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

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Juniper JN0-664 Practice Test 62

Question 610

A centralized Internet breakout changes a PE security policy. Observed: One customer's default route is accidentally propagated to every tenant. What evidence would validate recovery from this precise failure mode?

  1. Customer ARP and route exchange occur only inside its authorized VRF.
  2. Customer route tables exclude core loopbacks while customer service remains intact.
  3. The remote VRF imports only the intended VPN prefix and the site becomes reachable.
  4. Only subscribed customers receive the shared breakout route.

Explanation

Correct Answer

D:

The intended result is Only subscribed customers receive the shared breakout route. It specifically verifies recovery from broad rt import/export policy exposed the default across unrelated vpns, which produced the original symptom: One customer's default route is accidentally propagated to every tenant. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving the customer-facing logical interface was not bound to the intended routing instance. Its symptom is The configured interface belongs to the master instance instead of its customer VRF. For this case the actual issue is broad rt import/export policy exposed the default across unrelated vpns, and the relevant success signal is Only subscribed customers receive the shared breakout route.

B:

This result is useful in another case with evidence Provider-wide BGP policy accidentally imports the provider loopback into a customer VRF. It does not test recovery from one customer's default route is accidentally propagated to every tenant. Check instead whether only subscribed customers receive the shared breakout route.

C:

It confirms an unrelated service correction: The remote VRF does not import the route's export route target. The present case reports One customer's default route is accidentally propagated to every tenant. Its completion test is Only subscribed customers receive the shared breakout route.

Question 611

A centralized Internet breakout changes a PE security policy. Observed: One customer's default route is accidentally propagated to every tenant. What underlying protocol or service configuration problem best explains the evidence?

  1. The import policy lacks explicit provider-infrastructure prefix exclusion.
  2. The customer-facing logical interface was not bound to the intended routing instance.
  3. Broad RT import/export policy exposed the default across unrelated VPNs.
  4. The remote VRF does not import the route's export route target.

Explanation

Correct Answer

C:

Because one customer's default route is accidentally propagated to every tenant, the likely cause is broad rt import/export policy exposed the default across unrelated vpns. It is testable: Scope Internet default RT membership to contracted tenant VRFs only. Expected follow-up: Only subscribed customers receive the shared breakout route.

Incorrect Answers

A:

That explanation fits another condition: Provider-wide BGP policy accidentally imports the provider loopback into a customer VRF. The evidence here is One customer's default route is accidentally propagated to every tenant. Its closer root cause is Broad RT import/export policy exposed the default across unrelated VPNs.

B:

The stated cause is possible elsewhere but explains the configured interface belongs to the master instance instead of its customer vrf, not one customer's default route is accidentally propagated to every tenant. This incident is better attributed to broad rt import/export policy exposed the default across unrelated vpns.

D:

The remote VRF does not import the route's export route target. would normally be accompanied by the customer route has a vpnv4 nlri but is missing on a remote pe. The observed symptom is different: One customer's default route is accidentally propagated to every tenant. The likely cause is Broad RT import/export policy exposed the default across unrelated VPNs.

Question 612

A centralized Internet breakout changes a PE security policy. Observed: One customer's default route is accidentally propagated to every tenant. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  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 the remote VRF imports only the intended VPN prefix and the site becomes reachable. Flag recurrence if the customer route has a VPNv4 NLRI but is missing on a remote PE.
  4. For each approved related change, verify that customer route tables exclude core loopbacks while customer service remains intact. Flag recurrence if provider-wide BGP policy accidentally imports the provider loopback into a customer VRF.

Explanation

Correct Answer

A:

A useful regression gate tests whether only subscribed customers receive the shared breakout route and alerts when one customer's default route is accidentally propagated to every tenant. This directly checks the technical weakness: Broad RT import/export policy exposed the default across unrelated VPNs. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

The proposed control is tied to the customer-facing logical interface was not bound to the intended routing instance, typically observed when the configured interface belongs to the master instance instead of its customer VRF. Here the target is broad rt import/export policy exposed the default across unrelated vpns; monitor only subscribed customers receive the shared breakout route.

C:

This gate monitors a different failure, the customer route has a vpnv4 nlri but is missing on a remote pe. It would not detect the current problem: One customer's default route is accidentally propagated to every tenant. The appropriate check requires only subscribed customers receive the shared breakout route.

