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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 34

Question 330

An edge BGP peer accepts IPv4 unicast but not a VPN address family. Observed: Route-monitor output shows no VPNv4 capabilities agreed. Which acceptance observation best confirms that the proposed change worked?

  1. Unauthorized leaked prefixes are rejected while legitimate transit announcements remain.
  2. The VPN prefix resolves to a valid provider transport path.
  3. All intended iBGP speakers receive the eligible reflected NLRI.
  4. VPNv4 prefixes and their route targets appear at authorized receivers.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was Route-monitor output shows no VPNv4 capabilities agreed. The correction addresses multiprotocol capabilities are not negotiated consistently; success requires vPNv4 prefixes and their route targets appear at authorized receivers.

Incorrect Answers

A:

This result is useful in another case with evidence Thousands of leaked more-specific prefixes are accepted without validation. It does not test recovery from route-monitor output shows no vpnv4 capabilities agreed. Check instead whether vPNv4 prefixes and their route targets appear at authorized receivers.

B:

It confirms an unrelated service correction: PE loopback reachability is missing from the transport IGP. The present case reports Route-monitor output shows no VPNv4 capabilities agreed. Its completion test is VPNv4 prefixes and their route targets appear at authorized receivers.

C:

That observation would verify a separate fault involving route reflection only propagates paths according to client and nonclient advertisement rules. Its symptom is Some nonclient speakers still cannot learn routes from other nonclients. For this case the actual issue is multiprotocol capabilities are not negotiated consistently, and the relevant success signal is VPNv4 prefixes and their route targets appear at authorized receivers.

Question 331

An edge BGP peer accepts IPv4 unicast but not a VPN address family. Observed: Route-monitor output shows no VPNv4 capabilities agreed. What is the most likely source of the observed routing or service failure?

  1. PE loopback reachability is missing from the transport IGP.
  2. Import policy lacks authorized prefix and route-origin controls.
  3. Route reflection only propagates paths according to client and nonclient advertisement rules.
  4. Multiprotocol capabilities are not negotiated consistently.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: Route-monitor output shows no VPNv4 capabilities agreed. The specified root issue is Multiprotocol capabilities are not negotiated consistently. Repair it through configure the intended MP-BGP family between valid PE and reflector peers, then check vPNv4 prefixes and their route targets appear at authorized receivers.

Incorrect Answers

A:

PE loopback reachability is missing from the transport IGP. would normally be accompanied by one site receives the route with a next hop it cannot resolve. The observed symptom is different: Route-monitor output shows no VPNv4 capabilities agreed. The likely cause is Multiprotocol capabilities are not negotiated consistently.

B:

That explanation fits another condition: Thousands of leaked more-specific prefixes are accepted without validation. The evidence here is Route-monitor output shows no VPNv4 capabilities agreed. Its closer root cause is Multiprotocol capabilities are not negotiated consistently.

C:

The stated cause is possible elsewhere but explains some nonclient speakers still cannot learn routes from other nonclients, not route-monitor output shows no vpnv4 capabilities agreed. This incident is better attributed to multiprotocol capabilities are not negotiated consistently.

Question 332

An edge BGP peer accepts IPv4 unicast but not a VPN address family. Observed: Route-monitor output shows no VPNv4 capabilities agreed. What operational check best guards against this problem returning?

  1. For each approved related change, verify that vPNv4 prefixes and their route targets appear at authorized receivers. Flag recurrence if route-monitor output shows no VPNv4 capabilities agreed.
  2. For each approved related change, verify that all intended iBGP speakers receive the eligible reflected NLRI. Flag recurrence if some nonclient speakers still cannot learn routes from other nonclients.
  3. For each approved related change, verify that the VPN prefix resolves to a valid provider transport path. Flag recurrence if one site receives the route with a next hop it cannot resolve.
  4. For each approved related change, verify that unauthorized leaked prefixes are rejected while legitimate transit announcements remain. Flag recurrence if thousands of leaked more-specific prefixes are accepted without validation.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (VPNv4 prefixes and their route targets appear at authorized receivers) and flags recurrence of the same failure (Route-monitor output shows no VPNv4 capabilities agreed). It targets the underlying issue, multiprotocol capabilities are not negotiated consistently, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

The proposed control is tied to route reflection only propagates paths according to client and nonclient advertisement rules, typically observed when some nonclient speakers still cannot learn routes from other nonclients. Here the target is multiprotocol capabilities are not negotiated consistently; monitor vPNv4 prefixes and their route targets appear at authorized receivers.

C:

This gate monitors a different failure, one site receives the route with a next hop it cannot resolve. It would not detect the current problem: Route-monitor output shows no VPNv4 capabilities agreed. The appropriate check requires vPNv4 prefixes and their route targets appear at authorized receivers.

