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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 76

Question 750

An EVPN service uses an all-active multihomed Ethernet segment. Observed: A customer-facing CE sees duplicate broadcast frames after a PE failure. Which acceptance observation best confirms that the proposed change worked?

  1. Pseudowire frames reach the far endpoint under both primary and alternate paths.
  2. Test frames cross with correct service framing and no unexpected protocol drops.
  3. Only the elected forwarding path replicates BUM traffic and failover stays loss-limited.
  4. The remote EVPN domain recognizes one common segment and converges on failover.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was A customer-facing CE sees duplicate broadcast frames after a PE failure. The correction addresses ethernet segment split-horizon or designated-forwarder behavior is incorrect; success requires only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

Incorrect Answers

A:

That observation would verify a separate fault involving pseudowire service label resolves to a broken mpls transport next hop. Its symptom is Pseudowire signaling remains Up but data drops on one transport path. For this case the actual issue is ethernet segment split-horizon or designated-forwarder behavior is incorrect, and the relevant success signal is Only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

B:

This result is useful in another case with evidence Data is discarded because the ingress and egress service framing differ. It does not test recovery from a customer-facing ce sees duplicate broadcast frames after a pe failure. Check instead whether only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

D:

It confirms an unrelated service correction: Ethernet segment identifier mismatch prevents correct multihoming coordination. The present case reports A customer-facing CE sees duplicate broadcast frames after a PE failure. Its completion test is Only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

Question 751

An EVPN service uses an all-active multihomed Ethernet segment. Observed: A customer-facing CE sees duplicate broadcast frames after a PE failure. What is the most likely source of the observed routing or service failure?

  1. Layer 2 interworking and payload encapsulation expectations are incompatible.
  2. Ethernet segment split-horizon or designated-forwarder behavior is incorrect.
  3. Ethernet segment identifier mismatch prevents correct multihoming coordination.
  4. Pseudowire service label resolves to a broken MPLS transport next hop.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: A customer-facing CE sees duplicate broadcast frames after a PE failure. The specified root issue is Ethernet segment split-horizon or designated-forwarder behavior is incorrect. Repair it through repair EVPN all-active multihoming and DF/split-horizon configuration, then check only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

Incorrect Answers

A:

That explanation fits another condition: Data is discarded because the ingress and egress service framing differ. The evidence here is A customer-facing CE sees duplicate broadcast frames after a PE failure. Its closer root cause is Ethernet segment split-horizon or designated-forwarder behavior is incorrect.

C:

Ethernet segment identifier mismatch prevents correct multihoming coordination. would normally be accompanied by each pe advertises a different esi for the same physical ethernet segment. The observed symptom is different: A customer-facing CE sees duplicate broadcast frames after a PE failure. The likely cause is Ethernet segment split-horizon or designated-forwarder behavior is incorrect.

D:

The stated cause is possible elsewhere but explains pseudowire signaling remains up but data drops on one transport path, not a customer-facing ce sees duplicate broadcast frames after a pe failure. This incident is better attributed to ethernet segment split-horizon or designated-forwarder behavior is incorrect.

Question 752

An EVPN service uses an all-active multihomed Ethernet segment. Observed: A customer-facing CE sees duplicate broadcast frames after a PE failure. What operational check best guards against this problem returning?

  1. For each approved related change, verify that only the elected forwarding path replicates BUM traffic and failover stays loss-limited. Flag recurrence if a customer-facing CE sees duplicate broadcast frames after a PE failure.
  2. For each approved related change, verify that test frames cross with correct service framing and no unexpected protocol drops. Flag recurrence if data is discarded because the ingress and egress service framing differ.
  3. 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.
  4. For each approved related change, verify that pseudowire frames reach the far endpoint under both primary and alternate paths. Flag recurrence if pseudowire signaling remains Up but data drops on one transport path.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (Only the elected forwarding path replicates BUM traffic and failover stays loss-limited) and flags recurrence of the same failure (A customer-facing CE sees duplicate broadcast frames after a PE failure). It targets the underlying issue, ethernet segment split-horizon or designated-forwarder behavior is incorrect, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

It is valid for another service scenario but checks data is discarded because the ingress and egress service framing differ. This case instead needs a gate for a customer-facing ce sees duplicate broadcast frames after a pe failure and evidence that only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

C:

This gate monitors a different failure, each pe advertises a different esi for the same physical ethernet segment. It would not detect the current problem: A customer-facing CE sees duplicate broadcast frames after a PE failure. The appropriate check requires only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

D:

The proposed control is tied to pseudowire service label resolves to a broken mpls transport next hop, typically observed when pseudowire signaling remains Up but data drops on one transport path. Here the target is ethernet segment split-horizon or designated-forwarder behavior is incorrect; monitor only the elected forwarding path replicates BUM traffic and failover stays loss-limited.

