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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 58

Question 570

A provider L3VPN design uses identical route distinguishers for two sites. Observed: Operators expect the RD itself to enforce customer route isolation. Which acceptance observation best confirms that the proposed change worked?

  1. Receivers in the remote VPN get the correct multicast stream without cross-tenant delivery.
  2. The VPN route resolves both transport and service labels and data flows successfully.
  3. Only subscribed customers receive the shared breakout route.
  4. Customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was Operators expect the RD itself to enforce customer route isolation. The correction addresses a route distinguisher provides nlri uniqueness, not import-policy membership; success requires customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

Incorrect Answers

A:

This result is useful in another case with evidence Customer multicast control signaling exists but payload delivery fails at a remote PE. It does not test recovery from operators expect the rd itself to enforce customer route isolation. Check instead whether customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

B:

It confirms an unrelated service correction: The VPN BGP next hop lacks a resolvable MPLS labeled transport path. The present case reports Operators expect the RD itself to enforce customer route isolation. Its completion test is Customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

C:

That observation would verify a separate fault involving broad rt import/export policy exposed the default across unrelated vpns. Its symptom is One customer's default route is accidentally propagated to every tenant. For this case the actual issue is a route distinguisher provides nlri uniqueness, not import-policy membership, and the relevant success signal is Customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

Question 571

A provider L3VPN design uses identical route distinguishers for two sites. Observed: Operators expect the RD itself to enforce customer route isolation. What is the most likely source of the observed routing or service failure?

  1. The VPN BGP next hop lacks a resolvable MPLS labeled transport path.
  2. A route distinguisher provides NLRI uniqueness, not import-policy membership.
  3. Broad RT import/export policy exposed the default across unrelated VPNs.
  4. MVPN provider-tunnel encapsulation or multicast transport mapping is inconsistent.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: Operators expect the RD itself to enforce customer route isolation. The specified root issue is A route distinguisher provides NLRI uniqueness, not import-policy membership. Repair it through use route targets for import/export policy and RDs only for uniqueness as appropriate, then check customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

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: Operators expect the RD itself to enforce customer route isolation. The likely cause is A route distinguisher provides NLRI uniqueness, not import-policy membership.

C:

The stated cause is possible elsewhere but explains one customer's default route is accidentally propagated to every tenant, not operators expect the rd itself to enforce customer route isolation. This incident is better attributed to a route distinguisher provides nlri uniqueness, not import-policy membership.

D:

That explanation fits another condition: Customer multicast control signaling exists but payload delivery fails at a remote PE. The evidence here is Operators expect the RD itself to enforce customer route isolation. Its closer root cause is A route distinguisher provides NLRI uniqueness, not import-policy membership.

Question 572

A provider L3VPN design uses identical route distinguishers for two sites. Observed: Operators expect the RD itself to enforce customer route isolation. What operational check best guards against this problem returning?

  1. 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.
  2. For each approved related change, verify that receivers in the remote VPN get the correct multicast stream without cross-tenant delivery. Flag recurrence if customer multicast control signaling exists but payload delivery fails at a remote PE.
  3. For each approved related change, verify that only subscribed customers receive the shared breakout route. Flag recurrence if one customer's default route is accidentally propagated to every tenant.
  4. 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.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (Customer isolation follows the configured RT membership even where IPv4 prefixes overlap) and flags recurrence of the same failure (Operators expect the RD itself to enforce customer route isolation). It targets the underlying issue, a route distinguisher provides nlri uniqueness, not import-policy membership, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

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: Operators expect the RD itself to enforce customer route isolation. The appropriate check requires customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

B:

It is valid for another service scenario but checks customer multicast control signaling exists but payload delivery fails at a remote pe. This case instead needs a gate for operators expect the rd itself to enforce customer route isolation and evidence that customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

C:

The proposed control is tied to broad rt import/export policy exposed the default across unrelated vpns, typically observed when one customer's default route is accidentally propagated to every tenant. Here the target is a route distinguisher provides nlri uniqueness, not import-policy membership; monitor customer isolation follows the configured RT membership even where IPv4 prefixes overlap.