D:

It is valid for another service scenario but checks thousands of leaked more-specific prefixes are accepted without validation. This case instead needs a gate for route-monitor output shows no vpnv4 capabilities agreed and evidence that vPNv4 prefixes and their route targets appear at authorized receivers.

Question 333

A route reflector forwards two copies of a VPN prefix from different clients. Observed: One site receives the route with a next hop it cannot resolve. Which targeted remediation is most appropriate for the observed condition?

  1. Establish a coherent route-reflector cluster identity policy.
  2. Check four-octet capability negotiation and parse AS4 attributes correctly.
  3. Restore PE loopback transport visibility without leaking tenant routes into the core.
  4. Set a reachable eBGP next hop under the permitted export policy.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—One site receives the route with a next hop it cannot resolve—is consistent with pe loopback reachability is missing from the transport igp. Use the specified correction, then verify: The VPN prefix resolves to a valid provider transport path. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This remediates an inconsistent cluster-id configuration creates route-loop prevention mismatches, normally indicated by Clients sporadically reject an otherwise reachable reflected route. It would leave the observed problem (One site receives the route with a next hop it cannot resolve) unresolved. Address it with restore PE loopback transport visibility without leaking tenant routes into the core.

B:

The option may be useful when a monitoring system reports AS_TRANS unexpectedly in the legacy view, but that is not the current evidence. Here, one site receives the route with a next hop it cannot resolve, indicating pe loopback reachability is missing from the transport igp. The targeted action is Restore PE loopback transport visibility without leaking tenant routes into the core.

D:

This change belongs to a different BGP issue: The route appears locally but its next-hop address fails the remote peer's reachability checks. That issue involves the exported next-hop attribute is inappropriate for the external path. The current symptom is One site receives the route with a next hop it cannot resolve. It instead requires restore PE loopback transport visibility without leaking tenant routes into the core.

Question 334

A route reflector forwards two copies of a VPN prefix from different clients. Observed: One site receives the route with a next hop it cannot resolve. What evidence would validate recovery from this precise failure mode?

  1. Reflected routes carry valid originator and cluster attributes without incorrect rejection.
  2. The VPN prefix resolves to a valid provider transport path.
  3. Remote neighbor installs and forwards through the authorized next hop.
  4. Both peers display the intended full AS numbers and routes retain valid AS paths.

Explanation

Correct Answer

B:

The intended result is The VPN prefix resolves to a valid provider transport path. It specifically verifies recovery from pe loopback reachability is missing from the transport igp, which produced the original symptom: One site receives the route with a next hop it cannot resolve. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence Clients sporadically reject an otherwise reachable reflected route. It does not test recovery from one site receives the route with a next hop it cannot resolve. Check instead whether the VPN prefix resolves to a valid provider transport path.

C:

It confirms an unrelated service correction: The exported next-hop attribute is inappropriate for the external path. The present case reports One site receives the route with a next hop it cannot resolve. Its completion test is The VPN prefix resolves to a valid provider transport path.

D:

That observation would verify a separate fault involving four-octet as capability handling is being read as an actual unexpected transit asn. Its symptom is A monitoring system reports AS_TRANS unexpectedly in the legacy view. For this case the actual issue is pe loopback reachability is missing from the transport igp, and the relevant success signal is The VPN prefix resolves to a valid provider transport path.

Question 335

A route reflector forwards two copies of a VPN prefix from different clients. Observed: One site receives the route with a next hop it cannot resolve. What underlying protocol or service configuration problem best explains the evidence?

  1. The exported next-hop attribute is inappropriate for the external path.
  2. PE loopback reachability is missing from the transport IGP.
  3. An inconsistent cluster-ID configuration creates route-loop prevention mismatches.
  4. Four-octet AS capability handling is being read as an actual unexpected transit ASN.

Explanation

Correct Answer

B:

Because one site receives the route with a next hop it cannot resolve, the likely cause is pe loopback reachability is missing from the transport igp. It is testable: Restore PE loopback transport visibility without leaking tenant routes into the core. Expected follow-up: The VPN prefix resolves to a valid provider transport path.

Incorrect Answers

A:

The exported next-hop attribute is inappropriate for the external path. would normally be accompanied by the route appears locally but its next-hop address fails the remote peer's reachability checks. The observed symptom is different: One site receives the route with a next hop it cannot resolve. The likely cause is PE loopback reachability is missing from the transport IGP.

C:

That explanation fits another condition: Clients sporadically reject an otherwise reachable reflected route. The evidence here is One site receives the route with a next hop it cannot resolve. Its closer root cause is PE loopback reachability is missing from the transport IGP.

