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 67

Question 660

A PE deploys IPv6 VPN on a dual-stack customer service. Observed: IPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that global and tenant IPv6 RIBs remain separate and allowed customer routes work. Flag recurrence if iPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF.
  2. For each approved related change, verify that customer isolation follows the configured RT membership even where IPv4 prefixes overlap. Flag recurrence if operators expect the RD itself to enforce customer route isolation.
  3. For each approved related change, verify that the multihomed site's prefix remains stable without reimport looping. Flag recurrence if both PEs advertise the same CE prefix with inconsistent site-of-origin tags.
  4. For each approved related change, verify that customer ARP and route exchange occur only inside its authorized VRF. Flag recurrence if the configured interface belongs to the master instance instead of its customer VRF.

Explanation

Correct Answer

A:

A useful regression gate tests whether global and tenant IPv6 RIBs remain separate and allowed customer routes work and alerts when iPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. This directly checks the technical weakness: The customer interface or routing family is associated with the wrong routing instance. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

It is valid for another service scenario but checks operators expect the rd itself to enforce customer route isolation. This case instead needs a gate for ipv6 routes leak into the global ipv6 table instead of the tenant's inet6 vrf and evidence that global and tenant IPv6 RIBs remain separate and allowed customer routes work.

C:

The proposed control is tied to site-of-origin extended-community filtering is missing and can cause routing feedback, typically observed when both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Here the target is the customer interface or routing family is associated with the wrong routing instance; monitor global and tenant IPv6 RIBs remain separate and allowed customer routes work.

D:

This gate monitors a different failure, the configured interface belongs to the master instance instead of its customer vrf. It would not detect the current problem: IPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. The appropriate check requires global and tenant IPv6 RIBs remain separate and allowed customer routes work.

Question 661

A multi-homed VPN site requires source-specific route preference. Observed: Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Remove shared RT membership and use a controlled firewall/service-exchange VRF if justified.
  2. Restore the contracted per-VRF border peering and scoped route filtering.
  3. Repair PE loopback IGP reachability and labeled transport to the remote PE.
  4. Apply compatible SOO tagging and route rejection on re-entry.

Explanation

Correct Answer

D:

The observed condition is Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. That indicates site-of-origin extended-community filtering is missing and can cause routing feedback. Applying the proposed remedy directly changes that condition. A concrete completion check is: The multihomed site's prefix remains stable without reimport looping.

Incorrect Answers

A:

This remediates cross-service route-target import is too permissive for overlapping partner addresses, normally indicated by A route received through one partner is installed in the other's VRF. It would leave the observed problem (Both PEs advertise the same CE prefix with inconsistent site-of-origin tags) unresolved. Address it with apply compatible SOO tagging and route rejection on re-entry.

B:

The option may be useful when a customer subnet is absent on the far side while local sites exchange correctly, but that is not the current evidence. Here, both PEs advertise the same CE prefix with inconsistent site-of-origin tags, indicating site-of-origin extended-community filtering is missing and can cause routing feedback. The targeted action is Apply compatible SOO tagging and route rejection on re-entry.

C:

This change belongs to a different Layer 3 VPNs issue: Remote PE imports the route but forwarding fails on the core transit. That issue involves the vpn bgp next hop lacks a resolvable mpls labeled transport path. The current symptom is Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. It instead requires apply compatible SOO tagging and route rejection on re-entry.

Question 662

A multi-homed VPN site requires source-specific route preference. Observed: Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. After the correction, which result would most convincingly show that this fault is resolved?

  1. The authorized VPN subnet is learned across the AS boundary without tenant mixing.
  2. The multihomed site's prefix remains stable without reimport looping.
  3. Partner routes remain isolated except through explicitly approved exchange paths.
  4. The VPN route resolves both transport and service labels and data flows successfully.

Explanation

Correct Answer

B:

After apply compatible SOO tagging and route rejection on re-entry, inspect whether the multihomed site's prefix remains stable without reimport looping. This closes the loop between the reported observation (Both PEs advertise the same CE prefix with inconsistent site-of-origin tags) and the underlying issue (Site-of-origin extended-community filtering is missing and can cause routing feedback).

