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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 65

Question 640

An enterprise network designer recommends: Inspect LLDP neighbor detail and advertised LLDP-MED policy information. Which situation most clearly calls for this action?

  1. An IP phone expects automatic switch voice policy but the access port has LLDP-MED advertisement disabled.
  2. Employee PCs and VoIP phones share an office switch but voice packets need their own logical broadcast domain.
  3. A phone is not receiving the expected voice settings and administrators need evidence of whether the switch recognizes it as a neighbor.
  4. A new IP phone should learn its designated voice VLAN and applicable network policy from the Ethernet switch automatically.

Explanation

Correct Answer

C:

This case requires the LLDP neighbor inspection action. The engineer can verify device discovery and the voice policy offered on the port.

Incorrect Answers

A:

This other case would be better matched to Enable supported LLDP and LLDP-MED functionality for the voice access port. Voice endpoint network policies can be announced to compatible phones.

B:

This other case would be better matched to Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

D:

This other case would be better matched to Advertise the supported LLDP-MED network policy toward the phone. The phone can discover the intended voice VLAN information from the access switch.

Question 641

A phone tags frames for voice VLAN 210, but the upstream switch accepts only VLAN 200 as the voice VLAN. Which Junos networking action or protocol decision best addresses this requirement?

  1. Align the advertised and permitted voice VLAN identifier across the phone and switching port.
  2. Advertise the supported LLDP-MED network policy toward the phone.
  3. Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.
  4. Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.

Explanation

Correct Answer

A:

This action addresses Voice tag mismatch. Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.

Incorrect Answers

B:

That action targets LLDP-MED network policy: The phone can discover the intended voice VLAN information from the access switch. It does not directly resolve the stated Voice tag mismatch requirement.

C:

That action targets Phone and PC passthrough: The phone can use its voice VLAN while untagged PC traffic follows the data VLAN. It does not directly resolve the stated Voice tag mismatch requirement.

D:

That action targets Voice VLAN separation: Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure. It does not directly resolve the stated Voice tag mismatch requirement.

Question 642

A Junos network engineer takes this step: Align the advertised and permitted voice VLAN identifier across the phone and switching port. Which outcome most directly follows?

  1. The phone can discover the intended voice VLAN information from the access switch.
  2. Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.
  3. The phone can use its voice VLAN while untagged PC traffic follows the data VLAN.
  4. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

Explanation

Correct Answer

B:

This is the direct result of the Voice tag mismatch decision: Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.

Incorrect Answers

A:

This outcome is associated with LLDP-MED network policy (Advertise the supported LLDP-MED network policy toward the phone.), not the specified action.

C:

This outcome is associated with Phone and PC passthrough (Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.), not the specified action.

D:

This outcome is associated with Voice VLAN separation (Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.), not the specified action.

Question 643

A phone tags frames for voice VLAN 210, but the upstream switch accepts only VLAN 200 as the voice VLAN. A colleague instead suggests: Advertise the supported LLDP-MED network policy toward the phone. Which corrective approach most directly addresses the original issue?

  1. Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.
  2. Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.
  3. Align the advertised and permitted voice VLAN identifier across the phone and switching port.
  4. Advertise the supported LLDP-MED network policy toward the phone.

Explanation

Correct Answer

C:

This corrective choice addresses Voice tag mismatch. Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.

Incorrect Answers

A:

That alternative applies to Voice VLAN separation instead. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

B:

That alternative applies to Phone and PC passthrough instead. The phone can use its voice VLAN while untagged PC traffic follows the data VLAN.

D:

That alternative applies to LLDP-MED network policy instead. The phone can discover the intended voice VLAN information from the access switch.

Question 644

An enterprise network designer recommends: Align the advertised and permitted voice VLAN identifier across the phone and switching port. Which situation most clearly calls for this action?

  1. A desk phone sits between the wall switch and a computer; voice is tagged but the computer sends ordinary untagged traffic.
  2. A new IP phone should learn its designated voice VLAN and applicable network policy from the Ethernet switch automatically.
  3. Employee PCs and VoIP phones share an office switch but voice packets need their own logical broadcast domain.
  4. A phone tags frames for voice VLAN 210, but the upstream switch accepts only VLAN 200 as the voice VLAN.

Explanation

Correct Answer

D:

This case requires the Voice tag mismatch action. Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.

Incorrect Answers

A:

This other case would be better matched to Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain. The phone can use its voice VLAN while untagged PC traffic follows the data VLAN.

B:

This other case would be better matched to Advertise the supported LLDP-MED network policy toward the phone. The phone can discover the intended voice VLAN information from the access switch.

C:

This other case would be better matched to Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

Question 645

An IP phone expects automatic switch voice policy but the access port has LLDP-MED advertisement disabled. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect LLDP neighbor detail and advertised LLDP-MED policy information.
  2. Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.
  3. Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.
  4. Enable supported LLDP and LLDP-MED functionality for the voice access port.

Explanation

Correct Answer

D:

This action addresses LLDP-MED discovery disabled. Voice endpoint network policies can be announced to compatible phones.

Incorrect Answers

A:

That action targets LLDP neighbor inspection: The engineer can verify device discovery and the voice policy offered on the port. It does not directly resolve the stated LLDP-MED discovery disabled requirement.