D:

It is valid for another service scenario but checks provider-wide bgp policy accidentally imports the provider loopback into a customer vrf. This case instead needs a gate for one customer's default route is accidentally propagated to every tenant and evidence that only subscribed customers receive the shared breakout route.

Question 613

A company uses multiple VPN routing instances on one PE. Observed: The configured interface belongs to the master instance instead of its customer VRF. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Use route targets for import/export policy and RDs only for uniqueness as appropriate.
  2. Assign the interface to the correct VRF and verify route learning.
  3. Restore the contracted per-VRF border peering and scoped route filtering.
  4. Match the supported MVPN transport profile and customer multicast state.

Explanation

Correct Answer

B:

The observed condition is The configured interface belongs to the master instance instead of its customer VRF. That indicates the customer-facing logical interface was not bound to the intended routing instance. Applying the proposed remedy directly changes that condition. A concrete completion check is: Customer ARP and route exchange occur only inside its authorized VRF.

Incorrect Answers

A:

The option may be useful when operators expect the RD itself to enforce customer route isolation, but that is not the current evidence. Here, the configured interface belongs to the master instance instead of its customer VRF, indicating the customer-facing logical interface was not bound to the intended routing instance. The targeted action is Assign the interface to the correct VRF and verify route learning.

C:

This remediates the inter-as per-vrf ebgp exchange is missing a route export or prefix permission, normally indicated by A customer subnet is absent on the far side while local sites exchange correctly. It would leave the observed problem (The configured interface belongs to the master instance instead of its customer VRF) unresolved. Address it with assign the interface to the correct VRF and verify route learning.

D:

This change belongs to a different Layer 3 VPNs issue: Customer multicast control signaling exists but payload delivery fails at a remote PE. That issue involves mvpn provider-tunnel encapsulation or multicast transport mapping is inconsistent. The current symptom is The configured interface belongs to the master instance instead of its customer VRF. It instead requires assign the interface to the correct VRF and verify route learning.

Question 614

A company uses multiple VPN routing instances on one PE. Observed: The configured interface belongs to the master instance instead of its customer VRF. 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. Customer ARP and route exchange occur only inside its authorized VRF.
  3. Customer isolation follows the configured RT membership even where IPv4 prefixes overlap.
  4. Receivers in the remote VPN get the correct multicast stream without cross-tenant delivery.

Explanation

Correct Answer

B:

After assign the interface to the correct VRF and verify route learning, inspect whether customer ARP and route exchange occur only inside its authorized VRF. This closes the loop between the reported observation (The configured interface belongs to the master instance instead of its customer VRF) and the underlying issue (The customer-facing logical interface was not bound to the intended routing instance).

Incorrect Answers

A:

This result is useful in another case with evidence A customer subnet is absent on the far side while local sites exchange correctly. It does not test recovery from the configured interface belongs to the master instance instead of its customer vrf. Check instead whether customer ARP and route exchange occur only inside its authorized VRF.

C:

That observation would verify a separate fault involving a route distinguisher provides nlri uniqueness, not import-policy membership. Its symptom is Operators expect the RD itself to enforce customer route isolation. For this case the actual issue is the customer-facing logical interface was not bound to the intended routing instance, and the relevant success signal is Customer ARP and route exchange occur only inside its authorized VRF.

D:

It confirms an unrelated service correction: MVPN provider-tunnel encapsulation or multicast transport mapping is inconsistent. The present case reports The configured interface belongs to the master instance instead of its customer VRF. Its completion test is Customer ARP and route exchange occur only inside its authorized VRF.

Question 615

A company uses multiple VPN routing instances on one PE. Observed: The configured interface belongs to the master instance instead of its customer VRF. Which root cause is most consistent with this symptom?

  1. The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission.
  2. MVPN provider-tunnel encapsulation or multicast transport mapping is inconsistent.
  3. The customer-facing logical interface was not bound to the intended routing instance.
  4. A route distinguisher provides NLRI uniqueness, not import-policy membership.