Incorrect Answers

A:

That observation would verify a separate fault involving the inter-as per-vrf ebgp exchange is missing a route export or prefix permission. Its symptom is A customer subnet is absent on the far side while local sites exchange correctly. For this case the actual issue is site-of-origin extended-community filtering is missing and can cause routing feedback, and the relevant success signal is The multihomed site's prefix remains stable without reimport looping.

C:

This result is useful in another case with evidence A route received through one partner is installed in the other's VRF. It does not test recovery from both pes advertise the same ce prefix with inconsistent site-of-origin tags. Check instead whether the multihomed site's prefix remains stable without reimport looping.

D:

It confirms an unrelated service correction: The VPN BGP next hop lacks a resolvable MPLS labeled transport path. The present case reports Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Its completion test is The multihomed site's prefix remains stable without reimport looping.

Question 663

A multi-homed VPN site requires source-specific route preference. Observed: Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Which root cause is most consistent with this symptom?

  1. The VPN BGP next hop lacks a resolvable MPLS labeled transport path.
  2. The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission.
  3. Cross-service route-target import is too permissive for overlapping partner addresses.
  4. Site-of-origin extended-community filtering is missing and can cause routing feedback.

Explanation

Correct Answer

D:

The reported evidence—Both PEs advertise the same CE prefix with inconsistent site-of-origin tags—supports site-of-origin extended-community filtering is missing and can cause routing feedback. The appropriate intervention is to apply compatible SOO tagging and route rejection on re-entry, with confirmation from the multihomed site's prefix remains stable without reimport looping. Other causes require actual device-state verification.

Incorrect Answers

A:

The VPN BGP next hop lacks a resolvable MPLS labeled transport path. would normally be accompanied by remote pe imports the route but forwarding fails on the core transit. The observed symptom is different: Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. The likely cause is Site-of-origin extended-community filtering is missing and can cause routing feedback.

B:

The stated cause is possible elsewhere but explains a customer subnet is absent on the far side while local sites exchange correctly, not both pes advertise the same ce prefix with inconsistent site-of-origin tags. This incident is better attributed to site-of-origin extended-community filtering is missing and can cause routing feedback.

C:

That explanation fits another condition: A route received through one partner is installed in the other's VRF. The evidence here is Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Its closer root cause is Site-of-origin extended-community filtering is missing and can cause routing feedback.

Question 664

A multi-homed VPN site requires source-specific route preference. Observed: Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that the multihomed site's prefix remains stable without reimport looping. Flag recurrence if both PEs advertise the same CE prefix with inconsistent site-of-origin tags.
  2. For each approved related change, verify that the VPN route resolves both transport and service labels and data flows successfully. Flag recurrence if remote PE imports the route but forwarding fails on the core transit.
  3. For each approved related change, verify that partner routes remain isolated except through explicitly approved exchange paths. Flag recurrence if a route received through one partner is installed in the other's VRF.
  4. For each approved related change, verify that the authorized VPN subnet is learned across the AS boundary without tenant mixing. Flag recurrence if a customer subnet is absent on the far side while local sites exchange correctly.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result The multihomed site's prefix remains stable without reimport looping. and treats Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. as a failure signal. The causal concern is site-of-origin extended-community filtering is missing and can cause routing feedback.

Incorrect Answers

B:

This gate monitors a different failure, remote pe imports the route but forwarding fails on the core transit. It would not detect the current problem: Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. The appropriate check requires the multihomed site's prefix remains stable without reimport looping.

C:

It is valid for another service scenario but checks a route received through one partner is installed in the other's vrf. This case instead needs a gate for both pes advertise the same ce prefix with inconsistent site-of-origin tags and evidence that the multihomed site's prefix remains stable without reimport looping.

D:

The proposed control is tied to the inter-as per-vrf ebgp exchange is missing a route export or prefix permission, typically observed when a customer subnet is absent on the far side while local sites exchange correctly. Here the target is site-of-origin extended-community filtering is missing and can cause routing feedback; monitor the multihomed site's prefix remains stable without reimport looping.

