How should I use these IP Telephony Features practice questions?

Read each scenario carefully and choose your answer before revealing the explanation. Then check why your choice was right or wrong. Repeat until the reasoning feels automatic.

Can I practise just IP Telephony Features questions in a focused session?

Yes — use the session launcher on this page to start a 10-, 20-, 30- or 50-question session drawn entirely from the IP Telephony Features domain.

JNCIP-ENT · topic practice

IP Telephony Features practice questions

This domain covers IP telephony support on Juniper EX Series switches, focusing on Power over Ethernet delivery, power budget allocation, and LLDP-MED voice VLAN signaling. Questions present switch scenarios with IP phones and ask you to select PoE management modes, interpret show poe output, troubleshoot power faults, and identify LLDP-MED capabilities.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Editorial oversight:Johnson Ajibi· MSc IT Security, IEEE Senior Member

20 questionsDomain: IP Telephony Features

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What the exam tests

What to know about IP Telephony Features

Be able to choose the correct PoE management mode for a stated allocation requirement, read show poe interface output, and troubleshoot a phone that fails to power up. The key is matching class-based versus consumption-based allocation to what the scenario actually asks for.

Configuring PoE management modes on EX switches, including class-based versus consumption-based power allocation for IP phones

Using show poe interface and related operational commands to verify power status, allocated watts, and detect hardware errors

Understanding LLDP-MED behavior on Junos EX Series, including voice VLAN advertisement and endpoint discovery

Applying PoE+ 802.3at requirements and power budget calculations when deploying phones on EX4300 and EX4600 platforms

Watch out for

Common IP Telephony Features exam traps

▸Confusing class-based allocation, which reserves power by detected class, with consumption-based allocation that meters actual draw; the question wording determines the correct mode.
▸Assuming LLDP-MED automatically provisions voice VLANs without confirming the feature is enabled on the correct interface and that the phone supports the advertised TLVs.
▸Treating a 'Hardware error' PoE status as a configuration problem instead of checking physical cabling, port damage, or powered-device faults first.

Practice set

IP Telephony Features questions

20 questions · select your answer, then reveal the explanation

Question 1hardmultiple choice

Read the full IP Telephony Features explanation →

An administrator notices that an EX4300 switch is supplying power using LLDP-MED power negotiation, but the IP phone is drawing more power than the initial hardware class allows. Where would you check the advertised LLDP-MED TLV power value received from the phone?

Trap 1: show system lldp-med power-statistics

system lldp-med power-statistics is not a valid operational command.

Trap 2: show poe interface ge-0/0/10 lldp-negotiation

This command syntax does not exist in Junos OS.

Trap 3: show ethernet-switching interfaces lldp ge-0/0/10

Ethernet-switching does not house LLDP operational command outputs.

Study all IP Telephony Features common traps →

A
show system lldp-med power-statistics
Why it fails: system lldp-med power-statistics is not a valid operational command.
B
show poe interface ge-0/0/10 lldp-negotiation
Why it fails: This command syntax does not exist in Junos OS.
C
show lldp neighbor interface ge-0/0/10 detail
The detail variant of 'show lldp neighbor interface' decodes received LLDP-MED TLVs, including the extended power-via-MDI value the phone advertises. This exposes the actual requested wattage, revealing why the device draws more than its initial hardware class permits.
D
show ethernet-switching interfaces lldp ge-0/0/10
Why it fails: Ethernet-switching does not house LLDP operational command outputs.

IP Telephony Features practice questions

What to know about IP Telephony Features

Common IP Telephony Features exam traps

IP Telephony Features questions

An administrator notices that an EX4300 switch is supplying power using LLDP-MED power negotiation, but the IP phone is drawing more power than the initial hardware class allows. Where would you check the advertised LLDP-MED TLV power value received from the phone?

Which command allows you to verify the real-time PoE power consumption, allocated wattage, and operational status of all interfaces on an EX Series switch?

You are configuring a voice VLAN on an EX Series switch access port where an IP phone is connected in series with a PC. Which configuration is required on the switch interface to handle both tagged voice traffic and untagged data traffic?

What is the default behavior of an EX Series switch when an LLDP-MED capable IP phone connects and requests a network policy for voice VLAN?

An administrator needs to enable LLDP globally on an EX Series switch running Junos OS to support IP phones. Which command accomplishes this task?

Which command displays the global status, TLV counters, and operational state of LLDP on an EX Series switch?

You are configuring voice VLANs on an EX2300 switch. You want to ensure that untagged frames entering the interface are placed into the data VLAN, while frames generated by the attached IP phone are tagged with VLAN 50. Which CLI configuration snippet correctly achieves this?

You want to configure LLDP-MED to advertise a specific voice VLAN (VLAN ID 200) with a DSCP value of 46 to all connected IP phones across all switch ports. Which configuration hierarchy is used to define this global network policy in Junos OS?

Which command is used to view LLDP-MED specific neighbor details, including device type, capabilities, and network policies on an EX Series switch?

An enterprise network uses IP phones that require LLDP-MED to receive voice VLAN information. However, security policy dictates that LLDP should be disabled on all user-facing access ports that do not have IP phones. Which configuration statement disables LLDP on a per-interface basis?

You are configuring an EX3400 switch to support IP phones that require power redundancy. Which PoE management feature allows the switch to allocate power based on available PSU capacity while reserving a safety margin?

Which Junos command displays the LLDP neighbor information specifically for a single interface, such as ge-0/0/1?

An administrator is configuring LLDP-MED on an EX Series switch for a new deployment of IP phones. Which TWO configuration steps are required to properly advertise network policies to these endpoints? (Choose two.)

An administrator wants to verify LLDP and LLDP-MED operation on an EX Series switch. Which THREE operational commands provide relevant diagnostic information? (Choose three.)

Which THREE conditions must be met for an EX Series switch to successfully supply PoE power to an attached IP phone? (Choose three.)

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