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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 63

Question 620

An enterprise network designer recommends: Inspect Junos PoE port power consumption, allocation and fault status. Which situation most clearly calls for this action?

  1. A switch with many access points and desk phones reports insufficient available PoE power when another phone starts.
  2. An IP phone requests a higher power allocation than the port's configured or supported class permits.
  3. A newly installed desk phone has an Ethernet data link but cannot start because its power adapter is missing.
  4. The help desk cannot explain why a PoE phone reboots during peak power usage on a full switch.

Explanation

Correct Answer

D:

This case requires the PoE monitoring action. Power budget or fault evidence can distinguish electrical delivery problems from voice signaling faults.

Incorrect Answers

A:

This other case would be better matched to Calculate the aggregate power demand against the available switch or module PoE budget. The design can identify whether the hardware has capacity for the full set of powered devices.

B:

This other case would be better matched to Align the port's power allocation and supported PoE class with the phone's requirement. The powered device can negotiate the level of electrical power it needs within switch limits.

C:

This other case would be better matched to Provide supported PoE power from a capable switch port or an approved injector. The endpoint can receive both network connectivity and electrical power through the Ethernet path.

Question 621

A network refresh adds higher-power wireless devices beside many low-power handsets on a limited electrical budget. Which Junos networking action or protocol decision best addresses this requirement?

  1. Enable the appropriate power-over-Ethernet function on the supported access port.
  2. Reassess device-by-device PoE requirements before choosing switch hardware and power supplies.
  3. Provide supported PoE power from a capable switch port or an approved injector.
  4. Align the port's power allocation and supported PoE class with the phone's requirement.

Explanation

Correct Answer

B:

This action addresses PoE capacity planning. The upgraded switch capacity can be sized to meet worst-case supported device demand.

Incorrect Answers

A:

That action targets PoE port disabled: The port can supply power to a connected compatible powered device. It does not directly resolve the stated PoE capacity planning requirement.

C:

That action targets PoE electrical power: The endpoint can receive both network connectivity and electrical power through the Ethernet path. It does not directly resolve the stated PoE capacity planning requirement.

D:

That action targets PoE class negotiation: The powered device can negotiate the level of electrical power it needs within switch limits. It does not directly resolve the stated PoE capacity planning requirement.

Question 622

A Junos network engineer takes this step: Reassess device-by-device PoE requirements before choosing switch hardware and power supplies. Which outcome most directly follows?

  1. The port can supply power to a connected compatible powered device.
  2. The endpoint can receive both network connectivity and electrical power through the Ethernet path.
  3. The upgraded switch capacity can be sized to meet worst-case supported device demand.
  4. The powered device can negotiate the level of electrical power it needs within switch limits.

Explanation

Correct Answer

C:

This is the direct result of the PoE capacity planning decision: The upgraded switch capacity can be sized to meet worst-case supported device demand.

Incorrect Answers

A:

This outcome is associated with PoE port disabled (Enable the appropriate power-over-Ethernet function on the supported access port.), not the specified action.

B:

This outcome is associated with PoE electrical power (Provide supported PoE power from a capable switch port or an approved injector.), not the specified action.

D:

This outcome is associated with PoE class negotiation (Align the port's power allocation and supported PoE class with the phone's requirement.), not the specified action.

Question 623

A network refresh adds higher-power wireless devices beside many low-power handsets on a limited electrical budget. A colleague instead suggests: Align the port's power allocation and supported PoE class with the phone's requirement. Which corrective approach most directly addresses the original issue?

  1. Provide supported PoE power from a capable switch port or an approved injector.
  2. Align the port's power allocation and supported PoE class with the phone's requirement.
  3. Enable the appropriate power-over-Ethernet function on the supported access port.
  4. Reassess device-by-device PoE requirements before choosing switch hardware and power supplies.

Explanation

Correct Answer

D:

This corrective choice addresses PoE capacity planning. The upgraded switch capacity can be sized to meet worst-case supported device demand.

Incorrect Answers

A:

That alternative applies to PoE electrical power instead. The endpoint can receive both network connectivity and electrical power through the Ethernet path.

B:

That alternative applies to PoE class negotiation instead. The powered device can negotiate the level of electrical power it needs within switch limits.

C:

That alternative applies to PoE port disabled instead. The port can supply power to a connected compatible powered device.

Question 624

An enterprise network designer recommends: Reassess device-by-device PoE requirements before choosing switch hardware and power supplies. Which situation most clearly calls for this action?

  1. A network refresh adds higher-power wireless devices beside many low-power handsets on a limited electrical budget.
  2. An IP phone requests a higher power allocation than the port's configured or supported class permits.
  3. A phone works on another switch interface but the target port reports its PoE delivery as administratively off.
  4. A newly installed desk phone has an Ethernet data link but cannot start because its power adapter is missing.

Explanation

Correct Answer

A:

This case requires the PoE capacity planning action. The upgraded switch capacity can be sized to meet worst-case supported device demand.

