350-501 Architecture Practice Question
In EVPN, what is the purpose of Ethernet Segment Identifier (ESI)?
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
✓
To uniquely identify an Ethernet segment for multi-homing
ESI is used to identify a multi-homed site or Ethernet segment for all-active or single-active redundancy and to prevent 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.
- ✗
To identify a VXLAN tunnel
Why it's wrong here
VXLAN is different; ESI is for multi-homing.
- ✗
To assign a VLAN ID to a customer
Why it's wrong here
VLAN ID is separate.
- ✗
To enable MPLS label distribution
Why it's wrong here
Label distribution is via MP-BGP.
- ✓
To uniquely identify an Ethernet segment for multi-homing
Why this is correct
ESI is key for multi-homing in EVPN.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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