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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 73

Question 720

A BGP L2VPN service has duplicate site identifiers. Observed: Two attachments map to the same site ID and service endpoints conflict. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that authorized L2VPN NLRI reaches the spoke with intact RD and RT information. Flag recurrence if a new spoke receives no Layer 2 VPN membership information.
  2. For each approved related change, verify that the remote EVPN domain recognizes one common segment and converges on failover. Flag recurrence if each PE advertises a different ESI for the same physical Ethernet segment.
  3. For each approved related change, verify that the L2VPN forwarding map contains one consistent circuit per intended site. Flag recurrence if two attachments map to the same site ID and service endpoints conflict.
  4. For each approved related change, verify that each VLAN has the expected DF and BUM traffic follows one permitted path. Flag recurrence if a newly connected PE advertises the service but never forwards BUM frames when elected.

Explanation

Correct Answer

C:

A useful regression gate tests whether the L2VPN forwarding map contains one consistent circuit per intended site and alerts when two attachments map to the same site ID and service endpoints conflict. This directly checks the technical weakness: Site-ID uniqueness is not maintained across the pseudowire service. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

The proposed control is tied to the reflector does not negotiate the l2vpn address family for that client, typically observed when a new spoke receives no Layer 2 VPN membership information. Here the target is site-id uniqueness is not maintained across the pseudowire service; monitor the L2VPN forwarding map contains one consistent circuit per intended site.

B:

It is valid for another service scenario but checks each pe advertises a different esi for the same physical ethernet segment. This case instead needs a gate for two attachments map to the same site id and service endpoints conflict and evidence that the L2VPN forwarding map contains one consistent circuit per intended site.

D:

This gate monitors a different failure, a newly connected pe advertises the service but never forwards bum frames when elected. It would not detect the current problem: Two attachments map to the same site ID and service endpoints conflict. The appropriate check requires the L2VPN forwarding map contains one consistent circuit per intended site.

Question 721

An L2VPN route reflector is added to the provider backbone. Observed: A new spoke receives no Layer 2 VPN membership information. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Assign isolated RT import/export sets and check per-service forwarding instance.
  2. Restore proper EVPN Type-3 import and replication next-hop resolution.
  3. Enable compatible MP-BGP L2VPN family and reflection policy.
  4. Clear stale MAC state safely and update the active VPLS member circuits.

Explanation

Correct Answer

C:

The observed condition is A new spoke receives no Layer 2 VPN membership information. That indicates the reflector does not negotiate the l2vpn address family for that client. Applying the proposed remedy directly changes that condition. A concrete completion check is: Authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

Incorrect Answers

A:

The option may be useful when a transit PE imports endpoints from an unrelated L2VPN, but that is not the current evidence. Here, a new spoke receives no Layer 2 VPN membership information, indicating the reflector does not negotiate the l2vpn address family for that client. The targeted action is Enable compatible MP-BGP L2VPN family and reflection policy.

B:

This change belongs to a different Layer 2 VPNs issue: Broadcast and unknown-unicast traffic never reaches one remote PE. That issue involves the receiving pe lacks an eligible ingress-replication membership or tunnel mapping. The current symptom is A new spoke receives no Layer 2 VPN membership information. It instead requires enable compatible MP-BGP L2VPN family and reflection policy.

D:

This remediates the vpls service still contains stale forwarding database or pseudowire mapping, normally indicated by Customer MAC addresses appear on the wrong PE after a planned move. It would leave the observed problem (A new spoke receives no Layer 2 VPN membership information) unresolved. Address it with enable compatible MP-BGP L2VPN family and reflection policy.

Question 722

An L2VPN route reflector is added to the provider backbone. Observed: A new spoke receives no Layer 2 VPN membership information. After the correction, which result would most convincingly show that this fault is resolved?

  1. MAC learning associates each CE to the currently correct VPLS attachment.
  2. Every customer VPLS or circuit includes only its authorized sites.
  3. Authorized L2VPN NLRI reaches the spoke with intact RD and RT information.
  4. BUM traffic reaches each subscribed PE exactly as permitted.