Explanation

Correct Answer

C:

The reported evidence—The configured interface belongs to the master instance instead of its customer VRF—supports the customer-facing logical interface was not bound to the intended routing instance. The appropriate intervention is to assign the interface to the correct VRF and verify route learning, with confirmation from customer ARP and route exchange occur only inside its authorized VRF. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: A customer subnet is absent on the far side while local sites exchange correctly. The evidence here is The configured interface belongs to the master instance instead of its customer VRF. Its closer root cause is The customer-facing logical interface was not bound to the intended routing instance.

B:

MVPN provider-tunnel encapsulation or multicast transport mapping is inconsistent. would normally be accompanied by customer multicast control signaling exists but payload delivery fails at a remote pe. The observed symptom is different: The configured interface belongs to the master instance instead of its customer VRF. The likely cause is The customer-facing logical interface was not bound to the intended routing instance.

D:

The stated cause is possible elsewhere but explains operators expect the rd itself to enforce customer route isolation, not the configured interface belongs to the master instance instead of its customer vrf. This incident is better attributed to the customer-facing logical interface was not bound to the intended routing instance.

Question 616

A company uses multiple VPN routing instances on one PE. Observed: The configured interface belongs to the master instance instead of its customer VRF. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  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 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.
  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

C:

The control is specific to the initial failure. It requires the result Customer ARP and route exchange occur only inside its authorized VRF. and treats The configured interface belongs to the master instance instead of its customer VRF. as a failure signal. The causal concern is the customer-facing logical interface was not bound to the intended routing instance.

Incorrect Answers

A:

It is valid for another service scenario but checks a customer subnet is absent on the far side while local sites exchange correctly. This case instead needs a gate for the configured interface belongs to the master instance instead of its customer vrf and evidence that customer ARP and route exchange occur only inside its authorized VRF.

B:

This gate monitors a different failure, customer multicast control signaling exists but payload delivery fails at a remote pe. It would not detect the current problem: The configured interface belongs to the master instance instead of its customer VRF. The appropriate check requires customer ARP and route exchange occur only inside its authorized VRF.

D:

The proposed control is tied to a route distinguisher provides nlri uniqueness, not import-policy membership, typically observed when operators expect the RD itself to enforce customer route isolation. Here the target is the customer-facing logical interface was not bound to the intended routing instance; monitor customer ARP and route exchange occur only inside its authorized VRF.

Question 617

A provider uses inter-AS VPN option A at a boundary. Observed: A customer subnet is absent on the far side while local sites exchange correctly. What should the routing engineer change first to address this particular symptom?

  1. Restore the contracted per-VRF border peering and scoped route filtering.
  2. Assign inet6 routes to the proper tenant instance and explicitly control exports.
  3. Configure the supported hierarchical labeled transport service end to end.
  4. Repair PE loopback IGP reachability and labeled transport to the remote PE.

Explanation

Correct Answer

A:

The decisive evidence is that A customer subnet is absent on the far side while local sites exchange correctly. This follows from the inter-as per-vrf ebgp exchange is missing a route export or prefix permission. The focused remedy is to restore the contracted per-VRF border peering and scoped route filtering. Confirm improvement when the authorized VPN subnet is learned across the AS boundary without tenant mixing. Validate on an approved lab or change window before touching production.

Incorrect Answers

B:

The option may be useful when iPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF, but that is not the current evidence. Here, a customer subnet is absent on the far side while local sites exchange correctly, indicating the inter-as per-vrf ebgp exchange is missing a route export or prefix permission. The targeted action is Restore the contracted per-VRF border peering and scoped route filtering.

C:

This change belongs to a different Layer 3 VPNs issue: An interprovider labeled packet cannot be forwarded through the upstream core. That issue involves the carrier-of-carriers design lacks compatible labeled route distribution and transport resolution. The current symptom is A customer subnet is absent on the far side while local sites exchange correctly. It instead requires restore the contracted per-VRF border peering and scoped route filtering.

D:

This remediates the vpn bgp next hop lacks a resolvable mpls labeled transport path, normally indicated by Remote PE imports the route but forwarding fails on the core transit. It would leave the observed problem (A customer subnet is absent on the far side while local sites exchange correctly) unresolved. Address it with restore the contracted per-VRF border peering and scoped route filtering.