Question 573

A PE originates a customer IPv4 route into VPNv4 BGP. Observed: Remote PE imports the route but forwarding fails on the core transit. Which targeted remediation is most appropriate for the observed condition?

  1. Assign inet6 routes to the proper tenant instance and explicitly control exports.
  2. Assign the interface to the correct VRF and verify route learning.
  3. Redesign spoke RTs to enforce hub-only exchange and maintain required return paths.
  4. Repair PE loopback IGP reachability and labeled transport to the remote PE.

Explanation

Correct Answer

D:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Remote PE imports the route but forwarding fails on the core transit—is consistent with the vpn bgp next hop lacks a resolvable mpls labeled transport path. Use the specified correction, then verify: The VPN route resolves both transport and service labels and data flows successfully. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different Layer 3 VPNs issue: IPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. That issue involves the customer interface or routing family is associated with the wrong routing instance. The current symptom is Remote PE imports the route but forwarding fails on the core transit. It instead requires repair PE loopback IGP reachability and labeled transport to the remote PE.

B:

This remediates the customer-facing logical interface was not bound to the intended routing instance, normally indicated by The configured interface belongs to the master instance instead of its customer VRF. It would leave the observed problem (Remote PE imports the route but forwarding fails on the core transit) unresolved. Address it with repair PE loopback IGP reachability and labeled transport to the remote PE.

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, remote PE imports the route but forwarding fails on the core transit, indicating the vpn bgp next hop lacks a resolvable mpls labeled transport path. The targeted action is Repair PE loopback IGP reachability and labeled transport to the remote PE.

Question 574

A PE originates a customer IPv4 route into VPNv4 BGP. Observed: Remote PE imports the route but forwarding fails on the core transit. What evidence would validate recovery from this precise failure mode?

  1. The VPN route resolves both transport and service labels and data flows successfully.
  2. Global and tenant IPv6 RIBs remain separate and allowed customer routes work.
  3. Spokes communicate through the hub without direct route import between spokes.
  4. Customer ARP and route exchange occur only inside its authorized VRF.

Explanation

Correct Answer

A:

The intended result is The VPN route resolves both transport and service labels and data flows successfully. It specifically verifies recovery from the vpn bgp next hop lacks a resolvable mpls labeled transport path, which produced the original symptom: Remote PE imports the route but forwarding fails on the core transit. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

B:

It confirms an unrelated service correction: The customer interface or routing family is associated with the wrong routing instance. The present case reports Remote PE imports the route but forwarding fails on the core transit. Its completion test is The VPN route resolves both transport and service labels and data flows successfully.

C:

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 the vpn bgp next hop lacks a resolvable mpls labeled transport path, and the relevant success signal is The VPN route resolves both transport and service labels and data flows successfully.

D:

This result is useful in another case with evidence The configured interface belongs to the master instance instead of its customer VRF. It does not test recovery from remote pe imports the route but forwarding fails on the core transit. Check instead whether the VPN route resolves both transport and service labels and data flows successfully.

Question 575

A PE originates a customer IPv4 route into VPNv4 BGP. Observed: Remote PE imports the route but forwarding fails on the core transit. What underlying protocol or service configuration problem best explains the evidence?

  1. The VPN BGP next hop lacks a resolvable MPLS labeled transport path.
  2. The customer interface or routing family is associated with the wrong routing instance.
  3. The customer-facing logical interface was not bound to the intended routing instance.
  4. Spoke import/export RT policy grants direct spoke route membership.

Explanation

Correct Answer

A:

Because remote PE imports the route but forwarding fails on the core transit, the likely cause is the vpn bgp next hop lacks a resolvable mpls labeled transport path. It is testable: Repair PE loopback IGP reachability and labeled transport to the remote PE. Expected follow-up: The VPN route resolves both transport and service labels and data flows successfully.

