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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 72

Question 710

An interworking pseudowire carries Ethernet between dissimilar CE interfaces. Observed: Data is discarded because the ingress and egress service framing differ. After the correction, which result would most convincingly show that this fault is resolved?

  1. Test frames cross with correct service framing and no unexpected protocol drops.
  2. Moved MACs converge to their new attachment within accepted time.
  3. Each intended site imports the circuit NLRI and builds its matching connection.
  4. The remote PE installs the authorized MAC and forwards unicast across the service.

Explanation

Correct Answer

A:

After select a supported interworking mode and align encapsulation on both PEs, inspect whether test frames cross with correct service framing and no unexpected protocol drops. This closes the loop between the reported observation (Data is discarded because the ingress and egress service framing differ) and the underlying issue (Layer 2 interworking and payload encapsulation expectations are incompatible).

Incorrect Answers

B:

That observation would verify a separate fault involving mac aging and control-plane refresh behavior conflict with the active service topology. Its symptom is One CE continues forwarding to a moved MAC on a stale port. For this case the actual issue is layer 2 interworking and payload encapsulation expectations are incompatible, and the relevant success signal is Test frames cross with correct service framing and no unexpected protocol drops.

C:

This result is useful in another case with evidence One remote PE receives BGP routes but does not establish the required connection. It does not test recovery from data is discarded because the ingress and egress service framing differ. Check instead whether test frames cross with correct service framing and no unexpected protocol drops.

D:

It confirms an unrelated service correction: MAC/IP route type 2 advertisement or its route-target import is missing. The present case reports Data is discarded because the ingress and egress service framing differ. Its completion test is Test frames cross with correct service framing and no unexpected protocol drops.

Question 711

An interworking pseudowire carries Ethernet between dissimilar CE interfaces. Observed: Data is discarded because the ingress and egress service framing differ. Which root cause is most consistent with this symptom?

  1. MAC/IP route type 2 advertisement or its route-target import is missing.
  2. Layer 2 interworking and payload encapsulation expectations are incompatible.
  3. MAC aging and control-plane refresh behavior conflict with the active service topology.
  4. Import route targets do not include the originating L2VPN service.

Explanation

Correct Answer

B:

The reported evidence—Data is discarded because the ingress and egress service framing differ—supports layer 2 interworking and payload encapsulation expectations are incompatible. The appropriate intervention is to select a supported interworking mode and align encapsulation on both PEs, with confirmation from test frames cross with correct service framing and no unexpected protocol drops. Other causes require actual device-state verification.

Incorrect Answers

A:

MAC/IP route type 2 advertisement or its route-target import is missing. would normally be accompanied by the remote pe never learns the mac although evpn bgp neighbors are established. The observed symptom is different: Data is discarded because the ingress and egress service framing differ. The likely cause is Layer 2 interworking and payload encapsulation expectations are incompatible.

C:

The stated cause is possible elsewhere but explains one ce continues forwarding to a moved mac on a stale port, not data is discarded because the ingress and egress service framing differ. This incident is better attributed to layer 2 interworking and payload encapsulation expectations are incompatible.

D:

That explanation fits another condition: One remote PE receives BGP routes but does not establish the required connection. The evidence here is Data is discarded because the ingress and egress service framing differ. Its closer root cause is Layer 2 interworking and payload encapsulation expectations are incompatible.

Question 712

An interworking pseudowire carries Ethernet between dissimilar CE interfaces. Observed: Data is discarded because the ingress and egress service framing differ. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that moved MACs converge to their new attachment within accepted time. Flag recurrence if one CE continues forwarding to a moved MAC on a stale port.
  2. 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.
  3. For each approved related change, verify that the remote PE installs the authorized MAC and forwards unicast across the service. Flag recurrence if the remote PE never learns the MAC although EVPN BGP neighbors are Established.
  4. 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.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Test frames cross with correct service framing and no unexpected protocol drops. and treats Data is discarded because the ingress and egress service framing differ. as a failure signal. The causal concern is layer 2 interworking and payload encapsulation expectations are incompatible.

