JNCIP-ENT IP Telephony Features Practice Question
An administrator configures PoE management mode on an EX4300 switch to 'consumption'. An IP phone connects, but before booting up completely, the switch denies power. Upon investigation, you find that the switch's static power reservation table is maxed out. What is the reason for this behavior in consumption mode?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Consumption mode still requires an initial allocation based on maximum class rating until LLDP-MED or CDP successfully negotiates the lower actual consumption value.
Even in consumption mode, Junos initially allocates power based on class or a default maximum until the device negotiates its actual consumption via LLDP-MED or CDP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Consumption mode still requires an initial allocation based on maximum class rating until LLDP-MED or CDP successfully negotiates the lower actual consumption value.
Why this is correct
The switch must initially reserve enough power based on the hardware class until runtime negotiation reduces the allocation.
- ✗
Consumption mode only works with non-PoE+ devices.
Why it's wrong here
Consumption mode supports both 802.3af and 802.3at devices.
- ✗
Consumption mode requires manual CLI power limits for every single port.
Why it's wrong here
Consumption mode automates power tracking based on actual usage once active.
- ✗
Consumption mode disables all dynamic power allocations permanently.
Why it's wrong here
Consumption mode uses dynamic allocation based on actual measured draw after boot.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIP-ENT practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIP-ENT exam.