D:

The stated cause is possible elsewhere but explains a monitoring system reports as_trans unexpectedly in the legacy view, not one site receives the route with a next hop it cannot resolve. This incident is better attributed to pe loopback reachability is missing from the transport igp.

Question 336

A route reflector forwards two copies of a VPN prefix from different clients. Observed: One site receives the route with a next hop it cannot resolve. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that the VPN prefix resolves to a valid provider transport path. Flag recurrence if one site receives the route with a next hop it cannot resolve.
  2. For each approved related change, verify that reflected routes carry valid originator and cluster attributes without incorrect rejection. Flag recurrence if clients sporadically reject an otherwise reachable reflected route.
  3. For each approved related change, verify that both peers display the intended full AS numbers and routes retain valid AS paths. Flag recurrence if a monitoring system reports AS_TRANS unexpectedly in the legacy view.
  4. For each approved related change, verify that remote neighbor installs and forwards through the authorized next hop. Flag recurrence if the route appears locally but its next-hop address fails the remote peer's reachability checks.

Explanation

Correct Answer

A:

A useful regression gate tests whether the VPN prefix resolves to a valid provider transport path and alerts when one site receives the route with a next hop it cannot resolve. This directly checks the technical weakness: PE loopback reachability is missing from the transport IGP. 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 clients sporadically reject an otherwise reachable reflected route. This case instead needs a gate for one site receives the route with a next hop it cannot resolve and evidence that the VPN prefix resolves to a valid provider transport path.

C:

The proposed control is tied to four-octet as capability handling is being read as an actual unexpected transit asn, typically observed when a monitoring system reports AS_TRANS unexpectedly in the legacy view. Here the target is pe loopback reachability is missing from the transport igp; monitor the VPN prefix resolves to a valid provider transport path.

D:

This gate monitors a different failure, the route appears locally but its next-hop address fails the remote peer's reachability checks. It would not detect the current problem: One site receives the route with a next hop it cannot resolve. The appropriate check requires the VPN prefix resolves to a valid provider transport path.

Question 337

Two neighboring eBGP routers have a mixed 16-bit and 32-bit AS numbering design. Observed: A monitoring system reports AS_TRANS unexpectedly in the legacy view. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Repair IGP reachability or apply an appropriate next-hop-self policy at the ingress border.
  2. Correct scoped policy ordering and community match before route installation.
  3. Design appropriate secondary route visibility or add-path where supported.
  4. Check four-octet capability negotiation and parse AS4 attributes correctly.

Explanation

Correct Answer

D:

The observed condition is A monitoring system reports AS_TRANS unexpectedly in the legacy view. That indicates four-octet as capability handling is being read as an actual unexpected transit asn. Applying the proposed remedy directly changes that condition. A concrete completion check is: Both peers display the intended full AS numbers and routes retain valid AS paths.

Incorrect Answers

A:

This change belongs to a different BGP issue: Peers see the advertised prefix but cannot install it in their RIBs. That issue involves the advertised bgp next hop is unreachable in the underlay. The current symptom is A monitoring system reports AS_TRANS unexpectedly in the legacy view. It instead requires check four-octet capability negotiation and parse AS4 attributes correctly.

B:

This remediates the policy term matches community yet assigns an unintended routing-instance action, normally indicated by A route arrives with the right community but enters the wrong routing instance. It would leave the observed problem (A monitoring system reports AS_TRANS unexpectedly in the legacy view) unresolved. Address it with check four-octet capability negotiation and parse AS4 attributes correctly.

C:

The option may be useful when another iBGP router receives the path but loses it when the originating client flaps, but that is not the current evidence. Here, a monitoring system reports AS_TRANS unexpectedly in the legacy view, indicating four-octet as capability handling is being read as an actual unexpected transit asn. The targeted action is Check four-octet capability negotiation and parse AS4 attributes correctly.

Question 338

Two neighboring eBGP routers have a mixed 16-bit and 32-bit AS numbering design. Observed: A monitoring system reports AS_TRANS unexpectedly in the legacy view. After the correction, which result would most convincingly show that this fault is resolved?

  1. The permitted tagged route enters only the intended instance.
  2. A valid alternate becomes available during controlled primary route withdrawal.
  3. Both peers display the intended full AS numbers and routes retain valid AS paths.
  4. The prefix becomes active with a resolvable BGP next hop.

Explanation

Correct Answer

C:

After check four-octet capability negotiation and parse AS4 attributes correctly, inspect whether both peers display the intended full AS numbers and routes retain valid AS paths. This closes the loop between the reported observation (A monitoring system reports AS_TRANS unexpectedly in the legacy view) and the underlying issue (Four-octet AS capability handling is being read as an actual unexpected transit ASN).