Incorrect Answers

A:

The proposed control is tied to mac aging and control-plane refresh behavior conflict with the active service topology, typically observed when one CE continues forwarding to a moved MAC on a stale port. Here the target is layer 2 interworking and payload encapsulation expectations are incompatible; monitor test frames cross with correct service framing and no unexpected protocol drops.

B:

It is valid for another service scenario but checks one remote pe receives bgp routes but does not establish the required connection. This case instead needs a gate for data is discarded because the ingress and egress service framing differ and evidence that test frames cross with correct service framing and no unexpected protocol drops.

C:

This gate monitors a different failure, the remote pe never learns the mac although evpn bgp neighbors are established. It would not detect the current problem: Data is discarded because the ingress and egress service framing differ. The appropriate check requires test frames cross with correct service framing and no unexpected protocol drops.

Question 713

A BGP Layer 2 VPN spans three PEs with configured route targets. Observed: One remote PE receives BGP routes but does not establish the required connection. What should the routing engineer change first to address this particular symptom?

  1. Assign unique service site IDs and verify remote mapping calculations.
  2. Repair EVPN all-active multihoming and DF/split-horizon configuration.
  3. Align contracted L2VPN RT memberships on each involved PE.
  4. Restore working transport LSP label switching to the remote PE.

Explanation

Correct Answer

C:

The decisive evidence is that One remote PE receives BGP routes but does not establish the required connection. This follows from import route targets do not include the originating l2vpn service. The focused remedy is to align contracted L2VPN RT memberships on each involved PE. Confirm improvement when each intended site imports the circuit NLRI and builds its matching connection. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This change belongs to a different Layer 2 VPNs issue: Two attachments map to the same site ID and service endpoints conflict. That issue involves site-id uniqueness is not maintained across the pseudowire service. The current symptom is One remote PE receives BGP routes but does not establish the required connection. It instead requires align contracted L2VPN RT memberships on each involved PE.

B:

The option may be useful when a customer-facing CE sees duplicate broadcast frames after a PE failure, but that is not the current evidence. Here, one remote PE receives BGP routes but does not establish the required connection, indicating import route targets do not include the originating l2vpn service. The targeted action is Align contracted L2VPN RT memberships on each involved PE.

D:

This remediates pseudowire service label resolves to a broken mpls transport next hop, normally indicated by Pseudowire signaling remains Up but data drops on one transport path. It would leave the observed problem (One remote PE receives BGP routes but does not establish the required connection) unresolved. Address it with align contracted L2VPN RT memberships on each involved PE.

Question 714

A BGP Layer 2 VPN spans three PEs with configured route targets. Observed: One remote PE receives BGP routes but does not establish the required connection. Which acceptance observation best confirms that the proposed change worked?

  1. Each intended site imports the circuit NLRI and builds its matching connection.
  2. Pseudowire frames reach the far endpoint under both primary and alternate paths.
  3. Only the elected forwarding path replicates BUM traffic and failover stays loss-limited.
  4. The L2VPN forwarding map contains one consistent circuit per intended site.

Explanation

Correct Answer

A:

This acceptance criterion tests the actual fault. The source evidence was One remote PE receives BGP routes but does not establish the required connection. The correction addresses import route targets do not include the originating l2vpn service; success requires each intended site imports the circuit NLRI and builds its matching connection.

Incorrect Answers

B:

This result is useful in another case with evidence Pseudowire signaling remains Up but data drops on one transport path. It does not test recovery from one remote pe receives bgp routes but does not establish the required connection. Check instead whether each intended site imports the circuit NLRI and builds its matching connection.

C:

That observation would verify a separate fault involving ethernet segment split-horizon or designated-forwarder behavior is incorrect. Its symptom is A customer-facing CE sees duplicate broadcast frames after a PE failure. For this case the actual issue is import route targets do not include the originating l2vpn service, and the relevant success signal is Each intended site imports the circuit NLRI and builds its matching connection.

