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.

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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

Practise Juniper Networks Enterprise Routing and Switching, Professional (JNCIP-ENT, JN0-650) (JNCIP-ENT) IP Telephony Features practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

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.

Reviewed byJohnson Ajibi· MSc IT Security

20 questionsDomain: IP Telephony Features

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What the exam tests

What to know about IP Telephony Features

IP Telephony Features questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common IP Telephony Features exam traps

▸Answering from memory before reading the full scenario.
▸Missing a constraint such as cost, availability, security, scope or command context.
▸Choosing a broad answer when the question asks for the most specific fix.
▸Ignoring why the wrong options are tempting.

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 wrong: system lldp-med power-statistics is not a valid operational command.
B
show poe interface ge-0/0/10 lldp-negotiation
Why wrong: This command syntax does not exist in Junos OS.
C
show lldp neighbor interface ge-0/0/10 detail
The detail modifier displays all received TLVs, including LLDP-MED power management details.
D
show ethernet-switching interfaces lldp ge-0/0/10
Why wrong: 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?

You are troubleshooting an IP phone that is failing to discover its voice VLAN via LLDP-MED on an EX4600 switch. You issue the show lldp interface command and see that LLDP is transmitting properly, but the phone reports no voice VLAN TLV received. What is the most likely cause of this issue?

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?

An administrator implements LLDP-MED on an EX Series switch network. To prevent unauthorized devices from masquerading as IP phones and requesting voice VLAN access, which feature should be combined with LLDP-MED?

You notice that an EX4300 switch power budget calculation is set to use 'class-based' allocation. What does this mean regarding how power is reserved for connected IP phones?

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?

An IP phone connected to an EX4600 switch fails to power up. You run show poe interface ge-0/0/1 and find the status displays 'Hardware error'. What is the most appropriate troubleshooting step?

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?

What does the LLDP-MED acronym stand for in the context of enterprise networking and IP telephony?

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?

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