B:

That action targets Phone and PC passthrough: The phone can use its voice VLAN while untagged PC traffic follows the data VLAN. It does not directly resolve the stated LLDP-MED discovery disabled requirement.

C:

That action targets Voice VLAN separation: Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure. It does not directly resolve the stated LLDP-MED discovery disabled requirement.

Question 646

A Junos network engineer takes this step: Enable supported LLDP and LLDP-MED functionality for the voice access port. Which outcome most directly follows?

  1. Voice endpoint network policies can be announced to compatible phones.
  2. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.
  3. The phone can use its voice VLAN while untagged PC traffic follows the data VLAN.
  4. The engineer can verify device discovery and the voice policy offered on the port.

Explanation

Correct Answer

A:

This is the direct result of the LLDP-MED discovery disabled decision: Voice endpoint network policies can be announced to compatible phones.

Incorrect Answers

B:

This outcome is associated with Voice VLAN separation (Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.), not the specified action.

C:

This outcome is associated with Phone and PC passthrough (Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.), not the specified action.

D:

This outcome is associated with LLDP neighbor inspection (Inspect LLDP neighbor detail and advertised LLDP-MED policy information.), not the specified action.

Question 647

An IP phone expects automatic switch voice policy but the access port has LLDP-MED advertisement disabled. A colleague instead suggests: Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports. Which corrective approach most directly addresses the original issue?

  1. Inspect LLDP neighbor detail and advertised LLDP-MED policy information.
  2. Enable supported LLDP and LLDP-MED functionality for the voice access port.
  3. Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.
  4. Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.

Explanation

Correct Answer

B:

This corrective choice addresses LLDP-MED discovery disabled. Voice endpoint network policies can be announced to compatible phones.

Incorrect Answers

A:

That alternative applies to LLDP neighbor inspection instead. The engineer can verify device discovery and the voice policy offered on the port.

C:

That alternative applies to Phone and PC passthrough instead. The phone can use its voice VLAN while untagged PC traffic follows the data VLAN.

D:

That alternative applies to Voice VLAN separation instead. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

Question 648

An enterprise network designer recommends: Enable supported LLDP and LLDP-MED functionality for the voice access port. Which situation most clearly calls for this action?

  1. A desk phone sits between the wall switch and a computer; voice is tagged but the computer sends ordinary untagged traffic.
  2. Employee PCs and VoIP phones share an office switch but voice packets need their own logical broadcast domain.
  3. An IP phone expects automatic switch voice policy but the access port has LLDP-MED advertisement disabled.
  4. A phone is not receiving the expected voice settings and administrators need evidence of whether the switch recognizes it as a neighbor.

Explanation

Correct Answer

C:

This case requires the LLDP-MED discovery disabled action. Voice endpoint network policies can be announced to compatible phones.

Incorrect Answers

A:

This other case would be better matched to Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain. The phone can use its voice VLAN while untagged PC traffic follows the data VLAN.

B:

This other case would be better matched to Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

D:

This other case would be better matched to Inspect LLDP neighbor detail and advertised LLDP-MED policy information. The engineer can verify device discovery and the voice policy offered on the port.

Question 649

Ingress IP packets carry standardized DSCP markings that must map into Junos forwarding classes. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect the applicable CoS classifier and forwarding-class interface statistics.
  2. Apply a supported behavior-aggregate DSCP classifier on the incoming interface.
  3. Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.
  4. Define appropriate CoS forwarding classes and map them to supported distinct queues.

Explanation

Correct Answer

B:

This action addresses DSCP behavior aggregate classifier. The network can classify packets using existing DiffServ codepoint markings.

Incorrect Answers

A:

That action targets Forwarding class inspection: The team can identify whether ingress classification assigned the expected traffic class. It does not directly resolve the stated DSCP behavior aggregate classifier requirement.

C:

That action targets Ingress classifier attachment: Received packets can actually be mapped to forwarding classes by the policy. It does not directly resolve the stated DSCP behavior aggregate classifier requirement.

D:

That action targets Forwarding-class mapping: The traffic categories can be separated for different queue treatment. It does not directly resolve the stated DSCP behavior aggregate classifier requirement.

Question 650

A Junos network engineer takes this step: Apply a supported behavior-aggregate DSCP classifier on the incoming interface. Which outcome most directly follows?

  1. Received packets can actually be mapped to forwarding classes by the policy.
  2. The traffic categories can be separated for different queue treatment.
  3. The network can classify packets using existing DiffServ codepoint markings.
  4. The team can identify whether ingress classification assigned the expected traffic class.

Explanation

Correct Answer

C:

This is the direct result of the DSCP behavior aggregate classifier decision: The network can classify packets using existing DiffServ codepoint markings.

Incorrect Answers

A:

This outcome is associated with Ingress classifier attachment (Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.), not the specified action.

B:

This outcome is associated with Forwarding-class mapping (Define appropriate CoS forwarding classes and map them to supported distinct queues.), not the specified action.

D:

This outcome is associated with Forwarding class inspection (Inspect the applicable CoS classifier and forwarding-class interface statistics.), not the specified action.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests