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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 74

Question 730

A service provider uses BGP VPLS signaling for a four-site customer. Observed: One site never joins the full mesh despite a healthy BGP session. What evidence would validate recovery from this precise failure mode?

  1. MAC movement events settle and forwarding points to the legitimate attachment.
  2. MAC stability returns and failover works without a storm.
  3. All intended remote PEs build their customer VPLS peer connections.
  4. The L2 circuit becomes Up and customer frames traverse the pseudowire.

Explanation

Correct Answer

C:

The intended result is All intended remote PEs build their customer VPLS peer connections. It specifically verifies recovery from the site's vpls nlri or rt export settings are incomplete, which produced the original symptom: One site never joins the full mesh despite a healthy BGP session. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence The same customer MAC repeatedly moves without a real host migration. It does not test recovery from one site never joins the full mesh despite a healthy bgp session. Check instead whether all intended remote PEs build their customer VPLS peer connections.

B:

That observation would verify a separate fault involving active pseudowires violate the intended loop-prevention or multihoming design. Its symptom is MAC movement and broadcast storms appear after both CE ports activate. For this case the actual issue is the site's vpls nlri or rt export settings are incomplete, and the relevant success signal is All intended remote PEs build their customer VPLS peer connections.

D:

It confirms an unrelated service correction: The local and remote virtual circuit identifiers do not match. The present case reports One site never joins the full mesh despite a healthy BGP session. Its completion test is All intended remote PEs build their customer VPLS peer connections.

Question 731

A service provider uses BGP VPLS signaling for a four-site customer. Observed: One site never joins the full mesh despite a healthy BGP session. What underlying protocol or service configuration problem best explains the evidence?

  1. Active pseudowires violate the intended loop-prevention or multihoming design.
  2. The local and remote virtual circuit identifiers do not match.
  3. Duplicate MAC origin or loop in the underlying customer Ethernet segment.
  4. The site's VPLS NLRI or RT export settings are incomplete.

Explanation

Correct Answer

D:

Because one site never joins the full mesh despite a healthy BGP session, the likely cause is the site's vpls nlri or rt export settings are incomplete. It is testable: Advertise the correct VPLS membership information and import targets. Expected follow-up: All intended remote PEs build their customer VPLS peer connections.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains mac movement and broadcast storms appear after both ce ports activate, not one site never joins the full mesh despite a healthy bgp session. This incident is better attributed to the site's vpls nlri or rt export settings are incomplete.

B:

The local and remote virtual circuit identifiers do not match. would normally be accompanied by one endpoint reports a matching neighbor but pseudowire status stays down. The observed symptom is different: One site never joins the full mesh despite a healthy BGP session. The likely cause is The site's VPLS NLRI or RT export settings are incomplete.

C:

That explanation fits another condition: The same customer MAC repeatedly moves without a real host migration. The evidence here is One site never joins the full mesh despite a healthy BGP session. Its closer root cause is The site's VPLS NLRI or RT export settings are incomplete.

Question 732

A service provider uses BGP VPLS signaling for a four-site customer. Observed: One site never joins the full mesh despite a healthy BGP session. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that mAC movement events settle and forwarding points to the legitimate attachment. Flag recurrence if the same customer MAC repeatedly moves without a real host migration.
  2. For each approved related change, verify that all intended remote PEs build their customer VPLS peer connections. Flag recurrence if one site never joins the full mesh despite a healthy BGP session.
  3. For each approved related change, verify that mAC stability returns and failover works without a storm. Flag recurrence if mAC movement and broadcast storms appear after both CE ports activate.
  4. For each approved related change, verify that the L2 circuit becomes Up and customer frames traverse the pseudowire. Flag recurrence if one endpoint reports a matching neighbor but pseudowire status stays Down.

Explanation

Correct Answer

B:

A useful regression gate tests whether all intended remote PEs build their customer VPLS peer connections and alerts when one site never joins the full mesh despite a healthy BGP session. This directly checks the technical weakness: The site's VPLS NLRI or RT export settings are incomplete. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

It is valid for another service scenario but checks the same customer mac repeatedly moves without a real host migration. This case instead needs a gate for one site never joins the full mesh despite a healthy bgp session and evidence that all intended remote PEs build their customer VPLS peer connections.

C:

The proposed control is tied to active pseudowires violate the intended loop-prevention or multihoming design, typically observed when mAC movement and broadcast storms appear after both CE ports activate. Here the target is the site's vpls nlri or rt export settings are incomplete; monitor all intended remote PEs build their customer VPLS peer connections.