Incorrect Answers

A:

This result is useful in another case with evidence A route arrives with the right community but enters the wrong routing instance. It does not test recovery from a monitoring system reports as_trans unexpectedly in the legacy view. Check instead whether both peers display the intended full AS numbers and routes retain valid AS paths.

B:

That observation would verify a separate fault involving the reflector has no alternate path because add-path or path-diversity strategy is absent. Its symptom is Another iBGP router receives the path but loses it when the originating client flaps. For this case the actual issue is four-octet as capability handling is being read as an actual unexpected transit asn, and the relevant success signal is Both peers display the intended full AS numbers and routes retain valid AS paths.

D:

It confirms an unrelated service correction: The advertised BGP next hop is unreachable in the underlay. The present case reports A monitoring system reports AS_TRANS unexpectedly in the legacy view. Its completion test is Both peers display the intended full AS numbers and routes retain valid AS paths.

Question 339

Two neighboring eBGP routers have a mixed 16-bit and 32-bit AS numbering design. Observed: A monitoring system reports AS_TRANS unexpectedly in the legacy view. Which root cause is most consistent with this symptom?

  1. The reflector has no alternate path because add-path or path-diversity strategy is absent.
  2. Four-octet AS capability handling is being read as an actual unexpected transit ASN.
  3. The policy term matches community yet assigns an unintended routing-instance action.
  4. The advertised BGP next hop is unreachable in the underlay.

Explanation

Correct Answer

B:

The reported evidence—A monitoring system reports AS_TRANS unexpectedly in the legacy view—supports four-octet as capability handling is being read as an actual unexpected transit asn. The appropriate intervention is to check four-octet capability negotiation and parse AS4 attributes correctly, with confirmation from both peers display the intended full AS numbers and routes retain valid AS paths. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains another ibgp router receives the path but loses it when the originating client flaps, not a monitoring system reports as_trans unexpectedly in the legacy view. This incident is better attributed to four-octet as capability handling is being read as an actual unexpected transit asn.

C:

That explanation fits another condition: A route arrives with the right community but enters the wrong routing instance. The evidence here is A monitoring system reports AS_TRANS unexpectedly in the legacy view. Its closer root cause is Four-octet AS capability handling is being read as an actual unexpected transit ASN.

D:

The advertised BGP next hop is unreachable in the underlay. would normally be accompanied by peers see the advertised prefix but cannot install it in their ribs. The observed symptom is different: A monitoring system reports AS_TRANS unexpectedly in the legacy view. The likely cause is Four-octet AS capability handling is being read as an actual unexpected transit ASN.

Question 340

Two neighboring eBGP routers have a mixed 16-bit and 32-bit AS numbering design. Observed: A monitoring system reports AS_TRANS unexpectedly in the legacy view. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that the prefix becomes active with a resolvable BGP next hop. Flag recurrence if peers see the advertised prefix but cannot install it in their RIBs.
  2. For each approved related change, verify that a valid alternate becomes available during controlled primary route withdrawal. Flag recurrence if another iBGP router receives the path but loses it when the originating client flaps.
  3. For each approved related change, verify that the permitted tagged route enters only the intended instance. Flag recurrence if a route arrives with the right community but enters the wrong routing instance.
  4. For each approved related change, verify that both peers display the intended full AS numbers and routes retain valid AS paths. Flag recurrence if a monitoring system reports AS_TRANS unexpectedly in the legacy view.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Both peers display the intended full AS numbers and routes retain valid AS paths. and treats A monitoring system reports AS_TRANS unexpectedly in the legacy view. as a failure signal. The causal concern is four-octet as capability handling is being read as an actual unexpected transit asn.

Incorrect Answers

A:

This gate monitors a different failure, peers see the advertised prefix but cannot install it in their ribs. It would not detect the current problem: A monitoring system reports AS_TRANS unexpectedly in the legacy view. The appropriate check requires both peers display the intended full AS numbers and routes retain valid AS paths.

B:

The proposed control is tied to the reflector has no alternate path because add-path or path-diversity strategy is absent, typically observed when another iBGP router receives the path but loses it when the originating client flaps. Here the target is four-octet as capability handling is being read as an actual unexpected transit asn; monitor both peers display the intended full AS numbers and routes retain valid AS paths.

C:

It is valid for another service scenario but checks a route arrives with the right community but enters the wrong routing instance. This case instead needs a gate for a monitoring system reports as_trans unexpectedly in the legacy view and evidence that both peers display the intended full AS numbers and routes retain valid AS paths.

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