Question 753

An EVPN multihomed access switch has two connected PEs. Observed: Each PE advertises a different ESI for the same physical Ethernet segment. Which targeted remediation is most appropriate for the observed condition?

  1. Assign the matching planned ESI and compatible ES import/community settings.
  2. Restore proper EVPN Type-3 import and replication next-hop resolution.
  3. Align contracted L2VPN RT memberships on each involved PE.
  4. Align Ethernet tag/service association across multihomed PEs and verify DF election inputs.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Each PE advertises a different ESI for the same physical Ethernet segment—is consistent with ethernet segment identifier mismatch prevents correct multihoming coordination. Use the specified correction, then verify: The remote EVPN domain recognizes one common segment and converges on failover. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

The option may be useful when broadcast and unknown-unicast traffic never reaches one remote PE, but that is not the current evidence. Here, each PE advertises a different ESI for the same physical Ethernet segment, indicating ethernet segment identifier mismatch prevents correct multihoming coordination. The targeted action is Assign the matching planned ESI and compatible ES import/community settings.

C:

This change belongs to a different Layer 2 VPNs issue: One remote PE receives BGP routes but does not establish the required connection. That issue involves import route targets do not include the originating l2vpn service. The current symptom is Each PE advertises a different ESI for the same physical Ethernet segment. It instead requires assign the matching planned ESI and compatible ES import/community settings.

D:

This remediates the pe's df election view disagrees because vlan or ethernet tag association is inconsistent, normally indicated by A newly connected PE advertises the service but never forwards BUM frames when elected. It would leave the observed problem (Each PE advertises a different ESI for the same physical Ethernet segment) unresolved. Address it with assign the matching planned ESI and compatible ES import/community settings.

Question 754

An EVPN multihomed access switch has two connected PEs. Observed: Each PE advertises a different ESI for the same physical Ethernet segment. What evidence would validate recovery from this precise failure mode?

  1. Each VLAN has the expected DF and BUM traffic follows one permitted path.
  2. BUM traffic reaches each subscribed PE exactly as permitted.
  3. The remote EVPN domain recognizes one common segment and converges on failover.
  4. Each intended site imports the circuit NLRI and builds its matching connection.

Explanation

Correct Answer

C:

The intended result is The remote EVPN domain recognizes one common segment and converges on failover. It specifically verifies recovery from ethernet segment identifier mismatch prevents correct multihoming coordination, which produced the original symptom: Each PE advertises a different ESI for the same physical Ethernet segment. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence A newly connected PE advertises the service but never forwards BUM frames when elected. It does not test recovery from each pe advertises a different esi for the same physical ethernet segment. Check instead whether the remote EVPN domain recognizes one common segment and converges on failover.

B:

That observation would verify a separate fault involving the receiving pe lacks an eligible ingress-replication membership or tunnel mapping. Its symptom is Broadcast and unknown-unicast traffic never reaches one remote PE. For this case the actual issue is ethernet segment identifier mismatch prevents correct multihoming coordination, and the relevant success signal is The remote EVPN domain recognizes one common segment and converges on failover.

D:

It confirms an unrelated service correction: Import route targets do not include the originating L2VPN service. The present case reports Each PE advertises a different ESI for the same physical Ethernet segment. Its completion test is The remote EVPN domain recognizes one common segment and converges on failover.

Question 755

An EVPN multihomed access switch has two connected PEs. Observed: Each PE advertises a different ESI for the same physical Ethernet segment. What underlying protocol or service configuration problem best explains the evidence?

  1. Ethernet segment identifier mismatch prevents correct multihoming coordination.
  2. The PE's DF election view disagrees because VLAN or Ethernet tag association is inconsistent.
  3. Import route targets do not include the originating L2VPN service.
  4. The receiving PE lacks an eligible ingress-replication membership or tunnel mapping.

Explanation

Correct Answer

A:

Because each PE advertises a different ESI for the same physical Ethernet segment, the likely cause is ethernet segment identifier mismatch prevents correct multihoming coordination. It is testable: Assign the matching planned ESI and compatible ES import/community settings. Expected follow-up: The remote EVPN domain recognizes one common segment and converges on failover.

