Nokia 4A0-115 Exam Questions Instant Access

Question 1

Examine the exhibit.

Which of the following statements about the EVPN routes exchanged for EVPN VPWS 2 is TRUE?

APEI advertises an A-D per EVI route that includes a tag ID set to 40.

BPEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.

CPE2 advertises an A-D per EVI route that includes a P flag set to I.

DAll PES advertise a MAC route that includes a non-zero MPLS label.

Answer : D

All PEs do not advertise a MAC route that includes a non-zero MPLS label. Only PE1 advertises a MAC route that includes a non-zero MPLS label, which is used by PE2 to forward traffic to PE1.PE2 and PE3 do not advertise any MAC routes for VPWS 21.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 2

Examine the exhibit.

Which of the following configuration conditions is required for the proper operation of EVPN VPWS 2?

AThe local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.

BThe remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.

CThe local AC tag ID and the remote AC tag ID configured on PE2 must match.

DThe local AC tag ID configured on PEI must match the local AC tag ID configured on PE3.

Answer : A

The local AC tag ID configured on PE2 must match the local AC tag ID configured on PE1. This ensures that the tag IDs are consistent across both ends of the VPWS service.The remote AC tag ID configured on PE2 does not need to match the remote AC tag ID configured on PE3, as long as they are unique within each PE1.

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

In the exhibit,

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

ACEI generates an update message to PEI withdrawing its MAC.

BPEI generates an update message to remote PES identifying the new location of CEI.

CPE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.

DPE3 waits to receive a data packet from CEI to update its FDB entry for MACI.

Answer : C

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.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

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

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 7

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

AEthernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.

BES routes provide the ESI label required to support the split-horizon mechanism.

CAuto-discovery (A-D) routes are imported by all PES participating in the EVPN service.

DA-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.

Answer : A

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.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Nokia Ethernet Virtual Private Network Services 4A0-115 Exam Questions