Nokia 4A0-115 Exam Practice Test Instant Access

Question 1

Which of the following statements about the EVPN data plane is FALSE?

AEVPN allows a service provider to deliver multiple services over a single core network.

BThe customer data is encapsulated and then tunneled between the PE routers.

CEVPN-MPLS encapsulated data has a label that uniquely identifies each service.

DEVPN-MPLS provides services over a simple IP network.

Answer : D

EVPN-MPLS provides services over an MPLS network, not a simple IP network.The customer data is encapsulated with an MPLS label that identifies the service and then tunneled between the PE routers using MPLS LSPs1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 2

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.

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.

Question 3

Examine the exhibit.

Which of the following actions is performed by PEI after it receives a BUM packet from CEI?

APEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.

BPEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.

CPEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.

DPEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.

Answer : C

PE1 sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2. The ESI label is used to implement the split-horizon mechanism and prevent traffic duplication. The packet sent to PE3 does not need an ESI label because PE3 is connected to the same Ethernet segment as PE1.

Question 4

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?

APEI

BPE2

CPE3

DPE4

Answer : C

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 5

Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?

AAuto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only

BMAC/IP routes, A-D per EVI routes, and A-D per ES routes

CA-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes

DA-D per EVI routes and ES routes only

Answer : C

A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes are exchanged to support the operation of a multi-homed EVPN VPWS. These routes are used to discover all PEs associated with an Ethernet segment, indicate the redundancy mode of the Ethernet segment, and elect the designated forwarder for each service.

Question 6

Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?

AEVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.

BVPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.

CIntra-subnet traffic is carried over the tunnels provided by the SBD VPLS.

DThe MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.

Answer : C

In the interface-ful model, VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.The MAC/IP routing information is not used to populate the VPRN routing table at the remote PEs, but rather to populate the FDB of the SBD VPLS2.

Verified Reference:Nokia Ethernet Virtual Private Network Services Course | Nokia

Question 7

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.

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.

Nokia Ethernet Virtual Private Network Services 4A0-115 Exam Practice Test