McAfee-Secured Website

Exam Code: JN0-664

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

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

100% Juniper JN0-664 Guaranteed Success With Testking Training Materials

Get Real JN0-664 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

96 Questions & Answers with Testing Engine

"Service Provider Routing and Switching, Professional (JNCIP-SP) Exam", also known as JN0-664 exam, is a Juniper certification exam.

Pass your tests with the always up-to-date JN0-664 Exam Engine. Your JN0-664 training materials keep you at the head of the pack!

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Was: $137.49
Now: $124.99

Juniper JN0-664 Practice Test 60

Question 590

An L3VPN reuses the same OSPF domain ID across overlapping services. Observed: Sham-link connectivity is missing and a customer backdoor link becomes preferred. After the correction, which result would most convincingly show that this fault is resolved?

  1. Eligible CE prefixes enter the correct VRF and appear in remote VPN sites.
  2. The customer selects the intended VPN path under controlled backdoor tests.
  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

B:

After implement a supported OSPF sham link where the service design requires equal intra-area semantics, inspect whether the customer selects the intended VPN path under controlled backdoor tests. This closes the loop between the reported observation (Sham-link connectivity is missing and a customer backdoor link becomes preferred) and the underlying issue (The provider path appears less preferable to the direct intra-area backdoor path).

Incorrect Answers

A:

This result is useful in another case with evidence The PE does not export the agreed customer prefixes into its VRF. It does not test recovery from sham-link connectivity is missing and a customer backdoor link becomes preferred. Check instead whether the customer selects the intended VPN path under controlled backdoor tests.

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 provider path appears less preferable to the direct intra-area backdoor path, and the relevant success signal is The customer selects the intended VPN path under controlled backdoor tests.

D:

It confirms an unrelated service correction: Export and import route-target changes were not staged compatibly. The present case reports Sham-link connectivity is missing and a customer backdoor link becomes preferred. Its completion test is The customer selects the intended VPN path under controlled backdoor tests.

Question 591

An L3VPN reuses the same OSPF domain ID across overlapping services. Observed: Sham-link connectivity is missing and a customer backdoor link becomes preferred. Which root cause is most consistent with this symptom?

  1. The CE-facing import policy is not accepting those routes.
  2. MP-BGP control-plane reachability is out of sync with MPLS transport forwarding.
  3. Export and import route-target changes were not staged compatibly.
  4. The provider path appears less preferable to the direct intra-area backdoor path.

Explanation

Correct Answer

D:

The reported evidence—Sham-link connectivity is missing and a customer backdoor link becomes preferred—supports the provider path appears less preferable to the direct intra-area backdoor path. The appropriate intervention is to implement a supported OSPF sham link where the service design requires equal intra-area semantics, with confirmation from the customer selects the intended VPN path under controlled backdoor tests. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: The PE does not export the agreed customer prefixes into its VRF. The evidence here is Sham-link connectivity is missing and a customer backdoor link becomes preferred. Its closer root cause is The provider path appears less preferable to the direct intra-area backdoor path.

B:

The stated cause is possible elsewhere but explains vpn route remains active at pes despite loss of the underlying labeled transport, not sham-link connectivity is missing and a customer backdoor link becomes preferred. This incident is better attributed to the provider path appears less preferable to the direct intra-area backdoor path.

C:

Export and import route-target changes were not staged compatibly. would normally be accompanied by existing remote pes stop importing routes before the new target is installed. The observed symptom is different: Sham-link connectivity is missing and a customer backdoor link becomes preferred. The likely cause is The provider path appears less preferable to the direct intra-area backdoor path.

Question 592

An L3VPN reuses the same OSPF domain ID across overlapping services. Observed: Sham-link connectivity is missing and a customer backdoor link becomes preferred. 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 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.
  3. For each approved related change, verify that eligible CE prefixes enter the correct VRF and appear in remote VPN sites. Flag recurrence if the PE does not export the agreed customer prefixes into its VRF.
  4. 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.

Explanation

Correct Answer

B:

The control is specific to the initial failure. It requires the result The customer selects the intended VPN path under controlled backdoor tests. and treats Sham-link connectivity is missing and a customer backdoor link becomes preferred. as a failure signal. The causal concern is the provider path appears less preferable to the direct intra-area backdoor path.