D:

This gate monitors a different failure, one endpoint reports a matching neighbor but pseudowire status stays down. It would not detect the current problem: One site never joins the full mesh despite a healthy BGP session. The appropriate check requires all intended remote PEs build their customer VPLS peer connections.

Question 733

A provider VPLS creates accidental Layer 2 loops when a CE dual-homes to two sites. Observed: MAC movement and broadcast storms appear after both CE ports activate. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Remove unjustified payload filtering and use proper Ethernet-transparent pseudowire mapping.
  2. Align service MTU and encapsulation overhead across both pseudowire ends.
  3. Establish required LDP VPLS signaling and service identifiers.
  4. Implement supported VPLS multihoming and loop-control behavior.

Explanation

Correct Answer

D:

The observed condition is MAC movement and broadcast storms appear after both CE ports activate. That indicates active pseudowires violate the intended loop-prevention or multihoming design. Applying the proposed remedy directly changes that condition. A concrete completion check is: MAC stability returns and failover works without a storm.

Incorrect Answers

A:

This change belongs to a different Layer 2 VPNs issue: IPv6 frames fail while ordinary IPv4 packets cross the same circuit. That issue involves the service has an inappropriate ethertype filter or nontransparent encapsulation. The current symptom is MAC movement and broadcast storms appear after both CE ports activate. It instead requires implement supported VPLS multihoming and loop-control behavior.

B:

The option may be useful when traffic passes small frames but larger customer packets are discarded, but that is not the current evidence. Here, mAC movement and broadcast storms appear after both CE ports activate, indicating active pseudowires violate the intended loop-prevention or multihoming design. The targeted action is Implement supported VPLS multihoming and loop-control behavior.

C:

This remediates vpls signaling or targeted ldp sessions are missing between pes, normally indicated by A PE cannot find the other site's pseudowire although the underlay path is healthy. It would leave the observed problem (MAC movement and broadcast storms appear after both CE ports activate) unresolved. Address it with implement supported VPLS multihoming and loop-control behavior.

Question 734

A provider VPLS creates accidental Layer 2 loops when a CE dual-homes to two sites. Observed: MAC movement and broadcast storms appear after both CE ports activate. After the correction, which result would most convincingly show that this fault is resolved?

  1. Large authorized frames pass without fragmentation-induced drops.
  2. All VPLS members exchange signaling and form the expected forwarding topology.
  3. Both IPv4 and IPv6 EtherTypes cross according to the customer contract.
  4. MAC stability returns and failover works without a storm.

Explanation

Correct Answer

D:

After implement supported VPLS multihoming and loop-control behavior, inspect whether mAC stability returns and failover works without a storm. This closes the loop between the reported observation (MAC movement and broadcast storms appear after both CE ports activate) and the underlying issue (Active pseudowires violate the intended loop-prevention or multihoming design).

Incorrect Answers

A:

That observation would verify a separate fault involving the attachment circuit and pseudowire do not share a compatible effective mtu. Its symptom is Traffic passes small frames but larger customer packets are discarded. For this case the actual issue is active pseudowires violate the intended loop-prevention or multihoming design, and the relevant success signal is MAC stability returns and failover works without a storm.

B:

This result is useful in another case with evidence A PE cannot find the other site's pseudowire although the underlay path is healthy. It does not test recovery from mac movement and broadcast storms appear after both ce ports activate. Check instead whether mAC stability returns and failover works without a storm.

C:

It confirms an unrelated service correction: The service has an inappropriate ethertype filter or nontransparent encapsulation. The present case reports MAC movement and broadcast storms appear after both CE ports activate. Its completion test is MAC stability returns and failover works without a storm.

Question 735

A provider VPLS creates accidental Layer 2 loops when a CE dual-homes to two sites. Observed: MAC movement and broadcast storms appear after both CE ports activate. Which root cause is most consistent with this symptom?

  1. Active pseudowires violate the intended loop-prevention or multihoming design.
  2. The attachment circuit and pseudowire do not share a compatible effective MTU.
  3. The service has an inappropriate ethertype filter or nontransparent encapsulation.
  4. VPLS signaling or targeted LDP sessions are missing between PEs.

Explanation

Correct Answer

A:

The reported evidence—MAC movement and broadcast storms appear after both CE ports activate—supports active pseudowires violate the intended loop-prevention or multihoming design. The appropriate intervention is to implement supported VPLS multihoming and loop-control behavior, with confirmation from mAC stability returns and failover works without a storm. Other causes require actual device-state verification.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains traffic passes small frames but larger customer packets are discarded, not mac movement and broadcast storms appear after both ce ports activate. This incident is better attributed to active pseudowires violate the intended loop-prevention or multihoming design.

