350-501 MPLS and Segment Routing Practice Question
In EVPN multi-homing with all-active mode, which mechanism is used to elect a designated forwarder (DF) for broadcast, unknown unicast, and multicast (BUM) traffic on a given Ethernet segment?
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
✓
DF election via ESI label and route type 4
The DF election is performed using a deterministic algorithm based on the ESI and the list of PEs, with the lowest IP address becoming DF.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Load balancing via MLAG
Why it's wrong here
MLAG is a proprietary mechanism.
- ✗
ES-IS protocol
Why it's wrong here
Not used for DF election.
- ✓
DF election via ESI label and route type 4
Why this is correct
Route type 4 (Ethernet Segment route) is used to announce ESI and perform DF election.
- ✗
MSTP
Why it's wrong here
MSTP is for spanning tree.
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JA
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.