control is tied to mp-bgp control-plane reachability is out of sync with mpls transport forwarding, typically observed when vPN route remains active at PEs despite loss of the underlying labeled transport. Here the target is the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability; monitor only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

Question 673

An enterprise L3VPN has intermittent traffic during provider core maintenance. Observed: VPN route remains active at PEs despite loss of the underlying labeled transport. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Restore transport label distribution and add appropriate next-hop tracking.
  2. Temporarily accept both RTs during a controlled migration then remove the old one.
  3. Restrict tenant route import and define a deliberate inspection next hop.
  4. Align the OSPF domain and supported VPN OSPF route handling settings.

Explanation

Correct Answer

A:

The observed condition is VPN route remains active at PEs despite loss of the underlying labeled transport. That indicates mp-bgp control-plane reachability is out of sync with mpls transport forwarding. Applying the proposed remedy directly changes that condition. A concrete completion check is: VPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

Incorrect Answers

B:

The option may be useful when existing remote PEs stop importing routes before the new target is installed, but that is not the current evidence. Here, vPN route remains active at PEs despite loss of the underlying labeled transport, indicating mp-bgp control-plane reachability is out of sync with mpls transport forwarding. The targeted action is Restore transport label distribution and add appropriate next-hop tracking.

C:

This remediates rt policy permits an alternate direct path that avoids the approved service chain, normally indicated by One tenant bypasses inspection due to a direct imported route. It would leave the observed problem (VPN route remains active at PEs despite loss of the underlying labeled transport) unresolved. Address it with restore transport label distribution and add appropriate next-hop tracking.

D:

This change belongs to a different Layer 3 VPNs issue: Routes appear as interarea paths at a remote CE rather than expected intra-area continuation. That issue involves mp-bgp ospf domain or extended-community treatment differs across provider edges. The current symptom is VPN route remains active at PEs despite loss of the underlying labeled transport. It instead requires restore transport label distribution and add appropriate next-hop tracking.

Question 674

An enterprise L3VPN has intermittent traffic during provider core maintenance. Observed: VPN route remains active at PEs despite loss of the underlying labeled transport. After the correction, which result would most convincingly show that this fault is resolved?

  1. Allowed tenant traffic traverses the inspection service with symmetric return paths.
  2. Remote CE sees the intended route type and stable preference.
  3. VPN forwarding recovers and unsafe routes withdraw when transport is unavailable.
  4. Every site remains reachable through migration and converges on the new RT.

Explanation

Correct Answer

C:

After restore transport label distribution and add appropriate next-hop tracking, inspect whether vPN forwarding recovers and unsafe routes withdraw when transport is unavailable. This closes the loop between the reported observation (VPN route remains active at PEs despite loss of the underlying labeled transport) and the underlying issue (MP-BGP control-plane reachability is out of sync with MPLS transport forwarding).

Incorrect Answers

A:

This result is useful in another case with evidence One tenant bypasses inspection due to a direct imported route. It does not test recovery from vpn route remains active at pes despite loss of the underlying labeled transport. Check instead whether vPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

B:

It confirms an unrelated service correction: MP-BGP OSPF domain or extended-community treatment differs across provider edges. The present case reports VPN route remains active at PEs despite loss of the underlying labeled transport. Its completion test is VPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

D:

That observation would verify a separate fault involving export and import route-target changes were not staged compatibly. Its symptom is Existing remote PEs stop importing routes before the new target is installed. For this case the actual issue is mp-bgp control-plane reachability is out of sync with mpls transport forwarding, and the relevant success signal is VPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

Question 675

An enterprise L3VPN has intermittent traffic during provider core maintenance. Observed: VPN route remains active at PEs despite loss of the underlying labeled transport. Which root cause is most consistent with this symptom?

  1. Export and import route-target changes were not staged compatibly.
  2. MP-BGP control-plane reachability is out of sync with MPLS transport forwarding.
  3. RT policy permits an alternate direct path that avoids the approved service chain.
  4. MP-BGP OSPF domain or extended-community treatment differs across provider edges.

Explanation

Correct Answer

B:

The reported evidence—VPN route remains active at PEs despite loss of the underlying labeled transport—supports mp-bgp control-plane reachability is out of sync with mpls transport forwarding. The appropriate intervention is to restore transport label distribution and add appropriate next-hop tracking, with confirmation from vPN forwarding recovers and unsafe routes withdraw when transport is unavailable. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains existing remote pes stop importing routes before the new target is installed, not vpn route remains active at pes despite loss of the underlying labeled transport. This incident is better attributed to mp-bgp control-plane reachability is out of sync with mpls transport forwarding.