Incorrect Answers

A:

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 provider path appears less preferable to the direct intra-area backdoor path; monitor the customer selects the intended VPN path under controlled backdoor tests.

C:

It is valid for another service scenario but checks the pe does not export the agreed customer prefixes into its vrf. This case instead needs a gate for sham-link connectivity is missing and a customer backdoor link becomes preferred and evidence that the customer selects the intended VPN path under controlled backdoor tests.

D:

This gate monitors a different failure, existing remote pes stop importing routes before the new target is installed. It would not detect the current problem: Sham-link connectivity is missing and a customer backdoor link becomes preferred. The appropriate check requires the customer selects the intended VPN path under controlled backdoor tests.

Question 593

An L3VPN gateway CE and PE run BGP. Observed: The PE does not export the agreed customer prefixes into its VRF. What should the routing engineer change first to address this particular symptom?

  1. Adjust customer-specific CE-to-PE route admission and VRF propagation policy.
  2. Restrict tenant route import and define a deliberate inspection next hop.
  3. Correct VRF label association and inspect MPLS service-label forwarding state.
  4. Verify bidirectional CE-to-PE routing and VRF export on the new site.

Explanation

Correct Answer

A:

The decisive evidence is that The PE does not export the agreed customer prefixes into its VRF. This follows from the ce-facing import policy is not accepting those routes. The focused remedy is to adjust customer-specific CE-to-PE route admission and VRF propagation policy. Confirm improvement when eligible CE prefixes enter the correct VRF and appear in remote VPN sites. Validate on an approved lab or change window before touching production.

Incorrect Answers

B:

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 (The PE does not export the agreed customer prefixes into its VRF) unresolved. Address it with adjust customer-specific CE-to-PE route admission and VRF propagation policy.

C:

This change belongs to a different Layer 3 VPNs issue: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. That issue involves the service label maps to an unexpected forwarding table or vrf. The current symptom is The PE does not export the agreed customer prefixes into its VRF. It instead requires adjust customer-specific CE-to-PE route admission and VRF propagation policy.

D:

The option may be useful when the remote PE sees the updated VPNv4 prefix but CE traffic cannot return, but that is not the current evidence. Here, the PE does not export the agreed customer prefixes into its VRF, indicating the ce-facing import policy is not accepting those routes. The targeted action is Adjust customer-specific CE-to-PE route admission and VRF propagation policy.

Question 594

An L3VPN gateway CE and PE run BGP. Observed: The PE does not export the agreed customer prefixes into its VRF. Which acceptance observation best confirms that the proposed change worked?

  1. Allowed tenant traffic traverses the inspection service with symmetric return paths.
  2. Eligible CE prefixes enter the correct VRF and appear in remote VPN sites.
  3. Inbound labeled packets resolve into the intended customer's VRF.
  4. Traceroute and routing checks confirm two-way customer reachability.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was The PE does not export the agreed customer prefixes into its VRF. The correction addresses the ce-facing import policy is not accepting those routes; success requires eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

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 the pe does not export the agreed customer prefixes into its vrf. Check instead whether eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

C:

It confirms an unrelated service correction: The service label maps to an unexpected forwarding table or VRF. The present case reports The PE does not export the agreed customer prefixes into its VRF. Its completion test is Eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

D:

That observation would verify a separate fault involving return-route exchange from the new site into its local vrf is missing. Its symptom is The remote PE sees the updated VPNv4 prefix but CE traffic cannot return. For this case the actual issue is the ce-facing import policy is not accepting those routes, and the relevant success signal is Eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

Question 595

An L3VPN gateway CE and PE run BGP. Observed: The PE does not export the agreed customer prefixes into its VRF. What is the most likely source of the observed routing or service failure?

  1. Return-route exchange from the new site into its local VRF is missing.
  2. RT policy permits an alternate direct path that avoids the approved service chain.
  3. The CE-facing import policy is not accepting those routes.
  4. The service label maps to an unexpected forwarding table or VRF.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: The PE does not export the agreed customer prefixes into its VRF. The specified root issue is The CE-facing import policy is not accepting those routes. Repair it through adjust customer-specific CE-to-PE route admission and VRF propagation policy, then check eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains the remote pe sees the updated vpnv4 prefix but ce traffic cannot return, not the pe does not export the agreed customer prefixes into its vrf. This incident is better attributed to the ce-facing import policy is not accepting those routes.

