JNCIP-ENT Class OF Service Practice Question
What is the primary function of a behavior aggregate (BA) classifier in Junos CoS?
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
✓
It classifies packets based exclusively on header CoS bits such as DSCP or EXP
A Behavior Aggregate (BA) classifier classifies packets based solely on the CoS bits in the packet header (such as DSCP, EXP, or IEEE 802.1p).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It classifies packets based exclusively on header CoS bits such as DSCP or EXP
Why this is correct
BA classifiers use header bits to assign forwarding classes.
- ✗
It drops packets exceeding a predefined bandwidth rate
Why it's wrong here
That describes a policer.
- ✗
It rewrites VLAN tags on egress interfaces
Why it's wrong here
That describes a rewrite rule.
- ✗
It classifies packets based on Layer 4 port numbers and source IP addresses
Why it's wrong here
That describes a multi-field classifier.
About these practice questions
Courseiva writes every JNCIP-ENT question from scratch — 332 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.