Incorrect Answers

B:

The customer interface or routing family is associated with the wrong routing instance. would normally be accompanied by ipv6 routes leak into the global ipv6 table instead of the tenant's inet6 vrf. The observed symptom is different: Remote PE imports the route but forwarding fails on the core transit. The likely cause is The VPN BGP next hop lacks a resolvable MPLS labeled transport path.

C:

That explanation fits another condition: The configured interface belongs to the master instance instead of its customer VRF. The evidence here is Remote PE imports the route but forwarding fails on the core transit. Its closer root cause is The VPN BGP next hop lacks a resolvable MPLS labeled transport path.

D:

The stated cause is possible elsewhere but explains two spoke sites unexpectedly exchange routes without the central hub, not remote pe imports the route but forwarding fails on the core transit. This incident is better attributed to the vpn bgp next hop lacks a resolvable mpls labeled transport path.

Question 576

A PE originates a customer IPv4 route into VPNv4 BGP. Observed: Remote PE imports the route but forwarding fails on the core transit. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  2. 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.
  3. 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.
  4. 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.

Explanation

Correct Answer

A:

A useful regression gate tests whether the VPN route resolves both transport and service labels and data flows successfully and alerts when remote PE imports the route but forwarding fails on the core transit. This directly checks the technical weakness: The VPN BGP next hop lacks a resolvable MPLS labeled transport path. 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 the configured interface belongs to the master instance instead of its customer vrf. This case instead needs a gate for remote pe imports the route but forwarding fails on the core transit and evidence that the VPN route resolves both transport and service labels and data flows successfully.

C:

This gate monitors a different failure, ipv6 routes leak into the global ipv6 table instead of the tenant's inet6 vrf. It would not detect the current problem: Remote PE imports the route but forwarding fails on the core transit. The appropriate check requires the VPN route resolves both transport and service labels and data flows successfully.

D:

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 the vpn bgp next hop lacks a resolvable mpls labeled transport path; monitor the VPN route resolves both transport and service labels and data flows successfully.

Question 577

A hub-and-spoke enterprise VPN should prevent direct spoke connectivity. Observed: Two spoke sites unexpectedly exchange routes without the central hub. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Apply compatible SOO tagging and route rejection on re-entry.
  2. Redesign spoke RTs to enforce hub-only exchange and maintain required return paths.
  3. Add the approved VPN membership RT set while retaining unrelated route filtering.
  4. Restore the contracted per-VRF border peering and scoped route filtering.

Explanation

Correct Answer

B:

The observed condition is Two spoke sites unexpectedly exchange routes without the central hub. That indicates spoke import/export rt policy grants direct spoke route membership. Applying the proposed remedy directly changes that condition. A concrete completion check is: Spokes communicate through the hub without direct route import between spokes.

Incorrect Answers

A:

The option may be useful when both PEs advertise the same CE prefix with inconsistent site-of-origin tags, but that is not the current evidence. Here, two spoke sites unexpectedly exchange routes without the central hub, indicating spoke import/export rt policy grants direct spoke route membership. The targeted action is Redesign spoke RTs to enforce hub-only exchange and maintain required return paths.

C:

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 (Two spoke sites unexpectedly exchange routes without the central hub) unresolved. Address it with redesign spoke RTs to enforce hub-only exchange and maintain required return paths.

D:

This change belongs to a different Layer 3 VPNs issue: A customer subnet is absent on the far side while local sites exchange correctly. That issue involves the inter-as per-vrf ebgp exchange is missing a route export or prefix permission. The current symptom is Two spoke sites unexpectedly exchange routes without the central hub. It instead requires redesign spoke RTs to enforce hub-only exchange and maintain required return paths.

