Nokia 4A0-115 Exam Practice Test Instant Access

Question 1

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 2

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 3

Based upon the exhibit, which of the following statements is FALSE?

AVPLS 10 must be configured with two BGP instances on PE3 and PE4.

BOn PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.

COn PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.

DA BGP export policy is required on PE3 and PE4 to ensure that IMET routes originated with VXLAN encapsulation are not advertised to the peer across the core network.

Answer : A

VPLS 10 does not need to be configured with two BGP instances on PE3 and PE4. VPLS 10 can be configured with a single BGP instance that supports both VXLAN and MPLS encapsulations.

Question 4

Which of the following statements about multi-homing for a Layer-2 service is TRUE?

AIn the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.

BIn the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.

CIn the all-active mode, all PES attached to a CE can forward traffic to and from the CE.

DThe Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.

Answer : C

In the all-active mode, all PEs attached to a CE can forward traffic to and from the CE. This provides load balancing and redundancy for the CE.The CE does not require a LAG to be configured between the CE and all attached PEs1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 5

Based upon the exhibit, which of the following statements is FALSE?

APEI populates this information into the local VPLS FDB.

BNeighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.

CNeighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.

DPEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.

Answer : D

PE1 does not use VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3. PE1 uses MPLS tunnels to reach these neighbors, as indicated by the MPLS label values in the output.

Question 6

In the exhibit, VPWS 4 enables communications between CEI and CE2. Which of the following statements regarding the operation of VPWS 4 is FALSE?

APEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally

BPE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.

CPEI and PE3 exchange their service labels using A-D per EVI routes.

DPE3 and PE4 exchange their service labels over an established targeted LDP session.

Answer : C

PE1 and PE3 do not exchange their service labels using A-D per EVI routes.PE1 and PE3 exchange their service labels using MAC routes, which are advertised when their local ACs become operationally UP1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 7

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

AA PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.

BA PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.

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

DThe updates are used to discover all the PES associated with an Ethernet segment.

Answer : B

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.

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