C:

The service has an inappropriate ethertype filter or nontransparent encapsulation. would normally be accompanied by ipv6 frames fail while ordinary ipv4 packets cross the same circuit. The observed symptom is different: MAC movement and broadcast storms appear after both CE ports activate. The likely cause is Active pseudowires violate the intended loop-prevention or multihoming design.

D:

That explanation fits another condition: A PE cannot find the other site's pseudowire although the underlay path is healthy. The evidence here is MAC movement and broadcast storms appear after both CE ports activate. Its closer root cause is Active pseudowires violate the intended loop-prevention or multihoming design.

Question 736

A provider VPLS creates accidental Layer 2 loops when a CE dual-homes to two sites. Observed: MAC movement and broadcast storms appear after both CE ports activate. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that mAC stability returns and failover works without a storm. Flag recurrence if mAC movement and broadcast storms appear after both CE ports activate.
  2. For each approved related change, verify that large authorized frames pass without fragmentation-induced drops. Flag recurrence if traffic passes small frames but larger customer packets are discarded.
  3. For each approved related change, verify that all VPLS members exchange signaling and form the expected forwarding topology. Flag recurrence if a PE cannot find the other site's pseudowire although the underlay path is healthy.
  4. For each approved related change, verify that both IPv4 and IPv6 EtherTypes cross according to the customer contract. Flag recurrence if iPv6 frames fail while ordinary IPv4 packets cross the same circuit.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result MAC stability returns and failover works without a storm. and treats MAC movement and broadcast storms appear after both CE ports activate. as a failure signal. The causal concern is active pseudowires violate the intended loop-prevention or multihoming design.

Incorrect Answers

B:

The proposed control is tied to the attachment circuit and pseudowire do not share a compatible effective mtu, typically observed when traffic passes small frames but larger customer packets are discarded. Here the target is active pseudowires violate the intended loop-prevention or multihoming design; monitor mAC stability returns and failover works without a storm.

C:

It is valid for another service scenario but checks a pe cannot find the other site's pseudowire although the underlay path is healthy. This case instead needs a gate for mac movement and broadcast storms appear after both ce ports activate and evidence that mAC stability returns and failover works without a storm.

D:

This gate monitors a different failure, ipv6 frames fail while ordinary ipv4 packets cross the same circuit. It would not detect the current problem: MAC movement and broadcast storms appear after both CE ports activate. The appropriate check requires mAC stability returns and failover works without a storm.

Question 737

An LDP VPLS service connects regional video studios. Observed: A PE cannot find the other site's pseudowire although the underlay path is healthy. What should the routing engineer change first to address this particular symptom?

  1. Match tagged or untagged service encapsulation on both attachment circuits.
  2. Apply supported VPLS storm control and consider a scalable EVPN design.
  3. Establish required LDP VPLS signaling and service identifiers.
  4. Align stacked VLAN handling and supported pseudowire encapsulation at both PEs.

Explanation

Correct Answer

C:

The decisive evidence is that A PE cannot find the other site's pseudowire although the underlay path is healthy. This follows from vpls signaling or targeted ldp sessions are missing between pes. The focused remedy is to establish required LDP VPLS signaling and service identifiers. Confirm improvement when all VPLS members exchange signaling and form the expected forwarding topology. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates vlan tagging and pseudowire encapsulation semantics differ at the endpoints, normally indicated by Customer tags disappear at the remote CE port. It would leave the observed problem (A PE cannot find the other site's pseudowire although the underlay path is healthy) unresolved. Address it with establish required LDP VPLS signaling and service identifiers.

B:

This change belongs to a different Layer 2 VPNs issue: Broadcast and unknown-unicast replication overloads the service. That issue involves flooding and mac learning behavior were not accounted for as the broadcast domain grew. The current symptom is A PE cannot find the other site's pseudowire although the underlay path is healthy. It instead requires establish required LDP VPLS signaling and service identifiers.

D:

The option may be useful when only the outer service VLAN survives and nested customer tags are lost, but that is not the current evidence. Here, a PE cannot find the other site's pseudowire although the underlay path is healthy, indicating vpls signaling or targeted ldp sessions are missing between pes. The targeted action is Establish required LDP VPLS signaling and service identifiers.

Question 738

An LDP VPLS service connects regional video studios. Observed: A PE cannot find the other site's pseudowire although the underlay path is healthy. Which acceptance observation best confirms that the proposed change worked?