B:

That explanation fits another condition: One tenant bypasses inspection due to a direct imported route. The evidence here is The PE does not export the agreed customer prefixes into its VRF. Its closer root cause is The CE-facing import policy is not accepting those routes.

D:

The service label maps to an unexpected forwarding table or VRF. would normally be accompanied by customer vpn packets arrive with a valid label but are dropped during vrf lookup. The observed symptom is different: The PE does not export the agreed customer prefixes into its VRF. The likely cause is The CE-facing import policy is not accepting those routes.

Question 596

An L3VPN gateway CE and PE run BGP. Observed: The PE does not export the agreed customer prefixes into its VRF. What operational check best guards against this problem returning?

  1. For each approved related change, verify that inbound labeled packets resolve into the intended customer's VRF. Flag recurrence if customer VPN packets arrive with a valid label but are dropped during VRF lookup.
  2. 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.
  3. For each approved related change, verify that eligible CE prefixes enter the correct VRF and appear in remote VPN sites. Flag recurrence if the PE does not export the agreed customer prefixes into its VRF.
  4. 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.

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (Eligible CE prefixes enter the correct VRF and appear in remote VPN sites) and flags recurrence of the same failure (The PE does not export the agreed customer prefixes into its VRF). It targets the underlying issue, the ce-facing import policy is not accepting those routes, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, customer vpn packets arrive with a valid label but are dropped during vrf lookup. It would not detect the current problem: The PE does not export the agreed customer prefixes into its VRF. The appropriate check requires eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

B:

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 the pe does not export the agreed customer prefixes into its vrf and evidence that eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

D:

The proposed control is tied to return-route exchange from the new site into its local vrf is missing, typically observed when the remote PE sees the updated VPNv4 prefix but CE traffic cannot return. Here the target is the ce-facing import policy is not accepting those routes; monitor eligible CE prefixes enter the correct VRF and appear in remote VPN sites.

Question 597

A PE is configured with a VRF table label for aggregated forwarding. Observed: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. Which targeted remediation is most appropriate for the observed condition?

  1. Define route-policy preference for the primary and backup CE advertisements.
  2. Remove unintended master-table import and implement a scoped VPN-only default.
  3. Correct VRF label association and inspect MPLS service-label forwarding state.
  4. Configure supported inet6 VPN family and per-VRF IPv6 routing policies.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Customer VPN packets arrive with a valid label but are dropped during VRF lookup—is consistent with the service label maps to an unexpected forwarding table or vrf. Use the specified correction, then verify: Inbound labeled packets resolve into the intended customer's VRF. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This remediates pe inbound route preference does not reflect the customer's intended ce priority, normally indicated by The VPN intermittently chooses the slower CE even though the primary is healthy. It would leave the observed problem (Customer VPN packets arrive with a valid label but are dropped during VRF lookup) unresolved. Address it with correct VRF label association and inspect MPLS service-label forwarding state.

B:

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 Customer VPN packets arrive with a valid label but are dropped during VRF lookup. It instead requires correct VRF label association and inspect MPLS service-label forwarding state.

D:

The option may be useful when iPv4 L3VPN works but VPNv6 routes do not reach remote PEs, but that is not the current evidence. Here, customer VPN packets arrive with a valid label but are dropped during VRF lookup, indicating the service label maps to an unexpected forwarding table or vrf. The targeted action is Correct VRF label association and inspect MPLS service-label forwarding state.

Question 598

A PE is configured with a VRF table label for aggregated forwarding. Observed: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. What evidence would validate recovery from this precise failure mode?

  1. Inbound labeled packets resolve into the intended customer's VRF.
  2. Core routing stays independent and tenant Internet access follows its authorized path.
  3. VPNv6 reachability appears only at authorized remote IPv6 sites.
  4. The VPN picks the correct site under normal and simulated failure.