Question 618

A provider uses inter-AS VPN option A at a boundary. Observed: A customer subnet is absent on the far side while local sites exchange correctly. Which acceptance observation best confirms that the proposed change worked?

  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. The downstream carrier can forward its labeled traffic across the upstream core.
  4. The authorized VPN subnet is learned across the AS boundary without tenant mixing.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was A customer subnet is absent on the far side while local sites exchange correctly. The correction addresses the inter-as per-vrf ebgp exchange is missing a route export or prefix permission; success requires the authorized VPN subnet is learned across the AS boundary without tenant mixing.

Incorrect Answers

A:

This result is useful in another case with evidence Remote PE imports the route but forwarding fails on the core transit. It does not test recovery from a customer subnet is absent on the far side while local sites exchange correctly. Check instead whether the authorized VPN subnet is learned across the AS boundary without tenant mixing.

B:

That observation would verify a separate fault involving the customer interface or routing family is associated with the wrong routing instance. Its symptom is IPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. For this case the actual issue is the inter-as per-vrf ebgp exchange is missing a route export or prefix permission, and the relevant success signal is The authorized VPN subnet is learned across the AS boundary without tenant mixing.

C:

It confirms an unrelated service correction: The carrier-of-carriers design lacks compatible labeled route distribution and transport resolution. The present case reports A customer subnet is absent on the far side while local sites exchange correctly. Its completion test is The authorized VPN subnet is learned across the AS boundary without tenant mixing.

Question 619

A provider uses inter-AS VPN option A at a boundary. Observed: A customer subnet is absent on the far side while local sites exchange correctly. What is the most likely source of the observed routing or service failure?

  1. The customer interface or routing family is associated with the wrong routing instance.
  2. The carrier-of-carriers design lacks compatible labeled route distribution and transport resolution.
  3. The VPN BGP next hop lacks a resolvable MPLS labeled transport path.
  4. The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: A customer subnet is absent on the far side while local sites exchange correctly. The specified root issue is The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission. Repair it through restore the contracted per-VRF border peering and scoped route filtering, then check the authorized VPN subnet is learned across the AS boundary without tenant mixing.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains ipv6 routes leak into the global ipv6 table instead of the tenant's inet6 vrf, not a customer subnet is absent on the far side while local sites exchange correctly. This incident is better attributed to the inter-as per-vrf ebgp exchange is missing a route export or prefix permission.

B:

The carrier-of-carriers design lacks compatible labeled route distribution and transport resolution. would normally be accompanied by an interprovider labeled packet cannot be forwarded through the upstream core. The observed symptom is different: A customer subnet is absent on the far side while local sites exchange correctly. The likely cause is The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission.

C:

That explanation fits another condition: Remote PE imports the route but forwarding fails on the core transit. The evidence here is A customer subnet is absent on the far side while local sites exchange correctly. Its closer root cause is The inter-AS per-VRF eBGP exchange is missing a route export or prefix permission.

Question 620

A provider uses inter-AS VPN option A at a boundary. Observed: A customer subnet is absent on the far side while local sites exchange correctly. What operational check best guards against this problem returning?

  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 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 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 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

D:

This control asks for the same recovery evidence (The authorized VPN subnet is learned across the AS boundary without tenant mixing) and flags recurrence of the same failure (A customer subnet is absent on the far side while local sites exchange correctly). It targets the underlying issue, the inter-as per-vrf ebgp exchange is missing a route export or prefix permission, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to the customer interface or routing family is associated with the wrong routing instance, typically observed when iPv6 routes leak into the global IPv6 table instead of the tenant's inet6 VRF. Here the target is the inter-as per-vrf ebgp exchange is missing a route export or prefix permission; monitor the authorized VPN subnet is learned across the AS boundary without tenant mixing.

B:

It is valid for another service scenario but checks remote pe imports the route but forwarding fails on the core transit. This case instead needs a gate for a customer subnet is absent on the far side while local sites exchange correctly and evidence that the authorized VPN subnet is learned across the AS boundary without tenant mixing.

C:

This gate monitors a different failure, an interprovider labeled packet cannot be forwarded through the upstream core. It would not detect the current problem: A customer subnet is absent on the far side while local sites exchange correctly. The appropriate check requires the authorized VPN subnet is learned across the AS boundary without tenant mixing.

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