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Nokia 4A0-115 Practice Test - Questions Answers, Page 2

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Examine the exhibit. Which of the following configuration conditions is required for the proper operation of EVPN VPWS 2?
In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements is FALSE?
Based upon the exhibit, how many MAC-VRFs are there?
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?
Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
Which of the following statements about the EVPN data plane is FALSE?
In the exhibit, VPWS 4 enables communications between CEI and CE2. Which of the following statements regarding the operation of VPWS 4 is FALSE?
Examine the exhibit. Which of the following actions is performed by PEI after it receives a BUM packet from CEI?

Question 11

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

A.
PEI populates this information into the local VPLS FDB.
A.
PEI populates this information into the local VPLS FDB.
Answers
B.
Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
B.
Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
Answers
C.
Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
C.
Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
Answers
D.
PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
D.
PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
Answers
Suggested answer: D

Explanation:

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 12

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

A.
The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
A.
The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
Answers
B.
The proxy-ARP table is populated by snooping IP packets received from remote PEs.
B.
The proxy-ARP table is populated by snooping IP packets received from remote PEs.
Answers
C.
When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
C.
When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
Answers
D.
The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
D.
The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
Answers
Suggested answer: C

Explanation:

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 13

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

A.
VPLS 10 must be configured with two BGP instances on PE3 and PE4.
A.
VPLS 10 must be configured with two BGP instances on PE3 and PE4.
Answers
B.
On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
B.
On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
Answers
C.
On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
C.
On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
Answers
D.
A 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.
D.
A 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.
Answers
Suggested answer: A

Explanation:

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 14

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Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?

A.
This service requires the use of EVPN-MPLS for data plane.
A.
This service requires the use of EVPN-MPLS for data plane.
Answers
B.
In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
B.
In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
Answers
C.
This service consists of a VPRN and multiple VPLSs.
C.
This service consists of a VPRN and multiple VPLSs.
Answers
D.
This service enables the use of EVPN to provide connectivity between hosts in different subnets.
D.
This service enables the use of EVPN to provide connectivity between hosts in different subnets.
Answers
Suggested answer: A

Explanation:

EVPN with integrated routing and bridging (EVPN-IRB) service does not require the use of EVPN-MPLS for data plane. EVPN-IRB service can use either EVPN-MPLS or EVPN-VXLAN for data plane.

Question 15

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Which of the following statements does NOT describe the operation of the Layer-3 EVPN asymmetric forwarding model?

A.
All VPLS instances must be configured on all PES regardless of whether they have a local host or not.
A.
All VPLS instances must be configured on all PES regardless of whether they have a local host or not.
Answers
B.
EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
B.
EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
Answers
C.
The egress PE does not perform any Layer-3 route look up to forward traffic.
C.
The egress PE does not perform any Layer-3 route look up to forward traffic.
Answers
D.
The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
D.
The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
Answers
Suggested answer: A

Explanation:

All VPLS instances do not need to be configured on all PEs regardless of whether they have a local host or not. Only the VPRN instance needs to be configured on all PEs, while the VPLS instances are configured only on PEs that have a local host attached to them.

Question 16

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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?

A.
PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
A.
PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
Answers
B.
PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
B.
PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
Answers
C.
PE2 inspects the service label and determines that it is associated with RVPLS 2.
C.
PE2 inspects the service label and determines that it is associated with RVPLS 2.
Answers
D.
PE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
D.
PE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
Answers
Suggested answer: B

Explanation:

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 17

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The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?

A.
EVPN routes are advertised with a service label associated with the SBD VPLS.
A.
EVPN routes are advertised with a service label associated with the SBD VPLS.
Answers
B.
IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
B.
IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
Answers
C.
EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
C.
EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
Answers
D.
EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
D.
EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
Answers
Suggested answer: D

Explanation:

EVPN MAC/IP routes are not used to advertise the MAC and IP addresses of SBD IRB interfaces.EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts attached to the SBD VPLS2.

Verified

Reference:Nokia Ethernet Virtual Private Network Services Course | Nokia

Question 18

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In the exhibit, the interface-ful numbered model is used for the Layer-3 EVPN service. Which of the following is used as the source MAC address in the packets sent from PEI when forwarding customer traffic to Host 2?

A.
MAC-OI
A.
MAC-OI
Answers
B.
MAC-03
B.
MAC-03
Answers
C.
MAC-04
C.
MAC-04
Answers
D.
MAC-11
D.
MAC-11
Answers
Suggested answer: A

Explanation:

MAC-01 is used as the source MAC address in the packets sent from PE1 when forwarding customer traffic to Host 2.MAC-01 is the MAC address of the SBD IRB interface configured in VPRN 11 on PE12.

Verified

Reference:Nokia Ethernet Virtual Private Network Services Course | Nokia

Question 19

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A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements is FALSE?

A.
Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
A.
Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
Answers
B.
IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
B.
IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
Answers
C.
The VPRN service is configured to allow the advertisement of IP prefixes.
C.
The VPRN service is configured to allow the advertisement of IP prefixes.
Answers
D.
The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
D.
The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
Answers
Suggested answer: D

Explanation:

The SBD IRB interface configured in the VPRN service has an IP address assigned to it.The IP address is used as a gateway IP address for hosts in the corresponding subnet2.

Verified

Reference:Nokia Ethernet Virtual Private Network Services Course | Nokia

Question 20

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An operator configures an EVPN-IRB that uses the interface-ful unnumbered forwarding model on a Nokia 7750 service router. Which of the following statements regarding the configuration performed on each participating PE is FALSE?

A.
A supplementary broadcast domain (SBD) is configured as a routed VPLS.
A.
A supplementary broadcast domain (SBD) is configured as a routed VPLS.
Answers
B.
A VPRN service is configured and has an interface bound to the local VPLS.
B.
A VPRN service is configured and has an interface bound to the local VPLS.
Answers
C.
The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
C.
The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
Answers
D.
An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
D.
An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
Answers
Suggested answer: C

Explanation:

The advertisement of IP-Prefix routes is not enabled in the SBD VPLS.The advertisement of IP-Prefix routes is enabled in the VPRN service that is associated with the SBD VPLS2.

Verified

Reference:Nokia Ethernet Virtual Private Network Services Course | Nokia

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