Question 1

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 2

Examine the exhibit.

Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?

AConfigure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.

BConfigure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.

CConfigure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.

DConfigure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.

Answer : C

The advertisement of IP-Prefix routes is not required to enable Layer-2 communication between CE1 and CE2. IP-Prefix routes are used to enable Layer-3 communication between different subnets in an EVPN-IRB service.For Layer-2 communication, only MAC/IP routes are required2.

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

Question 3

Examine the exhibit.

Which of the following statements about the operation of VPLS 20 is TRUE?

AThe flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.

BPE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.

CPE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.

DPEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.

Answer : D

PE1 does not advertise a MAC route for MAC-01 when its VPLS 20's SAP becomes operationally UP.PE1 advertises an EVPN MAC/IP route for MAC-01, which includes the IP address of Host 1 and the ESI of the Ethernet segment1.

Verified Reference:Ethernet Virtual Private Networks (EVPNs)

Question 4

In the exhibit, the EVPN-IRB is configured to use the interface-ful unnumbered model. Which of the following statements regarding the route advertisement is FALSE?

APEI advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE3. The BGP update includes MAC-OI as on overlay index.

BPEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.

CPE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.

DPE4 advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. The BGP update includes MAC-04 as an overlay index.

Answer : D

PE4 does not advertise an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2.PE4 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE2, which includes the MPLS service label of VPRN 152.

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

Question 5

In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements is FALSE?

AAn MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.

BAn MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.

COn PE3, the routing table for VPRN 15 contains an entry for 10.10.1.0/24. This entry is resolved to MAC-OI as an overlay index.

DOn PE3, the routing table for VPRN 15 contains an entry for 10.10.4.0/24. This entry is resolved using a transport tunnel towards PE

Answer : C

On PE3, the routing table for VPRN 15 does not contain an entry for 10.10.1.0/24.This entry is not needed because Host 1 is in the same subnet as the SBD IRB interface on PE3, and PE3 can reach Host 1 using its MAC address2.

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

Free Practice Questions for Nokia 4A0-115 Exam

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