McAfee-Secured Website

Exam Code: JN0-664

Exam Name: Service Provider Routing and Switching, Professional (JNCIP-SP)

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

100% Juniper JN0-664 Guaranteed Success With Testking Training Materials

Get Real JN0-664 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

96 Questions & Answers with Testing Engine

"Service Provider Routing and Switching, Professional (JNCIP-SP) Exam", also known as JN0-664 exam, is a Juniper certification exam.

Pass your tests with the always up-to-date JN0-664 Exam Engine. Your JN0-664 training materials keep you at the head of the pack!

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Was: $137.49
Now: $124.99

Juniper JN0-664 Practice Test 47

Question 460

A multicast television service requires priority over nightly snapshots. Observed: Multicast video packets are assigned to the lowest-priority class after a classifier update. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that test packets on intended egress show correct markings and reverse traffic remains unchanged. Flag recurrence if downstream peers see markings unchanged while reverse traffic is altered unexpectedly.
  2. For each approved related change, verify that voice packets experience controlled latency while bulk traffic retains available capacity. Flag recurrence if a single FIFO queue holds both low-latency and bulk data traffic.
  3. For each approved related change, verify that congestion counters show preferential dropping of disposable packets. Flag recurrence if both important and disposable video packets are dropped equally in congestion.
  4. For each approved related change, verify that multicast packets land in the approved class and video impairment disappears. Flag recurrence if multicast video packets are assigned to the lowest-priority class after a classifier update.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Multicast packets land in the approved class and video impairment disappears. and treats Multicast video packets are assigned to the lowest-priority class after a classifier update. as a failure signal. The causal concern is the updated dscp-to-forwarding-class table misses the multicast source marking.

Incorrect Answers

A:

It is valid for another service scenario but checks downstream peers see markings unchanged while reverse traffic is altered unexpectedly. This case instead needs a gate for multicast video packets are assigned to the lowest-priority class after a classifier update and evidence that multicast packets land in the approved class and video impairment disappears.

B:

The proposed control is tied to no separate class queue protects delay-sensitive packets from serialization backlog, typically observed when a single FIFO queue holds both low-latency and bulk data traffic. Here the target is the updated dscp-to-forwarding-class table misses the multicast source marking; monitor multicast packets land in the approved class and video impairment disappears.

C:

This gate monitors a different failure, both important and disposable video packets are dropped equally in congestion. It would not detect the current problem: Multicast video packets are assigned to the lowest-priority class after a classifier update. The appropriate check requires multicast packets land in the approved class and video impairment disappears.

Question 461

A provider CoS migration introduces a rewrite policy on the wrong interface direction. Observed: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. What should the routing engineer change first to address this particular symptom?

  1. Move the rewrite policy to the actual egress logical interface with scoped review.
  2. Attach a coherent 802.1p rewrite policy for supported tagged egress frames.
  3. Classify approved voice flows into a suitable forwarding class and assign a protected scheduler.
  4. Restrict the matching filter term to the authorized customer or logical interface.

Explanation

Correct Answer

A:

The decisive evidence is that Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. This follows from the rewrite rule was bound to an interface with the wrong outbound direction. The focused remedy is to move the rewrite policy to the actual egress logical interface with scoped review. Confirm improvement when test packets on intended egress show correct markings and reverse traffic remains unchanged. Validate on an approved lab or change window before touching production.

Incorrect Answers

B:

This remediates an egress ieee 802.1p rewrite map is absent or maps the wrong forwarding class, normally indicated by The 802.1p priority observed downstream no longer matches the agreed enterprise service class. It would leave the observed problem (Downstream peers see markings unchanged while reverse traffic is altered unexpectedly) unresolved. Address it with move the rewrite policy to the actual egress logical interface with scoped review.

C:

This change belongs to a different Class of Service (CoS) issue: Voice jitter rises during backup bursts although interface errors are zero. That issue involves the default forwarding class treats latency-sensitive voice like best-effort traffic. The current symptom is Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. It instead requires move the rewrite policy to the actual egress logical interface with scoped review.

D:

The option may be useful when a broad policer reduces throughput for other tenants on the same interface, but that is not the current evidence. Here, downstream peers see markings unchanged while reverse traffic is altered unexpectedly, indicating the rewrite rule was bound to an interface with the wrong outbound direction. The targeted action is Move the rewrite policy to the actual egress logical interface with scoped review.

Question 462

A provider CoS migration introduces a rewrite policy on the wrong interface direction. Observed: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. Which acceptance observation best confirms that the proposed change worked?