Incorrect Answers

B:

That explanation fits another condition: A newly connected PE advertises the service but never forwards BUM frames when elected. The evidence here is Each PE advertises a different ESI for the same physical Ethernet segment. Its closer root cause is Ethernet segment identifier mismatch prevents correct multihoming coordination.

C:

Import route targets do not include the originating L2VPN service. would normally be accompanied by one remote pe receives bgp routes but does not establish the required connection. The observed symptom is different: Each PE advertises a different ESI for the same physical Ethernet segment. The likely cause is Ethernet segment identifier mismatch prevents correct multihoming coordination.

D:

The stated cause is possible elsewhere but explains broadcast and unknown-unicast traffic never reaches one remote pe, not each pe advertises a different esi for the same physical ethernet segment. This incident is better attributed to ethernet segment identifier mismatch prevents correct multihoming coordination.

Question 756

An EVPN multihomed access switch has two connected PEs. Observed: Each PE advertises a different ESI for the same physical Ethernet segment. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  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 each intended site imports the circuit NLRI and builds its matching connection. Flag recurrence if one remote PE receives BGP routes but does not establish the required connection.
  4. 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.

Explanation

Correct Answer

B:

A useful regression gate tests whether the remote EVPN domain recognizes one common segment and converges on failover and alerts when each PE advertises a different ESI for the same physical Ethernet segment. This directly checks the technical weakness: Ethernet segment identifier mismatch prevents correct multihoming coordination. 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 a newly connected pe advertises the service but never forwards bum frames when elected. This case instead needs a gate for each pe advertises a different esi for the same physical ethernet segment and evidence that the remote EVPN domain recognizes one common segment and converges on failover.

C:

This gate monitors a different failure, one remote pe receives bgp routes but does not establish the required connection. It would not detect the current problem: Each PE advertises a different ESI for the same physical Ethernet segment. The appropriate check requires the remote EVPN domain recognizes one common segment and converges on failover.

D:

The proposed control is tied to the receiving pe lacks an eligible ingress-replication membership or tunnel mapping, typically observed when broadcast and unknown-unicast traffic never reaches one remote PE. Here the target is ethernet segment identifier mismatch prevents correct multihoming coordination; monitor the remote EVPN domain recognizes one common segment and converges on failover.

Question 757

A provider learns an EVPN Type-3 inclusive multicast route. Observed: Broadcast and unknown-unicast traffic never reaches one remote PE. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Restore proper EVPN Type-3 import and replication next-hop resolution.
  2. Assign unique service site IDs and verify remote mapping calculations.
  3. Configure supported all-active ES routes and aliasing behavior.
  4. Assign isolated RT import/export sets and check per-service forwarding instance.

Explanation

Correct Answer

A:

The observed condition is Broadcast and unknown-unicast traffic never reaches one remote PE. That indicates the receiving pe lacks an eligible ingress-replication membership or tunnel mapping. Applying the proposed remedy directly changes that condition. A concrete completion check is: BUM traffic reaches each subscribed PE exactly as permitted.

Incorrect Answers

B:

The option may be useful when two attachments map to the same site ID and service endpoints conflict, but that is not the current evidence. Here, broadcast and unknown-unicast traffic never reaches one remote PE, indicating the receiving pe lacks an eligible ingress-replication membership or tunnel mapping. The targeted action is Restore proper EVPN Type-3 import and replication next-hop resolution.

C:

This remediates evpn aliasing and backup-path signaling are not aligned for the ethernet segment, normally indicated by Both attachment PEs forward duplicate known unicast after migration. It would leave the observed problem (Broadcast and unknown-unicast traffic never reaches one remote PE) unresolved. Address it with restore proper EVPN Type-3 import and replication next-hop resolution.

D:

This change belongs to a different Layer 2 VPNs issue: A transit PE imports endpoints from an unrelated L2VPN. That issue involves l2vpn rt filters permit cross-service membership despite separate service definitions. The current symptom is Broadcast and unknown-unicast traffic never reaches one remote PE. It instead requires restore proper EVPN Type-3 import and replication next-hop resolution.

Question 758

A provider learns an EVPN Type-3 inclusive multicast route. Observed: Broadcast and unknown-unicast traffic never reaches one remote PE. After the correction, which result would most convincingly show that this fault is resolved?

  1. BUM traffic reaches each subscribed PE exactly as permitted.
  2. Every customer VPLS or circuit includes only its authorized sites.
  3. The L2VPN forwarding map contains one consistent circuit per intended site.
  4. Known-unicast forwarding uses qualified paths without persistent duplicate frames.