Incorrect Answers

B:

This other case would be better matched to Align the port's power allocation and supported PoE class with the phone's requirement. The powered device can negotiate the level of electrical power it needs within switch limits.

C:

This other case would be better matched to Enable the appropriate power-over-Ethernet function on the supported access port. The port can supply power to a connected compatible powered device.

D:

This other case would be better matched to Provide supported PoE power from a capable switch port or an approved injector. The endpoint can receive both network connectivity and electrical power through the Ethernet path.

Question 625

A new IP phone should learn its designated voice VLAN and applicable network policy from the Ethernet switch automatically. 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. Inspect LLDP neighbor detail and advertised LLDP-MED policy information.
  3. Advertise the supported LLDP-MED network policy toward the phone.
  4. Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.

Explanation

Correct Answer

C:

This action addresses LLDP-MED network policy. The phone can discover the intended voice VLAN information from the access switch.

Incorrect Answers

A:

That action targets Voice tag mismatch: Tagged voice frames can enter the intended voice broadcast domain instead of being discarded. It does not directly resolve the stated LLDP-MED network policy requirement.

B:

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 network policy requirement.

D:

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 network policy requirement.

Question 626

A Junos network engineer takes this step: Advertise the supported LLDP-MED network policy toward the phone. Which outcome most directly follows?

  1. The engineer can verify device discovery and the voice policy offered on the port.
  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. The phone can discover the intended voice VLAN information from the access switch.

Explanation

Correct Answer

D:

This is the direct result of the LLDP-MED network policy decision: The phone can discover the intended voice VLAN information from the access switch.

Incorrect Answers

A:

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

B:

This outcome is associated with Voice tag mismatch (Align the advertised and permitted voice VLAN identifier across the phone and switching port.), 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.

Question 627

A new IP phone should learn its designated voice VLAN and applicable network policy from the Ethernet switch automatically. A colleague instead suggests: Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain. Which corrective approach most directly addresses the original issue?

  1. Advertise the supported LLDP-MED network policy toward the phone.
  2. Inspect LLDP neighbor detail and advertised LLDP-MED policy information.
  3. Use the supported access-port data VLAN plus tagged voice VLAN design for the phone-PC chain.
  4. Align the advertised and permitted voice VLAN identifier across the phone and switching port.

Explanation

Correct Answer

A:

This corrective choice addresses LLDP-MED network policy. The phone can discover the intended voice VLAN information from the access switch.

Incorrect Answers

B:

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

Question 628

An enterprise network designer recommends: Advertise the supported LLDP-MED network policy toward the phone. Which situation most clearly calls for this action?

  1. A phone is not receiving the expected voice settings and administrators need evidence of whether the switch recognizes it as a neighbor.
  2. A new IP phone should learn its designated voice VLAN and applicable network policy from the Ethernet switch automatically.
  3. A desk phone sits between the wall switch and a computer; voice is tagged but the computer sends ordinary untagged traffic.
  4. A phone tags frames for voice VLAN 210, but the upstream switch accepts only VLAN 200 as the voice VLAN.

Explanation

Correct Answer

B:

This case requires the LLDP-MED network policy action. The phone can discover the intended voice VLAN information from the access switch.

Incorrect Answers

A:

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.

C:

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.

D:

This other case would be better matched to Align the advertised and permitted voice VLAN identifier across the phone and switching port. Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.

Question 629

Employee PCs and VoIP phones share an office switch but voice packets need their own logical broadcast domain. Which Junos networking action or protocol decision best addresses this requirement?

  1. Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports.
  2. Enable supported LLDP and LLDP-MED functionality for the voice access port.
  3. Align the advertised and permitted voice VLAN identifier across the phone and switching port.
  4. Inspect LLDP neighbor detail and advertised LLDP-MED policy information.

Explanation

Correct Answer

A:

This action addresses Voice VLAN separation. Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

Incorrect Answers

B:

That action targets LLDP-MED discovery disabled: Voice endpoint network policies can be announced to compatible phones. It does not directly resolve the stated Voice VLAN separation requirement.

C:

That action targets Voice tag mismatch: Tagged voice frames can enter the intended voice broadcast domain instead of being discarded. It does not directly resolve the stated Voice VLAN separation requirement.

D:

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 Voice VLAN separation requirement.

Question 630

A Junos network engineer takes this step: Configure a dedicated voice VLAN with suitable trunk or access semantics for the phone ports. 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 engineer can verify device discovery and the voice policy offered on the port.
  4. Tagged voice frames can enter the intended voice broadcast domain instead of being discarded.

Explanation

Correct Answer

B:

This is the direct result of the Voice VLAN separation decision: Voice and data traffic can be separated into distinct VLANs on the same switching infrastructure.

Incorrect Answers

A:

This outcome is associated with LLDP-MED discovery disabled (Enable supported LLDP and LLDP-MED functionality for the voice access port.), not the specified action.

C:

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

D:

This outcome is associated with Voice tag mismatch (Align the advertised and permitted voice VLAN identifier across the phone and switching port.), not the specified action.

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