350-501 Automation and Quality of Service Practice Question
Which TWO actions are required to implement QoS trust boundaries correctly in a service provider network?
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
✓
Configure classification at the edge
Classification must be performed at the network edge to establish the trust boundary and enforce QoS policies. Option D is correct because setting trust to CoS on access ports allows the switch to accept the priority markings from trusted devices like IP phones or routers, which is essential for maintaining the trust boundary. Option B is incorrect because Auto QoS is not a mandatory requirement for trust boundaries; it is an optional feature that automates QoS configuration. Option C is incorrect because shaping is applied at customer premises and is not directly related to trust boundary implementation. Option E is incorrect because MPLS EXP bits are used for core marking, not for configuring trust boundaries at the access layer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure classification at the edge
Why this is correct
Classification marks packets at the edge, defining the trust boundary.
- ✗
Enable auto QoS on all interfaces
Why it's wrong here
Auto QoS is a tool, not a requirement for trust boundary implementation.
- ✗
Apply shaping at customer premises
Why it's wrong here
Shaping controls traffic rate, not trust boundary.
- ✓
Set trust to CoS on access ports
Why this is correct
Setting trust on access ports is a fundamental step to establish trust boundary at the edge.
- ✗
Use MPLS EXP bits for core marking
Why it's wrong here
MPLS EXP marks are for core propagation, not establishing trust boundary.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco 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 350-501 exam.