350-501 Architecture Practice Question
An SP deploys EVPN to provide L2VPN services with multi-homing. The customer CE is dual-homed to two different PE routers. Which EVPN mechanism ensures that only one PE forwards traffic to the CE for a given Ethernet segment, preventing loops?
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
✓
Designated Forwarder election based on ESI
Ethernet Segment Identifier (ESI) and designated forwarder (DF) election in EVPN ensure that only one PE forwards traffic to the CE for a given Ethernet segment, preventing loops.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BGP Route Reflector
Why it's wrong here
Route reflectors help with BGP scaling, not loop prevention.
- ✗
MAC learning via data plane
Why it's wrong here
MAC learning is separate from DF election.
- ✗
Split horizon groups
Why it's wrong here
Split horizon is a general loop prevention in VPLS, not specific to EVPN multi-homing.
- ✓
Designated Forwarder election based on ESI
Why this is correct
DF election ensures only one PE forwards BUM traffic to the CE.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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