4A0-115 Exam Preparation Material | Nokia Ethernet Virtual Private Network Services

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Prepare for the 4A0-115 Nokia Ethernet Virtual Private Network Services exam with CertQueen's independently developed study resources. Review important concepts, practice scenario-based questions, and use clear explanations to identify areas that require further study.

Question#1

In the exhibit,



MACI moves from PEI to PE2.
Which of the following actions related to this MAC address mobility is performed?

A. CEI generates an update message to PEI withdrawing its MA
B. PEI generates an update message to remote PES identifying the new location of CE
C. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PE
D. PE3 waits to receive a data packet from CEI to update its FDB entry for MAC

Explanation:
PE2 advertises a MAC/IP route for MAC1 with a sequence number higher than that received from PE1. This indicates that MAC1 has moved from PE1 to PE2 and triggers a MAC withdrawal message from PE1 to remote PEs. CE1 does not generate an update message to PE1 withdrawing its MAC, nor does PE1 generate an update message to remote PEs identifying the new location of CE11.
Reference: Ethernet Virtual Private Networks (EVPNs)

Question#2

Which of the following statements about the EVPN route types used to support multi-homing is TRUE?

A. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
B. ES routes provide the ESI label required to support the split-horizon mechanism.
C. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
D. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.

Explanation:
Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment. The redundancy mode can be either single-active or all-active, and it determines how traffic is forwarded to and from a multi-homed CE1.
Reference: Ethernet Virtual Private Networks (EVPNs)

Question#3

In the exhibit, an EVI range is configured and the preference-based algorithm is used to elect the designated forwarder (DF) on ESI 1.
Which PE is elected as DF for VPLS 10?


A. PEI
B. PE2
C. PE3
D. PE4

Explanation:
PE3 is elected as DF for VPLS 10. The preference-based algorithm uses the highest preference value of the PEs attached to the same Ethernet segment as the tie-breaker criterion. PE3 has the highest preference value among PE1, PE2, and PE3.

Question#4

In the exhibit, the interface-ful numbered model is used for the Layer-3 EVPN service.
Which of the following is used as the source MAC address in the packets sent from PEI when forwarding customer traffic to Host 2?


A. MAC-OI
B. MAC-03
C. MAC-04
D. MAC-11

Explanation:
MAC-01 is used as the source MAC address in the packets sent from PE1 when forwarding customer traffic to Host 2. MAC-01 is the MAC address of the SBD IRB interface configured in VPRN 11 on PE12.
Reference: Nokia Ethernet Virtual Private Network Services Course | Nokia

Question#5

Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?

A. A PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.
B. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
C. The updates include an Ethernet tag ID that is set to zero.
D. The updates are used to discover all the PES associated with an Ethernet segment.

Explanation:
A PE does not advertise an A-D per EVI route for each operational service defined on an Ethernet segment. A PE advertises a single A-D per EVI route for all services defined on an Ethernet segment.

Exam Code: 4A0-115
Q & A: 39 Q&As         Updated:  Oct 17,2026

 

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Exam Code: 4A0-115
Q & A: 39 Q&As
Updated:  Oct 17,2026

 

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