Question 665

A provider edge serves two partners who share the same internal subnet. Observed: A route received through one partner is installed in the other's VRF. What should the routing engineer change first to address this particular symptom?

  1. Configure the supported hierarchical labeled transport service end to end.
  2. Remove shared RT membership and use a controlled firewall/service-exchange VRF if justified.
  3. Redesign spoke RTs to enforce hub-only exchange and maintain required return paths.
  4. Scope RT and prefix exchange through the shared-services VRF to the DNS service only.

Explanation

Correct Answer

B:

The decisive evidence is that A route received through one partner is installed in the other's VRF. This follows from cross-service route-target import is too permissive for overlapping partner addresses. The focused remedy is to remove shared RT membership and use a controlled firewall/service-exchange VRF if justified. Confirm improvement when partner routes remain isolated except through explicitly approved exchange paths. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates the carrier-of-carriers design lacks compatible labeled route distribution and transport resolution, normally indicated by An interprovider labeled packet cannot be forwarded through the upstream core. It would leave the observed problem (A route received through one partner is installed in the other's VRF) unresolved. Address it with remove shared RT membership and use a controlled firewall/service-exchange VRF if justified.

C:

The option may be useful when two spoke sites unexpectedly exchange routes without the central hub, but that is not the current evidence. Here, a route received through one partner is installed in the other's VRF, indicating cross-service route-target import is too permissive for overlapping partner addresses. The targeted action is Remove shared RT membership and use a controlled firewall/service-exchange VRF if justified.

D:

This change belongs to a different Layer 3 VPNs issue: Customer VRFs can reach shared DNS but also import other tenants' direct routes. That issue involves the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability. The current symptom is A route received through one partner is installed in the other's VRF. It instead requires remove shared RT membership and use a controlled firewall/service-exchange VRF if justified.

Question 666

A provider edge serves two partners who share the same internal subnet. Observed: A route received through one partner is installed in the other's VRF. Which acceptance observation best confirms that the proposed change worked?

  1. Partner routes remain isolated except through explicitly approved exchange paths.
  2. Spokes communicate through the hub without direct route import between spokes.
  3. The downstream carrier can forward its labeled traffic across the upstream core.
  4. Only the shared DNS prefixes traverse service VRFs and tenants stay isolated.

Explanation

Correct Answer

A:

This acceptance criterion tests the actual fault. The source evidence was A route received through one partner is installed in the other's VRF. The correction addresses cross-service route-target import is too permissive for overlapping partner addresses; success requires partner routes remain isolated except through explicitly approved exchange paths.

Incorrect Answers

B:

That observation would verify a separate fault involving spoke import/export rt policy grants direct spoke route membership. Its symptom is Two spoke sites unexpectedly exchange routes without the central hub. For this case the actual issue is cross-service route-target import is too permissive for overlapping partner addresses, and the relevant success signal is Partner routes remain isolated except through explicitly approved exchange paths.

C:

This result is useful in another case with evidence An interprovider labeled packet cannot be forwarded through the upstream core. It does not test recovery from a route received through one partner is installed in the other's vrf. Check instead whether partner routes remain isolated except through explicitly approved exchange paths.

D:

It confirms an unrelated service correction: The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability. The present case reports A route received through one partner is installed in the other's VRF. Its completion test is Partner routes remain isolated except through explicitly approved exchange paths.

Question 667

A provider edge serves two partners who share the same internal subnet. Observed: A route received through one partner is installed in the other's VRF. What is the most likely source of the observed routing or service failure?

  1. The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability.
  2. The carrier-of-carriers design lacks compatible labeled route distribution and transport resolution.
  3. Spoke import/export RT policy grants direct spoke route membership.
  4. Cross-service route-target import is too permissive for overlapping partner addresses.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: A route received through one partner is installed in the other's VRF. The specified root issue is Cross-service route-target import is too permissive for overlapping partner addresses. Repair it through remove shared RT membership and use a controlled firewall/service-exchange VRF if justified, then check partner routes remain isolated except through explicitly approved exchange paths.