  1. Only the target guest class is capped while unrelated tenants keep their service rate.
  2. Downstream tag captures show the intended priority codepoint values.
  3. Voice delay and jitter stay within the service objective during measured backup load.
  4. Test packets on intended egress show correct markings and reverse traffic remains unchanged.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. The correction addresses the rewrite rule was bound to an interface with the wrong outbound direction; success requires test packets on intended egress show correct markings and reverse traffic remains unchanged.

Incorrect Answers

A:

That observation would verify a separate fault involving the policer was attached to a shared filter term rather than the customer's scoped traffic. Its symptom is A broad policer reduces throughput for other tenants on the same interface. For this case the actual issue is the rewrite rule was bound to an interface with the wrong outbound direction, and the relevant success signal is Test packets on intended egress show correct markings and reverse traffic remains unchanged.

B:

This result is useful in another case with evidence The 802.1p priority observed downstream no longer matches the agreed enterprise service class. It does not test recovery from downstream peers see markings unchanged while reverse traffic is altered unexpectedly. Check instead whether test packets on intended egress show correct markings and reverse traffic remains unchanged.

C:

It confirms an unrelated service correction: The default forwarding class treats latency-sensitive voice like best-effort traffic. The present case reports Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. Its completion test is Test packets on intended egress show correct markings and reverse traffic remains unchanged.

Question 463

A provider CoS migration introduces a rewrite policy on the wrong interface direction. Observed: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. What is the most likely source of the observed routing or service failure?

  1. The rewrite rule was bound to an interface with the wrong outbound direction.
  2. The policer was attached to a shared filter term rather than the customer's scoped traffic.
  3. An egress IEEE 802.1p rewrite map is absent or maps the wrong forwarding class.
  4. The default forwarding class treats latency-sensitive voice like best-effort traffic.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. The specified root issue is The rewrite rule was bound to an interface with the wrong outbound direction. Repair it through move the rewrite policy to the actual egress logical interface with scoped review, then check test packets on intended egress show correct markings and reverse traffic remains unchanged.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains a broad policer reduces throughput for other tenants on the same interface, not downstream peers see markings unchanged while reverse traffic is altered unexpectedly. This incident is better attributed to the rewrite rule was bound to an interface with the wrong outbound direction.

C:

That explanation fits another condition: The 802.1p priority observed downstream no longer matches the agreed enterprise service class. The evidence here is Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. Its closer root cause is The rewrite rule was bound to an interface with the wrong outbound direction.

D:

The default forwarding class treats latency-sensitive voice like best-effort traffic. would normally be accompanied by voice jitter rises during backup bursts although interface errors are zero. The observed symptom is different: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. The likely cause is The rewrite rule was bound to an interface with the wrong outbound direction.

Question 464

A provider CoS migration introduces a rewrite policy on the wrong interface direction. Observed: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. What operational check best guards against this problem returning?

  1. For each approved related change, verify that downstream tag captures show the intended priority codepoint values. Flag recurrence if the 802.1p priority observed downstream no longer matches the agreed enterprise service class.
  2. For each approved related change, verify that test packets on intended egress show correct markings and reverse traffic remains unchanged. Flag recurrence if downstream peers see markings unchanged while reverse traffic is altered unexpectedly.
  3. For each approved related change, verify that voice delay and jitter stay within the service objective during measured backup load. Flag recurrence if voice jitter rises during backup bursts although interface errors are zero.
  4. For each approved related change, verify that only the target guest class is capped while unrelated tenants keep their service rate. Flag recurrence if a broad policer reduces throughput for other tenants on the same interface.

Explanation

Correct Answer

B:

This control asks for the same recovery evidence (Test packets on intended egress show correct markings and reverse traffic remains unchanged) and flags recurrence of the same failure (Downstream peers see markings unchanged while reverse traffic is altered unexpectedly). It targets the underlying issue, the rewrite rule was bound to an interface with the wrong outbound direction, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

It is valid for another service scenario but checks the 802.1p priority observed downstream no longer matches the agreed enterprise service class. This case instead needs a gate for downstream peers see markings unchanged while reverse traffic is altered unexpectedly and evidence that test packets on intended egress show correct markings and reverse traffic remains unchanged.

C:

This gate monitors a different failure, voice jitter rises during backup bursts although interface errors are zero. It would not detect the current problem: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. The appropriate check requires test packets on intended egress show correct markings and reverse traffic remains unchanged.

D:

The proposed control is tied to the policer was attached to a shared filter term rather than the customer's scoped traffic, typically observed when a broad policer reduces throughput for other tenants on the same interface. Here the target is the rewrite rule was bound to an interface with the wrong outbound direction; monitor test packets on intended egress show correct markings and reverse traffic remains unchanged.

Question 465

A provider enables PIM sparse mode for multicast TV. Observed: Sources transmit packets but receivers see none until a static join is added. Which targeted remediation is most appropriate for the observed condition?