C:

That explanation fits another condition: One tenant bypasses inspection due to a direct imported route. The evidence here is VPN route remains active at PEs despite loss of the underlying labeled transport. Its closer root cause is MP-BGP control-plane reachability is out of sync with MPLS transport forwarding.

D:

MP-BGP OSPF domain or extended-community treatment differs across provider edges. would normally be accompanied by routes appear as interarea paths at a remote ce rather than expected intra-area continuation. The observed symptom is different: VPN route remains active at PEs despite loss of the underlying labeled transport. The likely cause is MP-BGP control-plane reachability is out of sync with MPLS transport forwarding.

Question 676

An enterprise L3VPN has intermittent traffic during provider core maintenance. Observed: VPN route remains active at PEs despite loss of the underlying labeled transport. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that vPN forwarding recovers and unsafe routes withdraw when transport is unavailable. Flag recurrence if vPN route remains active at PEs despite loss of the underlying labeled transport.
  2. For each approved related change, verify that every site remains reachable through migration and converges on the new RT. Flag recurrence if existing remote PEs stop importing routes before the new target is installed.
  3. For each approved related change, verify that remote CE sees the intended route type and stable preference. Flag recurrence if routes appear as interarea paths at a remote CE rather than expected intra-area continuation.
  4. For each approved related change, verify that allowed tenant traffic traverses the inspection service with symmetric return paths. Flag recurrence if one tenant bypasses inspection due to a direct imported route.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result VPN forwarding recovers and unsafe routes withdraw when transport is unavailable. and treats VPN route remains active at PEs despite loss of the underlying labeled transport. as a failure signal. The causal concern is mp-bgp control-plane reachability is out of sync with mpls transport forwarding.

Incorrect Answers

B:

The proposed control is tied to export and import route-target changes were not staged compatibly, typically observed when existing remote PEs stop importing routes before the new target is installed. Here the target is mp-bgp control-plane reachability is out of sync with mpls transport forwarding; monitor vPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

C:

This gate monitors a different failure, routes appear as interarea paths at a remote ce rather than expected intra-area continuation. It would not detect the current problem: VPN route remains active at PEs despite loss of the underlying labeled transport. The appropriate check requires vPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

D:

It is valid for another service scenario but checks one tenant bypasses inspection due to a direct imported route. This case instead needs a gate for vpn route remains active at pes despite loss of the underlying labeled transport and evidence that vPN forwarding recovers and unsafe routes withdraw when transport is unavailable.

Question 677

A managed services provider requires access to VPN routes for a security inspection node. Observed: One tenant bypasses inspection due to a direct imported route. What should the routing engineer change first to address this particular symptom?

  1. Implement a supported OSPF sham link where the service design requires equal intra-area semantics.
  2. Restrict tenant route import and define a deliberate inspection next hop.
  3. Verify bidirectional CE-to-PE routing and VRF export on the new site.
  4. Remove unintended master-table import and implement a scoped VPN-only default.

Explanation

Correct Answer

B:

The decisive evidence is that One tenant bypasses inspection due to a direct imported route. This follows from rt policy permits an alternate direct path that avoids the approved service chain. The focused remedy is to restrict tenant route import and define a deliberate inspection next hop. Confirm improvement when allowed tenant traffic traverses the inspection service with symmetric return paths. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when sham-link connectivity is missing and a customer backdoor link becomes preferred, but that is not the current evidence. Here, one tenant bypasses inspection due to a direct imported route, indicating rt policy permits an alternate direct path that avoids the approved service chain. The targeted action is Restrict tenant route import and define a deliberate inspection next hop.

C:

This remediates return-route exchange from the new site into its local vrf is missing, normally indicated by The remote PE sees the updated VPNv4 prefix but CE traffic cannot return. It would leave the observed problem (One tenant bypasses inspection due to a direct imported route) unresolved. Address it with restrict tenant route import and define a deliberate inspection next hop.

D:

This change belongs to a different Layer 3 VPNs issue: Core transit traffic starts following a customer Internet gateway. That issue involves a route leak was configured in the wrong direction between master and tenant vrfs. The current symptom is One tenant bypasses inspection due to a direct imported route. It instead requires restrict tenant route import and define a deliberate inspection next hop.

Question 678

A managed services provider requires access to VPN routes for a security inspection node. Observed: One tenant bypasses inspection due to a direct imported route. Which acceptance observation best confirms that the proposed change worked?