Explanation

Correct Answer

A:

The intended result is Inbound labeled packets resolve into the intended customer's VRF. It specifically verifies recovery from the service label maps to an unexpected forwarding table or vrf, which produced the original symptom: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

B:

It confirms an unrelated service correction: A route leak was configured in the wrong direction between master and tenant VRFs. The present case reports Customer VPN packets arrive with a valid label but are dropped during VRF lookup. Its completion test is Inbound labeled packets resolve into the intended customer's VRF.

C:

That observation would verify a separate fault involving mp-bgp vpnv6 family and vrf ipv6 route exchange were not enabled consistently. Its symptom is IPv4 L3VPN works but VPNv6 routes do not reach remote PEs. For this case the actual issue is the service label maps to an unexpected forwarding table or vrf, and the relevant success signal is Inbound labeled packets resolve into the intended customer's VRF.

D:

This result is useful in another case with evidence The VPN intermittently chooses the slower CE even though the primary is healthy. It does not test recovery from customer vpn packets arrive with a valid label but are dropped during vrf lookup. Check instead whether inbound labeled packets resolve into the intended customer's VRF.

Question 599

A PE is configured with a VRF table label for aggregated forwarding. Observed: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. What underlying protocol or service configuration problem best explains the evidence?

  1. A route leak was configured in the wrong direction between master and tenant VRFs.
  2. PE inbound route preference does not reflect the customer's intended CE priority.
  3. The service label maps to an unexpected forwarding table or VRF.
  4. MP-BGP VPNv6 family and VRF IPv6 route exchange were not enabled consistently.

Explanation

Correct Answer

C:

Because customer VPN packets arrive with a valid label but are dropped during VRF lookup, the likely cause is the service label maps to an unexpected forwarding table or vrf. It is testable: Correct VRF label association and inspect MPLS service-label forwarding state. Expected follow-up: Inbound labeled packets resolve into the intended customer's VRF.

Incorrect Answers

A:

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: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. The likely cause is The service label maps to an unexpected forwarding table or VRF.

B:

That explanation fits another condition: The VPN intermittently chooses the slower CE even though the primary is healthy. The evidence here is Customer VPN packets arrive with a valid label but are dropped during VRF lookup. Its closer root cause is The service label maps to an unexpected forwarding table or VRF.

D:

The stated cause is possible elsewhere but explains ipv4 l3vpn works but vpnv6 routes do not reach remote pes, not customer vpn packets arrive with a valid label but are dropped during vrf lookup. This incident is better attributed to the service label maps to an unexpected forwarding table or vrf.

Question 600

A PE is configured with a VRF table label for aggregated forwarding. Observed: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that vPNv6 reachability appears only at authorized remote IPv6 sites. Flag recurrence if iPv4 L3VPN works but VPNv6 routes do not reach remote PEs.
  2. For each approved related change, verify that inbound labeled packets resolve into the intended customer's VRF. Flag recurrence if customer VPN packets arrive with a valid label but are dropped during VRF lookup.
  3. 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.
  4. For each approved related change, verify that the VPN picks the correct site under normal and simulated failure. Flag recurrence if the VPN intermittently chooses the slower CE even though the primary is healthy.

Explanation

Correct Answer

B:

A useful regression gate tests whether inbound labeled packets resolve into the intended customer's VRF and alerts when customer VPN packets arrive with a valid label but are dropped during VRF lookup. This directly checks the technical weakness: The service label maps to an unexpected forwarding table or VRF. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

The proposed control is tied to mp-bgp vpnv6 family and vrf ipv6 route exchange were not enabled consistently, typically observed when iPv4 L3VPN works but VPNv6 routes do not reach remote PEs. Here the target is the service label maps to an unexpected forwarding table or vrf; monitor inbound labeled packets resolve into the intended customer's VRF.

C:

This gate monitors a different failure, core transit traffic starts following a customer internet gateway. It would not detect the current problem: Customer VPN packets arrive with a valid label but are dropped during VRF lookup. The appropriate check requires inbound labeled packets resolve into the intended customer's VRF.

D:

It is valid for another service scenario but checks the vpn intermittently chooses the slower ce even though the primary is healthy. This case instead needs a gate for customer vpn packets arrive with a valid label but are dropped during vrf lookup and evidence that inbound labeled packets resolve into the intended customer's VRF.

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