  1. Permit authorized PIM neighbor control traffic without opening unrelated multicast flood.
  2. Enable supported SSM group range and source-specific membership throughout the path.
  3. Enable IGMPv3 and configure a matching source and group membership.
  4. Configure consistent reachable RP discovery or static RP for authorized ASM groups.

Explanation

Correct Answer

D:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Sources transmit packets but receivers see none until a static join is added—is consistent with the rendezvous point address is missing or unreachable for the asm group. Use the specified correction, then verify: Receiver joins build a shared tree and receive source packets. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different IP Multicast issue: PIM Hellos traverse a link whose multicast control traffic is filtered. That issue involves a control-plane filter blocks required pim packets on the transit segment. The current symptom is Sources transmit packets but receivers see none until a static join is added. It instead requires configure consistent reachable RP discovery or static RP for authorized ASM groups.

B:

This remediates legacy any-source join configuration remains after the ssm group move, normally indicated by Receiver packets still target a shared-tree RP that no longer has active mapping. It would leave the observed problem (Sources transmit packets but receivers see none until a static join is added) unresolved. Address it with configure consistent reachable RP discovery or static RP for authorized ASM groups.

C:

The option may be useful when the route never appears despite an active local IGMPv2 membership, but that is not the current evidence. Here, sources transmit packets but receivers see none until a static join is added, indicating the rendezvous point address is missing or unreachable for the asm group. The targeted action is Configure consistent reachable RP discovery or static RP for authorized ASM groups.

Question 466

A provider enables PIM sparse mode for multicast TV. Observed: Sources transmit packets but receivers see none until a static join is added. What evidence would validate recovery from this precise failure mode?

  1. PIM neighbors remain Up and multicast joins propagate.
  2. The receiver establishes an (S,G) state for the intended channel.
  3. The (S,G) tree becomes active without RP dependency for SSM addresses.
  4. Receiver joins build a shared tree and receive source packets.

Explanation

Correct Answer

D:

The intended result is Receiver joins build a shared tree and receive source packets. It specifically verifies recovery from the rendezvous point address is missing or unreachable for the asm group, which produced the original symptom: Sources transmit packets but receivers see none until a static join is added. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: A control-plane filter blocks required PIM packets on the transit segment. The present case reports Sources transmit packets but receivers see none until a static join is added. Its completion test is Receiver joins build a shared tree and receive source packets.

B:

That observation would verify a separate fault involving source-specific join signaling requires igmpv3 or supported source filters. Its symptom is The route never appears despite an active local IGMPv2 membership. For this case the actual issue is the rendezvous point address is missing or unreachable for the asm group, and the relevant success signal is Receiver joins build a shared tree and receive source packets.

C:

This result is useful in another case with evidence Receiver packets still target a shared-tree RP that no longer has active mapping. It does not test recovery from sources transmit packets but receivers see none until a static join is added. Check instead whether receiver joins build a shared tree and receive source packets.

Question 467

A provider enables PIM sparse mode for multicast TV. Observed: Sources transmit packets but receivers see none until a static join is added. What underlying protocol or service configuration problem best explains the evidence?

  1. Legacy any-source join configuration remains after the SSM group move.
  2. The rendezvous point address is missing or unreachable for the ASM group.
  3. Source-specific join signaling requires IGMPv3 or supported source filters.
  4. A control-plane filter blocks required PIM packets on the transit segment.

Explanation

Correct Answer

B:

Because sources transmit packets but receivers see none until a static join is added, the likely cause is the rendezvous point address is missing or unreachable for the asm group. It is testable: Configure consistent reachable RP discovery or static RP for authorized ASM groups. Expected follow-up: Receiver joins build a shared tree and receive source packets.

Incorrect Answers

A:

That explanation fits another condition: Receiver packets still target a shared-tree RP that no longer has active mapping. The evidence here is Sources transmit packets but receivers see none until a static join is added. Its closer root cause is The rendezvous point address is missing or unreachable for the ASM group.

C:

The stated cause is possible elsewhere but explains the route never appears despite an active local igmpv2 membership, not sources transmit packets but receivers see none until a static join is added. This incident is better attributed to the rendezvous point address is missing or unreachable for the asm group.

D:

A control-plane filter blocks required PIM packets on the transit segment. would normally be accompanied by pim hellos traverse a link whose multicast control traffic is filtered. The observed symptom is different: Sources transmit packets but receivers see none until a static join is added. The likely cause is The rendezvous point address is missing or unreachable for the ASM group.

