350-501 MPLS and Segment Routing Practice Question
An operator is deploying EVPN-VPWS over an MPLS network. Which component uniquely identifies a multihomed Ethernet segment in EVPN?
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
✓
Ethernet Segment Identifier (ESI)
The Ethernet Segment Identifier (ESI) is a unique identifier for a multihomed segment. It is used for DF election, aliasing, and split-horizon.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ethernet Tag ID
Why it's wrong here
Ethernet Tag ID identifies a VLAN, not the segment.
- ✓
Ethernet Segment Identifier (ESI)
Why this is correct
Correct: ESI uniquely identifies the segment.
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Route Distinguisher (RD)
Why it's wrong here
RD is used to distinguish VPN routes.
- ✗
MPLS Label
Why it's wrong here
MPLS label is used for forwarding, not segment identification.
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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.