  1. Core routing stays independent and tenant Internet access follows its authorized path.
  2. The customer selects the intended VPN path under controlled backdoor tests.
  3. Allowed tenant traffic traverses the inspection service with symmetric return paths.
  4. Traceroute and routing checks confirm two-way customer reachability.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was One tenant bypasses inspection due to a direct imported route. The correction addresses rt policy permits an alternate direct path that avoids the approved service chain; success requires allowed tenant traffic traverses the inspection service with symmetric return paths.

Incorrect Answers

A:

It confirms an unrelated service correction: A route leak was configured in the wrong direction between master and tenant VRFs. The present case reports One tenant bypasses inspection due to a direct imported route. Its completion test is Allowed tenant traffic traverses the inspection service with symmetric return paths.

B:

That observation would verify a separate fault involving the provider path appears less preferable to the direct intra-area backdoor path. Its symptom is Sham-link connectivity is missing and a customer backdoor link becomes preferred. For this case the actual issue is rt policy permits an alternate direct path that avoids the approved service chain, and the relevant success signal is Allowed tenant traffic traverses the inspection service with symmetric return paths.

D:

This result is useful in another case with evidence The remote PE sees the updated VPNv4 prefix but CE traffic cannot return. It does not test recovery from one tenant bypasses inspection due to a direct imported route. Check instead whether allowed tenant traffic traverses the inspection service with symmetric return paths.

Question 679

A managed services provider requires access to VPN routes for a security inspection node. Observed: One tenant bypasses inspection due to a direct imported route. What is the most likely source of the observed routing or service failure?

  1. The provider path appears less preferable to the direct intra-area backdoor path.
  2. Return-route exchange from the new site into its local VRF is missing.
  3. A route leak was configured in the wrong direction between master and tenant VRFs.
  4. RT policy permits an alternate direct path that avoids the approved service chain.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: One tenant bypasses inspection due to a direct imported route. The specified root issue is RT policy permits an alternate direct path that avoids the approved service chain. Repair it through restrict tenant route import and define a deliberate inspection next hop, then check allowed tenant traffic traverses the inspection service with symmetric return paths.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains sham-link connectivity is missing and a customer backdoor link becomes preferred, not one tenant bypasses inspection due to a direct imported route. This incident is better attributed to rt policy permits an alternate direct path that avoids the approved service chain.

B:

That explanation fits another condition: The remote PE sees the updated VPNv4 prefix but CE traffic cannot return. The evidence here is One tenant bypasses inspection due to a direct imported route. Its closer root cause is RT policy permits an alternate direct path that avoids the approved service chain.

C:

A route leak was configured in the wrong direction between master and tenant VRFs. would normally be accompanied by core transit traffic starts following a customer internet gateway. The observed symptom is different: One tenant bypasses inspection due to a direct imported route. The likely cause is RT policy permits an alternate direct path that avoids the approved service chain.

Question 680

A managed services provider requires access to VPN routes for a security inspection node. Observed: One tenant bypasses inspection due to a direct imported route. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the customer selects the intended VPN path under controlled backdoor tests. Flag recurrence if sham-link connectivity is missing and a customer backdoor link becomes preferred.
  2. For each approved related change, verify that core routing stays independent and tenant Internet access follows its authorized path. Flag recurrence if core transit traffic starts following a customer Internet gateway.
  3. For each approved related change, verify that traceroute and routing checks confirm two-way customer reachability. Flag recurrence if the remote PE sees the updated VPNv4 prefix but CE traffic cannot return.
  4. For each approved related change, verify that allowed tenant traffic traverses the inspection service with symmetric return paths. Flag recurrence if one tenant bypasses inspection due to a direct imported route.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (Allowed tenant traffic traverses the inspection service with symmetric return paths) and flags recurrence of the same failure (One tenant bypasses inspection due to a direct imported route). It targets the underlying issue, rt policy permits an alternate direct path that avoids the approved service chain, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to the provider path appears less preferable to the direct intra-area backdoor path, typically observed when sham-link connectivity is missing and a customer backdoor link becomes preferred. Here the target is rt policy permits an alternate direct path that avoids the approved service chain; monitor allowed tenant traffic traverses the inspection service with symmetric return paths.

B:

This gate monitors a different failure, core transit traffic starts following a customer internet gateway. It would not detect the current problem: One tenant bypasses inspection due to a direct imported route. The appropriate check requires allowed tenant traffic traverses the inspection service with symmetric return paths.

C:

It is valid for another service scenario but checks the remote pe sees the updated vpnv4 prefix but ce traffic cannot return. This case instead needs a gate for one tenant bypasses inspection due to a direct imported route and evidence that allowed tenant traffic traverses the inspection service with symmetric return paths.

Service Provider Routing and Switching, Professional (JNCIP-SP) (JN0-664) Practice Tests