Explanation

Correct Answer

A:

After restore proper EVPN Type-3 import and replication next-hop resolution, inspect whether bUM traffic reaches each subscribed PE exactly as permitted. This closes the loop between the reported observation (Broadcast and unknown-unicast traffic never reaches one remote PE) and the underlying issue (The receiving PE lacks an eligible ingress-replication membership or tunnel mapping).

Incorrect Answers

B:

It confirms an unrelated service correction: L2VPN RT filters permit cross-service membership despite separate service definitions. The present case reports Broadcast and unknown-unicast traffic never reaches one remote PE. Its completion test is BUM traffic reaches each subscribed PE exactly as permitted.

C:

That observation would verify a separate fault involving site-id uniqueness is not maintained across the pseudowire service. Its symptom is Two attachments map to the same site ID and service endpoints conflict. For this case the actual issue is the receiving pe lacks an eligible ingress-replication membership or tunnel mapping, and the relevant success signal is BUM traffic reaches each subscribed PE exactly as permitted.

D:

This result is useful in another case with evidence Both attachment PEs forward duplicate known unicast after migration. It does not test recovery from broadcast and unknown-unicast traffic never reaches one remote pe. Check instead whether bUM traffic reaches each subscribed PE exactly as permitted.

Question 759

A provider learns an EVPN Type-3 inclusive multicast route. Observed: Broadcast and unknown-unicast traffic never reaches one remote PE. Which root cause is most consistent with this symptom?

  1. EVPN aliasing and backup-path signaling are not aligned for the Ethernet segment.
  2. Site-ID uniqueness is not maintained across the pseudowire service.
  3. L2VPN RT filters permit cross-service membership despite separate service definitions.
  4. The receiving PE lacks an eligible ingress-replication membership or tunnel mapping.

Explanation

Correct Answer

D:

The reported evidence—Broadcast and unknown-unicast traffic never reaches one remote PE—supports the receiving pe lacks an eligible ingress-replication membership or tunnel mapping. The appropriate intervention is to restore proper EVPN Type-3 import and replication next-hop resolution, with confirmation from bUM traffic reaches each subscribed PE exactly as permitted. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: Both attachment PEs forward duplicate known unicast after migration. The evidence here is Broadcast and unknown-unicast traffic never reaches one remote PE. Its closer root cause is The receiving PE lacks an eligible ingress-replication membership or tunnel mapping.

B:

The stated cause is possible elsewhere but explains two attachments map to the same site id and service endpoints conflict, not broadcast and unknown-unicast traffic never reaches one remote pe. This incident is better attributed to the receiving pe lacks an eligible ingress-replication membership or tunnel mapping.

C:

L2VPN RT filters permit cross-service membership despite separate service definitions. would normally be accompanied by a transit pe imports endpoints from an unrelated l2vpn. The observed symptom is different: Broadcast and unknown-unicast traffic never reaches one remote PE. The likely cause is The receiving PE lacks an eligible ingress-replication membership or tunnel mapping.

Question 760

A provider learns an EVPN Type-3 inclusive multicast route. Observed: Broadcast and unknown-unicast traffic never reaches one remote PE. 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 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.
  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 known-unicast forwarding uses qualified paths without persistent duplicate frames. Flag recurrence if both attachment PEs forward duplicate known unicast after migration.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result BUM traffic reaches each subscribed PE exactly as permitted. and treats Broadcast and unknown-unicast traffic never reaches one remote PE. as a failure signal. The causal concern is the receiving pe lacks an eligible ingress-replication membership or tunnel mapping.

Incorrect Answers

B:

The proposed control is tied to site-id uniqueness is not maintained across the pseudowire service, typically observed when two attachments map to the same site ID and service endpoints conflict. Here the target is the receiving pe lacks an eligible ingress-replication membership or tunnel mapping; monitor bUM traffic reaches each subscribed PE exactly as permitted.

C:

This gate monitors a different failure, a transit pe imports endpoints from an unrelated l2vpn. It would not detect the current problem: Broadcast and unknown-unicast traffic never reaches one remote PE. The appropriate check requires bUM traffic reaches each subscribed PE exactly as permitted.

D:

It is valid for another service scenario but checks both attachment pes forward duplicate known unicast after migration. This case instead needs a gate for broadcast and unknown-unicast traffic never reaches one remote pe and evidence that bUM traffic reaches each subscribed PE exactly as permitted.

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