D:

It confirms an unrelated service correction: Site-ID uniqueness is not maintained across the pseudowire service. The present case reports One remote PE receives BGP routes but does not establish the required connection. Its completion test is Each intended site imports the circuit NLRI and builds its matching connection.

Question 715

A BGP Layer 2 VPN spans three PEs with configured route targets. Observed: One remote PE receives BGP routes but does not establish the required connection. What is the most likely source of the observed routing or service failure?

  1. Site-ID uniqueness is not maintained across the pseudowire service.
  2. Ethernet segment split-horizon or designated-forwarder behavior is incorrect.
  3. Import route targets do not include the originating L2VPN service.
  4. Pseudowire service label resolves to a broken MPLS transport next hop.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: One remote PE receives BGP routes but does not establish the required connection. The specified root issue is Import route targets do not include the originating L2VPN service. Repair it through align contracted L2VPN RT memberships on each involved PE, then check each intended site imports the circuit NLRI and builds its matching connection.

Incorrect Answers

A:

Site-ID uniqueness is not maintained across the pseudowire service. would normally be accompanied by two attachments map to the same site id and service endpoints conflict. The observed symptom is different: One remote PE receives BGP routes but does not establish the required connection. The likely cause is Import route targets do not include the originating L2VPN service.

B:

The stated cause is possible elsewhere but explains a customer-facing ce sees duplicate broadcast frames after a pe failure, not one remote pe receives bgp routes but does not establish the required connection. This incident is better attributed to import route targets do not include the originating l2vpn service.

D:

That explanation fits another condition: Pseudowire signaling remains Up but data drops on one transport path. The evidence here is One remote PE receives BGP routes but does not establish the required connection. Its closer root cause is Import route targets do not include the originating L2VPN service.

Question 716

A BGP Layer 2 VPN spans three PEs with configured route targets. Observed: One remote PE receives BGP routes but does not establish the required connection. 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 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.
  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 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.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (Each intended site imports the circuit NLRI and builds its matching connection) and flags recurrence of the same failure (One remote PE receives BGP routes but does not establish the required connection). It targets the underlying issue, import route targets do not include the originating l2vpn service, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to ethernet segment split-horizon or designated-forwarder behavior is incorrect, typically observed when a customer-facing CE sees duplicate broadcast frames after a PE failure. Here the target is import route targets do not include the originating l2vpn service; monitor each intended site imports the circuit NLRI and builds its matching connection.

B:

It is valid for another service scenario but checks pseudowire signaling remains up but data drops on one transport path. This case instead needs a gate for one remote pe receives bgp routes but does not establish the required connection and evidence that each intended site imports the circuit NLRI and builds its matching connection.

C:

This gate monitors a different failure, two attachments map to the same site id and service endpoints conflict. It would not detect the current problem: One remote PE receives BGP routes but does not establish the required connection. The appropriate check requires each intended site imports the circuit NLRI and builds its matching connection.

Question 717

A BGP L2VPN service has duplicate site identifiers. Observed: Two attachments map to the same site ID and service endpoints conflict. Which targeted remediation is most appropriate for the observed condition?

  1. Assign unique service site IDs and verify remote mapping calculations.
  2. Assign the matching planned ESI and compatible ES import/community settings.
  3. Align Ethernet tag/service association across multihomed PEs and verify DF election inputs.
  4. Enable compatible MP-BGP L2VPN family and reflection policy.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Two attachments map to the same site ID and service endpoints conflict—is consistent with site-id uniqueness is not maintained across the pseudowire service. Use the specified correction, then verify: The L2VPN forwarding map contains one consistent circuit per intended site. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This remediates ethernet segment identifier mismatch prevents correct multihoming coordination, normally indicated by Each PE advertises a different ESI for the same physical Ethernet segment. It would leave the observed problem (Two attachments map to the same site ID and service endpoints conflict) unresolved. Address it with assign unique service site IDs and verify remote mapping calculations.