Question 468

A provider enables PIM sparse mode for multicast TV. Observed: Sources transmit packets but receivers see none until a static join is added. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that receiver joins build a shared tree and receive source packets. Flag recurrence if sources transmit packets but receivers see none until a static join is added.
  2. For each approved related change, verify that the receiver establishes an (S,G) state for the intended channel. Flag recurrence if the route never appears despite an active local IGMPv2 membership.
  3. For each approved related change, verify that the (S,G) tree becomes active without RP dependency for SSM addresses. Flag recurrence if receiver packets still target a shared-tree RP that no longer has active mapping.
  4. For each approved related change, verify that pIM neighbors remain Up and multicast joins propagate. Flag recurrence if pIM Hellos traverse a link whose multicast control traffic is filtered.

Explanation

Correct Answer

A:

A useful regression gate tests whether receiver joins build a shared tree and receive source packets and alerts when sources transmit packets but receivers see none until a static join is added. This directly checks the technical weakness: The rendezvous point address is missing or unreachable for the ASM group. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

The proposed control is tied to source-specific join signaling requires igmpv3 or supported source filters, typically observed when the route never appears despite an active local IGMPv2 membership. Here the target is the rendezvous point address is missing or unreachable for the asm group; monitor receiver joins build a shared tree and receive source packets.

C:

It is valid for another service scenario but checks receiver packets still target a shared-tree rp that no longer has active mapping. This case instead needs a gate for sources transmit packets but receivers see none until a static join is added and evidence that receiver joins build a shared tree and receive source packets.

D:

This gate monitors a different failure, pim hellos traverse a link whose multicast control traffic is filtered. It would not detect the current problem: Sources transmit packets but receivers see none until a static join is added. The appropriate check requires receiver joins build a shared tree and receive source packets.

Question 469

An IPTV receiver joins an SSM multicast channel. Observed: The route never appears despite an active local IGMPv2 membership. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Separate SSM and ASM address ranges in the multicast configuration.
  2. Align supported MVPN provider tunnel and customer multicast routing design.
  3. Repair source RPF reachability and ingress interface alignment.
  4. Enable IGMPv3 and configure a matching source and group membership.

Explanation

Correct Answer

D:

The observed condition is The route never appears despite an active local IGMPv2 membership. That indicates source-specific join signaling requires igmpv3 or supported source filters. Applying the proposed remedy directly changes that condition. A concrete completion check is: The receiver establishes an (S,G) state for the intended channel.

Incorrect Answers

A:

This change belongs to a different IP Multicast issue: A legacy ASM group is interpreted as source-specific and cannot use its RP. That issue involves ssm group-range classification overlaps with the existing asm service. The current symptom is The route never appears despite an active local IGMPv2 membership. It instead requires enable IGMPv3 and configure a matching source and group membership.

B:

The option may be useful when the provider MVPN receives control routes but does not deliver customer stream data, but that is not the current evidence. Here, the route never appears despite an active local IGMPv2 membership, indicating source-specific join signaling requires igmpv3 or supported source filters. The targeted action is Enable IGMPv3 and configure a matching source and group membership.

C:

This remediates unicast routing points toward the source through a different incoming interface, normally indicated by Packets are dropped by reverse-path-forwarding checks. It would leave the observed problem (The route never appears despite an active local IGMPv2 membership) unresolved. Address it with enable IGMPv3 and configure a matching source and group membership.

Question 470

An IPTV receiver joins an SSM multicast channel. Observed: The route never appears despite an active local IGMPv2 membership. After the correction, which result would most convincingly show that this fault is resolved?

  1. Both old ASM and new SSM groups build trees appropriate to their mode.
  2. Customer receiver receives packets with correct isolated MVPN forwarding.
  3. RPF checks succeed and packets forward along the source tree.
  4. The receiver establishes an (S,G) state for the intended channel.

Explanation

Correct Answer

D:

After enable IGMPv3 and configure a matching source and group membership, inspect whether the receiver establishes an (S,G) state for the intended channel. This closes the loop between the reported observation (The route never appears despite an active local IGMPv2 membership) and the underlying issue (Source-specific join signaling requires IGMPv3 or supported source filters).

Incorrect Answers

A:

It confirms an unrelated service correction: SSM group-range classification overlaps with the existing ASM service. The present case reports The route never appears despite an active local IGMPv2 membership. Its completion test is The receiver establishes an (S,G) state for the intended channel.

B:

That observation would verify a separate fault involving multicast vpn service control signaling and transport tunnel mapping do not match. Its symptom is The provider MVPN receives control routes but does not deliver customer stream data. For this case the actual issue is source-specific join signaling requires igmpv3 or supported source filters, and the relevant success signal is The receiver establishes an (S,G) state for the intended channel.

C:

This result is useful in another case with evidence Packets are dropped by reverse-path-forwarding checks. It does not test recovery from the route never appears despite an active local igmpv2 membership. Check instead whether the receiver establishes an (S,G) state for the intended channel.

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