  1. Broadcast utilization drops while essential MAC discovery and traffic still work.
  2. Remote captures preserve the contracted customer VLAN header.
  3. All VPLS members exchange signaling and form the expected forwarding topology.
  4. Captures at both sites show identical intended inner and outer tag structure.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was A PE cannot find the other site's pseudowire although the underlay path is healthy. The correction addresses vpls signaling or targeted ldp sessions are missing between pes; success requires all VPLS members exchange signaling and form the expected forwarding topology.

Incorrect Answers

A:

It confirms an unrelated service correction: Flooding and MAC learning behavior were not accounted for as the broadcast domain grew. The present case reports A PE cannot find the other site's pseudowire although the underlay path is healthy. Its completion test is All VPLS members exchange signaling and form the expected forwarding topology.

B:

This result is useful in another case with evidence Customer tags disappear at the remote CE port. It does not test recovery from a pe cannot find the other site's pseudowire although the underlay path is healthy. Check instead whether all VPLS members exchange signaling and form the expected forwarding topology.

D:

That observation would verify a separate fault involving qinq tag handling differs between ingress and remote attachment circuits. Its symptom is Only the outer service VLAN survives and nested customer tags are lost. For this case the actual issue is vpls signaling or targeted ldp sessions are missing between pes, and the relevant success signal is All VPLS members exchange signaling and form the expected forwarding topology.

Question 739

An LDP VPLS service connects regional video studios. Observed: A PE cannot find the other site's pseudowire although the underlay path is healthy. What is the most likely source of the observed routing or service failure?

  1. VLAN tagging and pseudowire encapsulation semantics differ at the endpoints.
  2. QinQ tag handling differs between ingress and remote attachment circuits.
  3. Flooding and MAC learning behavior were not accounted for as the broadcast domain grew.
  4. VPLS signaling or targeted LDP sessions are missing between PEs.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: A PE cannot find the other site's pseudowire although the underlay path is healthy. The specified root issue is VPLS signaling or targeted LDP sessions are missing between PEs. Repair it through establish required LDP VPLS signaling and service identifiers, then check all VPLS members exchange signaling and form the expected forwarding topology.

Incorrect Answers

A:

That explanation fits another condition: Customer tags disappear at the remote CE port. The evidence here is A PE cannot find the other site's pseudowire although the underlay path is healthy. Its closer root cause is VPLS signaling or targeted LDP sessions are missing between PEs.

B:

The stated cause is possible elsewhere but explains only the outer service vlan survives and nested customer tags are lost, not a pe cannot find the other site's pseudowire although the underlay path is healthy. This incident is better attributed to vpls signaling or targeted ldp sessions are missing between pes.

C:

Flooding and MAC learning behavior were not accounted for as the broadcast domain grew. would normally be accompanied by broadcast and unknown-unicast replication overloads the service. The observed symptom is different: A PE cannot find the other site's pseudowire although the underlay path is healthy. The likely cause is VPLS signaling or targeted LDP sessions are missing between PEs.

Question 740

An LDP VPLS service connects regional video studios. Observed: A PE cannot find the other site's pseudowire although the underlay path is healthy. What operational check best guards against this problem returning?

  1. For each approved related change, verify that captures at both sites show identical intended inner and outer tag structure. Flag recurrence if only the outer service VLAN survives and nested customer tags are lost.
  2. For each approved related change, verify that broadcast utilization drops while essential MAC discovery and traffic still work. Flag recurrence if broadcast and unknown-unicast replication overloads the service.
  3. For each approved related change, verify that all VPLS members exchange signaling and form the expected forwarding topology. Flag recurrence if a PE cannot find the other site's pseudowire although the underlay path is healthy.
  4. For each approved related change, verify that remote captures preserve the contracted customer VLAN header. Flag recurrence if customer tags disappear at the remote CE port.

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (All VPLS members exchange signaling and form the expected forwarding topology) and flags recurrence of the same failure (A PE cannot find the other site's pseudowire although the underlay path is healthy). It targets the underlying issue, vpls signaling or targeted ldp sessions are missing between pes, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to qinq tag handling differs between ingress and remote attachment circuits, typically observed when only the outer service VLAN survives and nested customer tags are lost. Here the target is vpls signaling or targeted ldp sessions are missing between pes; monitor all VPLS members exchange signaling and form the expected forwarding topology.

B:

This gate monitors a different failure, broadcast and unknown-unicast replication overloads the service. It would not detect the current problem: A PE cannot find the other site's pseudowire although the underlay path is healthy. The appropriate check requires all VPLS members exchange signaling and form the expected forwarding topology.

D:

It is valid for another service scenario but checks customer tags disappear at the remote ce port. This case instead needs a gate for a pe cannot find the other site's pseudowire although the underlay path is healthy and evidence that all VPLS members exchange signaling and form the expected forwarding topology.

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