C:

This change belongs to a different Layer 2 VPNs issue: A newly connected PE advertises the service but never forwards BUM frames when elected. That issue involves the pe's df election view disagrees because vlan or ethernet tag association is inconsistent. The current symptom is Two attachments map to the same site ID and service endpoints conflict. It instead requires assign unique service site IDs and verify remote mapping calculations.

D:

The option may be useful when a new spoke receives no Layer 2 VPN membership information, but that is not the current evidence. Here, two attachments map to the same site ID and service endpoints conflict, indicating site-id uniqueness is not maintained across the pseudowire service. The targeted action is Assign unique service site IDs and verify remote mapping calculations.

Question 718

A BGP L2VPN service has duplicate site identifiers. Observed: Two attachments map to the same site ID and service endpoints conflict. What evidence would validate recovery from this precise failure mode?

  1. The L2VPN forwarding map contains one consistent circuit per intended site.
  2. The remote EVPN domain recognizes one common segment and converges on failover.
  3. Each VLAN has the expected DF and BUM traffic follows one permitted path.
  4. Authorized L2VPN NLRI reaches the spoke with intact RD and RT information.

Explanation

Correct Answer

A:

The intended result is The L2VPN forwarding map contains one consistent circuit per intended site. It specifically verifies recovery from site-id uniqueness is not maintained across the pseudowire service, which produced the original symptom: Two attachments map to the same site ID and service endpoints conflict. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

B:

This result is useful in another case with evidence Each PE advertises a different ESI for the same physical Ethernet segment. It does not test recovery from two attachments map to the same site id and service endpoints conflict. Check instead whether the L2VPN forwarding map contains one consistent circuit per intended site.

C:

It confirms an unrelated service correction: The PE's DF election view disagrees because VLAN or Ethernet tag association is inconsistent. The present case reports Two attachments map to the same site ID and service endpoints conflict. Its completion test is The L2VPN forwarding map contains one consistent circuit per intended site.

D:

That observation would verify a separate fault involving the reflector does not negotiate the l2vpn address family for that client. Its symptom is A new spoke receives no Layer 2 VPN membership information. For this case the actual issue is site-id uniqueness is not maintained across the pseudowire service, and the relevant success signal is The L2VPN forwarding map contains one consistent circuit per intended site.

Question 719

A BGP L2VPN service has duplicate site identifiers. Observed: Two attachments map to the same site ID and service endpoints conflict. What underlying protocol or service configuration problem best explains the evidence?

  1. The PE's DF election view disagrees because VLAN or Ethernet tag association is inconsistent.
  2. The reflector does not negotiate the L2VPN address family for that client.
  3. Site-ID uniqueness is not maintained across the pseudowire service.
  4. Ethernet segment identifier mismatch prevents correct multihoming coordination.

Explanation

Correct Answer

C:

Because two attachments map to the same site ID and service endpoints conflict, the likely cause is site-id uniqueness is not maintained across the pseudowire service. It is testable: Assign unique service site IDs and verify remote mapping calculations. Expected follow-up: The L2VPN forwarding map contains one consistent circuit per intended site.

Incorrect Answers

A:

The PE's DF election view disagrees because VLAN or Ethernet tag association is inconsistent. would normally be accompanied by a newly connected pe advertises the service but never forwards bum frames when elected. The observed symptom is different: Two attachments map to the same site ID and service endpoints conflict. The likely cause is Site-ID uniqueness is not maintained across the pseudowire service.

B:

The stated cause is possible elsewhere but explains a new spoke receives no layer 2 vpn membership information, not two attachments map to the same site id and service endpoints conflict. This incident is better attributed to site-id uniqueness is not maintained across the pseudowire service.

D:

That explanation fits another condition: Each PE advertises a different ESI for the same physical Ethernet segment. The evidence here is Two attachments map to the same site ID and service endpoints conflict. Its closer root cause is Site-ID uniqueness is not maintained across the pseudowire service.

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.

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