Explanation

Correct Answer

C:

After enable compatible MP-BGP L2VPN family and reflection policy, inspect whether authorized L2VPN NLRI reaches the spoke with intact RD and RT information. This closes the loop between the reported observation (A new spoke receives no Layer 2 VPN membership information) and the underlying issue (The reflector does not negotiate the L2VPN address family for that client).

Incorrect Answers

A:

This result is useful in another case with evidence Customer MAC addresses appear on the wrong PE after a planned move. It does not test recovery from a new spoke receives no layer 2 vpn membership information. Check instead whether authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

B:

That observation would verify a separate fault involving l2vpn rt filters permit cross-service membership despite separate service definitions. Its symptom is A transit PE imports endpoints from an unrelated L2VPN. For this case the actual issue is the reflector does not negotiate the l2vpn address family for that client, and the relevant success signal is Authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

D:

It confirms an unrelated service correction: The receiving PE lacks an eligible ingress-replication membership or tunnel mapping. The present case reports A new spoke receives no Layer 2 VPN membership information. Its completion test is Authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

Question 723

An L2VPN route reflector is added to the provider backbone. Observed: A new spoke receives no Layer 2 VPN membership information. Which root cause is most consistent with this symptom?

  1. The receiving PE lacks an eligible ingress-replication membership or tunnel mapping.
  2. L2VPN RT filters permit cross-service membership despite separate service definitions.
  3. The reflector does not negotiate the L2VPN address family for that client.
  4. The VPLS service still contains stale forwarding database or pseudowire mapping.

Explanation

Correct Answer

C:

The reported evidence—A new spoke receives no Layer 2 VPN membership information—supports the reflector does not negotiate the l2vpn address family for that client. The appropriate intervention is to enable compatible MP-BGP L2VPN family and reflection policy, with confirmation from authorized L2VPN NLRI reaches the spoke with intact RD and RT information. Other causes require actual device-state verification.

Incorrect Answers

A:

The receiving PE lacks an eligible ingress-replication membership or tunnel mapping. would normally be accompanied by broadcast and unknown-unicast traffic never reaches one remote pe. The observed symptom is different: A new spoke receives no Layer 2 VPN membership information. The likely cause is The reflector does not negotiate the L2VPN address family for that client.

B:

The stated cause is possible elsewhere but explains a transit pe imports endpoints from an unrelated l2vpn, not a new spoke receives no layer 2 vpn membership information. This incident is better attributed to the reflector does not negotiate the l2vpn address family for that client.

D:

That explanation fits another condition: Customer MAC addresses appear on the wrong PE after a planned move. The evidence here is A new spoke receives no Layer 2 VPN membership information. Its closer root cause is The reflector does not negotiate the L2VPN address family for that client.

Question 724

An L2VPN route reflector is added to the provider backbone. Observed: A new spoke receives no Layer 2 VPN membership information. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that bUM traffic reaches each subscribed PE exactly as permitted. Flag recurrence if broadcast and unknown-unicast traffic never reaches one remote PE.
  2. For each approved related change, verify that mAC learning associates each CE to the currently correct VPLS attachment. Flag recurrence if customer MAC addresses appear on the wrong PE after a planned move.
  3. For each approved related change, verify that every customer VPLS or circuit includes only its authorized sites. Flag recurrence if a transit PE imports endpoints from an unrelated L2VPN.
  4. For each approved related change, verify that authorized L2VPN NLRI reaches the spoke with intact RD and RT information. Flag recurrence if a new spoke receives no Layer 2 VPN membership information.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Authorized L2VPN NLRI reaches the spoke with intact RD and RT information. and treats A new spoke receives no Layer 2 VPN membership information. as a failure signal. The causal concern is the reflector does not negotiate the l2vpn address family for that client.

Incorrect Answers

A:

This gate monitors a different failure, broadcast and unknown-unicast traffic never reaches one remote pe. It would not detect the current problem: A new spoke receives no Layer 2 VPN membership information. The appropriate check requires authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

B:

It is valid for another service scenario but checks customer mac addresses appear on the wrong pe after a planned move. This case instead needs a gate for a new spoke receives no layer 2 vpn membership information and evidence that authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

C:

The proposed control is tied to l2vpn rt filters permit cross-service membership despite separate service definitions, typically observed when a transit PE imports endpoints from an unrelated L2VPN. Here the target is the reflector does not negotiate the l2vpn address family for that client; monitor authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

Question 725

An operator migrates a VPLS service between PEs. Observed: Customer MAC addresses appear on the wrong PE after a planned move. What should the routing engineer change first to address this particular symptom?