Question 578

A hub-and-spoke enterprise VPN should prevent direct spoke connectivity. Observed: Two spoke sites unexpectedly exchange routes without the central hub. After the correction, which result would most convincingly show that this fault is resolved?

  1. Spokes communicate through the hub without direct route import between spokes.
  2. All full-mesh sites exchange permitted prefixes with the new CE.
  3. The authorized VPN subnet is learned across the AS boundary without tenant mixing.
  4. The multihomed site's prefix remains stable without reimport looping.

Explanation

Correct Answer

A:

After redesign spoke RTs to enforce hub-only exchange and maintain required return paths, inspect whether spokes communicate through the hub without direct route import between spokes. This closes the loop between the reported observation (Two spoke sites unexpectedly exchange routes without the central hub) and the underlying issue (Spoke import/export RT policy grants direct spoke route membership).

Incorrect Answers

B:

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 two spoke sites unexpectedly exchange routes without the central hub. Check instead whether spokes communicate through the hub without direct route import between spokes.

C:

It confirms an unrelated service correction: The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission. The present case reports Two spoke sites unexpectedly exchange routes without the central hub. Its completion test is Spokes communicate through the hub without direct route import between spokes.

D:

That observation would verify a separate fault involving site-of-origin extended-community filtering is missing and can cause routing feedback. Its symptom is Both PEs advertise the same CE prefix with inconsistent site-of-origin tags. For this case the actual issue is spoke import/export rt policy grants direct spoke route membership, and the relevant success signal is Spokes communicate through the hub without direct route import between spokes.

Question 579

A hub-and-spoke enterprise VPN should prevent direct spoke connectivity. Observed: Two spoke sites unexpectedly exchange routes without the central hub. Which root cause is most consistent with this symptom?

  1. Site-of-origin extended-community filtering is missing and can cause routing feedback.
  2. Spoke import/export RT policy grants direct spoke route membership.
  3. The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission.
  4. The new site imports an incomplete set of route targets for the VPN.

Explanation

Correct Answer

B:

The reported evidence—Two spoke sites unexpectedly exchange routes without the central hub—supports spoke import/export rt policy grants direct spoke route membership. The appropriate intervention is to redesign spoke RTs to enforce hub-only exchange and maintain required return paths, with confirmation from spokes communicate through the hub without direct route import between spokes. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains both pes advertise the same ce prefix with inconsistent site-of-origin tags, not two spoke sites unexpectedly exchange routes without the central hub. This incident is better attributed to spoke import/export rt policy grants direct spoke route membership.

C:

The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission. would normally be accompanied by a customer subnet is absent on the far side while local sites exchange correctly. The observed symptom is different: Two spoke sites unexpectedly exchange routes without the central hub. The likely cause is Spoke import/export RT policy grants direct spoke route membership.

D:

That explanation fits another condition: The new VRF learns only one existing site after provisioning. The evidence here is Two spoke sites unexpectedly exchange routes without the central hub. Its closer root cause is Spoke import/export RT policy grants direct spoke route membership.

Question 580

A hub-and-spoke enterprise VPN should prevent direct spoke connectivity. Observed: Two spoke sites unexpectedly exchange routes without the central hub. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  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 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 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 Spokes communicate through the hub without direct route import between spokes. and treats Two spoke sites unexpectedly exchange routes without the central hub. as a failure signal. The causal concern is spoke import/export rt policy grants direct spoke route membership.

Incorrect Answers

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 two spoke sites unexpectedly exchange routes without the central hub and evidence that spokes communicate through the hub without direct route import between spokes.

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 spoke import/export rt policy grants direct spoke route membership; monitor spokes communicate through the hub without direct route import between spokes.

D:

This gate monitors a different failure, a customer subnet is absent on the far side while local sites exchange correctly. It would not detect the current problem: Two spoke sites unexpectedly exchange routes without the central hub. The appropriate check requires spokes communicate through the hub without direct route import between spokes.

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