Incorrect Answers

A:

The shared-services exchange uses transit RTs that permit uncontrolled customer-to-customer reachability. would normally be accompanied by customer vrfs can reach shared dns but also import other tenants' direct routes. The observed symptom is different: A route received through one partner is installed in the other's VRF. The likely cause is Cross-service route-target import is too permissive for overlapping partner addresses.

B:

That explanation fits another condition: An interprovider labeled packet cannot be forwarded through the upstream core. The evidence here is A route received through one partner is installed in the other's VRF. Its closer root cause is Cross-service route-target import is too permissive for overlapping partner addresses.

C:

The stated cause is possible elsewhere but explains two spoke sites unexpectedly exchange routes without the central hub, not a route received through one partner is installed in the other's vrf. This incident is better attributed to cross-service route-target import is too permissive for overlapping partner addresses.

Question 668

A provider edge serves two partners who share the same internal subnet. Observed: A route received through one partner is installed in the other's VRF. What operational check best guards against this problem returning?

  1. For each approved related change, verify that partner routes remain isolated except through explicitly approved exchange paths. Flag recurrence if a route received through one partner is installed in the other's VRF.
  2. For each approved related change, verify that spokes communicate through the hub without direct route import between spokes. Flag recurrence if two spoke sites unexpectedly exchange routes without the central hub.
  3. For each approved related change, verify that the downstream carrier can forward its labeled traffic across the upstream core. Flag recurrence if an interprovider labeled packet cannot be forwarded through the upstream core.
  4. 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.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (Partner routes remain isolated except through explicitly approved exchange paths) and flags recurrence of the same failure (A route received through one partner is installed in the other's VRF). It targets the underlying issue, cross-service route-target import is too permissive for overlapping partner addresses, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

The proposed control is tied to spoke import/export rt policy grants direct spoke route membership, typically observed when two spoke sites unexpectedly exchange routes without the central hub. Here the target is cross-service route-target import is too permissive for overlapping partner addresses; monitor partner routes remain isolated except through explicitly approved exchange paths.

C:

It is valid for another service scenario but checks an interprovider labeled packet cannot be forwarded through the upstream core. This case instead needs a gate for a route received through one partner is installed in the other's vrf and evidence that partner routes remain isolated except through explicitly approved exchange paths.

D:

This gate monitors a different failure, customer vrfs can reach shared dns but also import other tenants' direct routes. It would not detect the current problem: A route received through one partner is installed in the other's VRF. The appropriate check requires partner routes remain isolated except through explicitly approved exchange paths.

Question 669

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 targeted remediation is most appropriate for the observed condition?

  1. Scope RT and prefix exchange through the shared-services VRF to the DNS service only.
  2. Restore transport label distribution and add appropriate next-hop tracking.
  3. Restore the intended per-VRF primary/backup BGP route policy.
  4. Add the approved VPN membership RT set while retaining unrelated route filtering.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Customer VRFs can reach shared DNS but also import other tenants' direct routes—is consistent with the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability. Use the specified correction, then verify: Only the shared DNS prefixes traverse service VRFs and tenants stay isolated. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

The option may be useful when vPN route remains active at PEs despite loss of the underlying labeled transport, but that is not the current evidence. Here, customer VRFs can reach shared DNS but also import other tenants' direct routes, indicating the shared-services exchange uses transit rts that permit uncontrolled customer-to-customer reachability. The targeted action is Scope RT and prefix exchange through the shared-services VRF to the DNS service only.

C:

This change belongs to a different Layer 3 VPNs issue: A remote PE selects the backup site because the route policy overwrote local preference. That issue involves the vpn import policy modifies best-path attributes inconsistently. The current symptom is Customer VRFs can reach shared DNS but also import other tenants' direct routes. It instead requires scope RT and prefix exchange through the shared-services VRF to the DNS service only.

D:

This remediates the new site imports an incomplete set of route targets for the vpn, normally indicated by The new VRF learns only one existing site after provisioning. It would leave the observed problem (Customer VRFs can reach shared DNS but also import other tenants' direct routes) unresolved. Address it with scope RT and prefix exchange through the shared-services VRF to the DNS service only.

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.

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