Nokia 4A0-D01 Question Answer
Which of the following statements about multi-homing in EVPN is FALSE?
Type 1 Ethernet Auto-Discovery (A-D) EVPN route is used to support EVPN multi-homing.
Type 4 Ethernet Segment (ES) EVPN route is used for designated forwarder (DF) election for an ES.
The ES identifier (ESI) uniquely identifies an ES and it is locally significant for a particular leaf.
The Ethernet Segment (ES) identifies a set of links that connects a host to one or more leafs.
Comprehensive and Detailed Explanation with Exact Extracts:
Option A (TRUE): Type 1 routes enable multi-homing functions.
Extract from Nokia EVPN Multi-Homing Guide:
"Type 1 Ethernet A-D routes signal reachability for an Ethernet Segment (ES) and enable fast convergence/aliasing in multi-homing."
Option B (TRUE): Type 4 routes facilitate DF election.
Extract from Nokia EVPN Fundamentals Guide:
"Type 4 Ethernet Segment routes advertise ESI and VTEP IP to peers for Designated Forwarder (DF) election, which prevents BUM traffic loops."
Option C (FALSE): The ESI is globally unique, not locally significant.
Extract from Nokia SR Linux Configuration Guide (Section: EVPN ESI):
"The ESI must be unique network-wide and consistently configured on all leafs attached to the same multi-homed device. It is not locally significant."
Option D (TRUE): An ES defines the host connectivity model.
"An Ethernet Segment (ES) is a set of links connecting a single host (e.g., server) to one or more leafs for redundancy/load balancing."
TESTED 06 Jul 2025
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