  1. Apply the supported active/standby VPLS multihoming policy and test controlled switchover.
  2. Clear stale MAC state safely and update the active VPLS member circuits.
  3. Advertise the correct VPLS membership information and import targets.
  4. Configure supported all-active ES routes and aliasing behavior.

Explanation

Correct Answer

B:

The decisive evidence is that Customer MAC addresses appear on the wrong PE after a planned move. This follows from the vpls service still contains stale forwarding database or pseudowire mapping. The focused remedy is to clear stale MAC state safely and update the active VPLS member circuits. Confirm improvement when mAC learning associates each CE to the currently correct VPLS attachment. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates multihoming preference and standby pseudowire behavior were not reconciled, normally indicated by Service recovers briefly then oscillates when the second pseudowire activates. It would leave the observed problem (Customer MAC addresses appear on the wrong PE after a planned move) unresolved. Address it with clear stale MAC state safely and update the active VPLS member circuits.

C:

This change belongs to a different Layer 2 VPNs issue: One site never joins the full mesh despite a healthy BGP session. That issue involves the site's vpls nlri or rt export settings are incomplete. The current symptom is Customer MAC addresses appear on the wrong PE after a planned move. It instead requires clear stale MAC state safely and update the active VPLS member circuits.

D:

The option may be useful when both attachment PEs forward duplicate known unicast after migration, but that is not the current evidence. Here, customer MAC addresses appear on the wrong PE after a planned move, indicating the vpls service still contains stale forwarding database or pseudowire mapping. The targeted action is Clear stale MAC state safely and update the active VPLS member circuits.

Question 726

An operator migrates a VPLS service between PEs. Observed: Customer MAC addresses appear on the wrong PE after a planned move. Which acceptance observation best confirms that the proposed change worked?

  1. All intended remote PEs build their customer VPLS peer connections.
  2. One active attachment forwards at a time and backup takeover is stable.
  3. Known-unicast forwarding uses qualified paths without persistent duplicate frames.
  4. MAC learning associates each CE to the currently correct VPLS attachment.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was Customer MAC addresses appear on the wrong PE after a planned move. The correction addresses the vpls service still contains stale forwarding database or pseudowire mapping; success requires mAC learning associates each CE to the currently correct VPLS attachment.

Incorrect Answers

A:

It confirms an unrelated service correction: The site's VPLS NLRI or RT export settings are incomplete. The present case reports Customer MAC addresses appear on the wrong PE after a planned move. Its completion test is MAC learning associates each CE to the currently correct VPLS attachment.

B:

This result is useful in another case with evidence Service recovers briefly then oscillates when the second pseudowire activates. It does not test recovery from customer mac addresses appear on the wrong pe after a planned move. Check instead whether mAC learning associates each CE to the currently correct VPLS attachment.

C:

That observation would verify a separate fault involving evpn aliasing and backup-path signaling are not aligned for the ethernet segment. Its symptom is Both attachment PEs forward duplicate known unicast after migration. For this case the actual issue is the vpls service still contains stale forwarding database or pseudowire mapping, and the relevant success signal is MAC learning associates each CE to the currently correct VPLS attachment.

Question 727

An operator migrates a VPLS service between PEs. Observed: Customer MAC addresses appear on the wrong PE after a planned move. What is the most likely source of the observed routing or service failure?

  1. Multihoming preference and standby pseudowire behavior were not reconciled.
  2. The VPLS service still contains stale forwarding database or pseudowire mapping.
  3. EVPN aliasing and backup-path signaling are not aligned for the Ethernet segment.
  4. The site's VPLS NLRI or RT export settings are incomplete.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: Customer MAC addresses appear on the wrong PE after a planned move. The specified root issue is The VPLS service still contains stale forwarding database or pseudowire mapping. Repair it through clear stale MAC state safely and update the active VPLS member circuits, then check mAC learning associates each CE to the currently correct VPLS attachment.

