Nokia 4A0-115 Exam Questions Instant Access

Question 1

A. Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?

BThe PE has proxy-ARP and dynamic-populate enabled for the VPLS.

CThe proxy-ARP table is populated by snooping IP packets received from remote PEs.

DWhen the PE learns a local host IP address, it adds an entry into its proxy-ARP table.

EThe PE advertises a MAC/IP route that includes the MAC and IP address of a local host.

Answer : C

When the PE learns a local host IP address, it does not add an entry into its proxy-ARP table. The proxy-ARP table is populated by snooping IP packets received from remote PEs. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.

Question 2

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 3

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 4

Which of the following statements about PE-to-PE MAC address advertisement is FALSE?

AThe service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.

BRoute targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.

CA PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.

DA PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.

Answer : B

Route targets are not used to uniquely identify routes between EVIs in the case of MAC address overlaps. Route targets are used to control the import and export of routes between different EVIs or VRFs.The service distinguisher (label or VNI) is used to uniquely identify each service1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 5

Based upon the exhibit,

which of the following statements about the forwarding of BUM traffic is FALSE?

APE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.

BPE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.

CPEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.

DPE2 decapsulates the packets received from PE3 and forwards the frames to CE2.

Answer : B

PE3 does not add an ESI label to packets forwarded to PE1 because PE1 is connected to the same Ethernet segment.PE3 adds an ESI label only to packets forwarded to PEs that are not connected to the same Ethernet segment, such as PE21.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 6

In the exhibit, the interface-less forwarding model is used for the Layer-3 EVPN service. Which of the following statements about traffic forwarding from Host 1 to Host 2 is FALSE?

APEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.

BPEI encapsulates the packet with two labels: an outer transport label and an inner service label.

CPE2 inspects the service label and determines that it is associated with RVPLS 2.

DPE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.

Answer : B

PE1 does not encapsulate the packet with two labels: an outer transport label and an inner service label.PE1 encapsulates the packet with three labels: an outer transport label, a service label associated with VPRN 11, and a service label associated with RVPLS 11.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 7

Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?

AIt is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.

BIt is applicable to EVPN VPLS services.

CIt specifies the service maximum transmission unit (MTU).

DIt specifies a P flag that indicates whether the advertising PE is a primary PE.

Answer : B

The EVPN Layer 2 Attributes extended community is not applicable to EVPN VPLS services.It is applicable to EVPN VPWS services, where it carries information such as the tag ID and the service MTU1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

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