Most Recent Nokia 4A0-115 Exam Questions & Answers

Prepare for the Nokia Ethernet Virtual Private Network Services exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

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The questions for 4A0-115 were last updated on Jan 17, 2025.

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Question No. 1

In the exhibit, PE2 is receiving an EVPN auto-discovery (A-D) route from PEI. Based on the output, which of the following statements is FALSE?

AThis route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.

BThis route indicates that the EVPN service configured on PEI is multi-homed.

CThis route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.

DThis route indicates that the EVPN service is configured on PEI with a service MTU of 1514.

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Correct Answer: D

This route indicates that the EVPN service is configured on PE1 with a service MTU of 1500, not 1514. The service MTU is indicated by the MPLS label value in hexadecimal format. The MPLS label value of 0x05DC corresponds to a decimal value of 1500.

Question No. 2

Which of the following statements about EVPN auto-discovery per Ethernet segment (A-D per ES) routes is TRUE?

AThe updates include an Ethernet segment identifier label that is used in loop prevention.

BThe updates advertise the Ethernet segment availability in a given EVPN service.

CThe updates include an MPLS label that is set to a non-zero value.

DThe updates include an Ethernet tag ID that is set to zero.

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Correct Answer: D

EVPN auto-discovery per Ethernet segment (A-D per ES) routes do not include an Ethernet tag ID that is set to zero.The Ethernet tag ID is set to a non-zero value that identifies the EVPN service instance1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question No. 3

Examine the exhibit.

Which of the following statements about the operation of EVPN VPWS 4 is FALSE?

APEI brings the SAP in VPWS 4 operationally down.

BPE3 sets the P flag in its advertised A-D per EVI route to I.

CPE2 receives a single A-D per EVI route. The route is originated from PE3.

DPE2 receives two A-D per ES routes: one from PEI and another from PE3.

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Correct Answer: B

PE3 does not set the P flag in its advertised A-D per EVI route to 1. PE3 sets the P flag to 0, indicating that it is not the DF for EVI 20.PE1 sets the P flag to 1, indicating that it is the DF for EVI 201.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question No. 4

In the exhibit, the default algorithm is used to elect the designated forwarder (DF) on ESI 1. Which PE is elected as DF for VPLS 10?

APEI

BPE2

CPE3

DPE4

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Correct Answer: B

PE2 is elected as DF for VPLS 10. The default algorithm uses the lowest IP address of the PEs attached to the same Ethernet segment as the tie-breaker criterion. PE2 has the lowest IP address among PE1, PE2, and PE3.

Question No. 5

Based on the exhibit below, which of the following statements is FALSE?

When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.

AThe MPLS label 524284 presented indicates the service label value that the neighbor 10.10.10.2 uses to forward BUM traffic to PEI.

BWhen forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.

CThe IMET route is imported by a local VPLS configured with a route-target value of 65100:10.

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Correct Answer: A

When forwarding BUM traffic, the local PE does not replicate the traffic and send it as unicast to the advertising neighbor. Instead, the local PE uses an MPLS transport tunnel towards the advertising neighbor and sends the traffic with an MPLS label that indicates the service.

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