Incorrect Answers

A:

That explanation fits another condition: Service recovers briefly then oscillates when the second pseudowire activates. The evidence here is Customer MAC addresses appear on the wrong PE after a planned move. Its closer root cause is The VPLS service still contains stale forwarding database or pseudowire mapping.

C:

The stated cause is possible elsewhere but explains both attachment pes forward duplicate known unicast after migration, not customer mac addresses appear on the wrong pe after a planned move. This incident is better attributed to the vpls service still contains stale forwarding database or pseudowire mapping.

D:

The site's VPLS NLRI or RT export settings are incomplete. would normally be accompanied by one site never joins the full mesh despite a healthy bgp session. The observed symptom is different: Customer MAC addresses appear on the wrong PE after a planned move. The likely cause is The VPLS service still contains stale forwarding database or pseudowire mapping.

Question 728

An operator migrates a VPLS service between PEs. Observed: Customer MAC addresses appear on the wrong PE after a planned move. What operational check best guards against this problem returning?

  1. For each approved related change, verify that known-unicast forwarding uses qualified paths without persistent duplicate frames. Flag recurrence if both attachment PEs forward duplicate known unicast after 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 one active attachment forwards at a time and backup takeover is stable. Flag recurrence if service recovers briefly then oscillates when the second pseudowire activates.
  4. For each approved related change, verify that mAC learning associates each CE to the currently correct VPLS attachment. Flag recurrence if customer MAC addresses appear on the wrong PE after a planned move.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (MAC learning associates each CE to the currently correct VPLS attachment) and flags recurrence of the same failure (Customer MAC addresses appear on the wrong PE after a planned move). It targets the underlying issue, the vpls service still contains stale forwarding database or pseudowire mapping, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to evpn aliasing and backup-path signaling are not aligned for the ethernet segment, typically observed when both attachment PEs forward duplicate known unicast after migration. Here the target is the vpls service still contains stale forwarding database or pseudowire mapping; monitor mAC learning associates each CE to the currently correct VPLS attachment.

B:

This gate monitors a different failure, one site never joins the full mesh despite a healthy bgp session. It would not detect the current problem: Customer MAC addresses appear on the wrong PE after a planned move. The appropriate check requires mAC learning associates each CE to the currently correct VPLS attachment.

C:

It is valid for another service scenario but checks service recovers briefly then oscillates when the second pseudowire activates. This case instead needs a gate for customer mac addresses appear on the wrong pe after a planned move and evidence that mAC learning associates each CE to the currently correct VPLS attachment.

Question 729

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 targeted remediation is most appropriate for the observed condition?

  1. Configure the contracted matching VC ID and compatible circuit signaling on both endpoints.
  2. Advertise the correct VPLS membership information and import targets.
  3. Implement supported VPLS multihoming and loop-control behavior.
  4. Isolate the offending Layer 2 loop and verify EVPN MAC-mobility state.

Explanation

Correct Answer

B:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—One site never joins the full mesh despite a healthy BGP session—is consistent with the site's vpls nlri or rt export settings are incomplete. Use the specified correction, then verify: All intended remote PEs build their customer VPLS peer connections. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different Layer 2 VPNs issue: One endpoint reports a matching neighbor but pseudowire status stays Down. That issue involves the local and remote virtual circuit identifiers do not match. The current symptom is One site never joins the full mesh despite a healthy BGP session. It instead requires advertise the correct VPLS membership information and import targets.

C:

The option may be useful when mAC movement and broadcast storms appear after both CE ports activate, but that is not the current evidence. Here, one site never joins the full mesh despite a healthy BGP session, indicating the site's vpls nlri or rt export settings are incomplete. The targeted action is Advertise the correct VPLS membership information and import targets.

D:

This remediates duplicate mac origin or loop in the underlying customer ethernet segment, normally indicated by The same customer MAC repeatedly moves without a real host migration. It would leave the observed problem (One site never joins the full mesh despite a healthy BGP session) unresolved. Address it with advertise the correct VPLS membership information and import targets.

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.

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