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

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In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements is FALSE?
Examine the exhibit. Which of the following configuration conditions is required for the proper operation of EVPN VPWS 2?
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
Based upon the exhibit, how many MAC-VRFs are there?
In the exhibit, VPWS 4 enables communications between CEI and CE2. Which of the following statements regarding the operation of VPWS 4 is FALSE?
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?
Examine the exhibit. Which of the following actions is performed by PEI after it receives a BUM packet from CEI?
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?
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 the EVPN route types used to support multi-homing is TRUE?

Question 31

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

A.
It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
A.
It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
Answers
B.
It is applicable to EVPN VPLS services.
B.
It is applicable to EVPN VPLS services.
Answers
C.
It specifies the service maximum transmission unit (MTU).
C.
It specifies the service maximum transmission unit (MTU).
Answers
D.
It specifies a P flag that indicates whether the advertising PE is a primary PE.
D.
It specifies a P flag that indicates whether the advertising PE is a primary PE.
Answers
Suggested answer: B

Explanation:

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)

Question 32

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Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?

A.
The same tag ID must be configured for the local attachment circuit (AC) at each PE.
A.
The same tag ID must be configured for the local attachment circuit (AC) at each PE.
Answers
B.
Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
B.
Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
Answers
C.
The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
C.
The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
Answers
D.
Each PE verifies that the received tag ID matches its configured local AC tag ID.
D.
Each PE verifies that the received tag ID matches its configured local AC tag ID.
Answers
Suggested answer: C

Explanation:

The advertised A-D per EVI route includes a non-zero tag ID and a zero MPLS label.The tag ID is used to identify the VPWS service, while the MPLS label is not used for single-homed VPWS services1.

Verified

Reference:Ethernet Virtual Private Networks (EVPNs)

Question 33

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Examine the exhibit.

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

A.
PEI advertises an A-D per EVI route that includes a tag ID set to 40.
A.
PEI advertises an A-D per EVI route that includes a tag ID set to 40.
Answers
B.
PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
B.
PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
Answers
C.
PE2 advertises an A-D per EVI route that includes a P flag set to I.
C.
PE2 advertises an A-D per EVI route that includes a P flag set to I.
Answers
D.
All PES advertise a MAC route that includes a non-zero MPLS label.
D.
All PES advertise a MAC route that includes a non-zero MPLS label.
Answers
Suggested answer: D

Explanation:

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 34

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Examine the exhibit.

Which of the following statements about the operation of EVPN VPWS 4 is FALSE?

A.
PEI brings the SAP in VPWS 4 operationally down.
A.
PEI brings the SAP in VPWS 4 operationally down.
Answers
B.
PE3 sets the P flag in its advertised A-D per EVI route to I.
B.
PE3 sets the P flag in its advertised A-D per EVI route to I.
Answers
C.
PE2 receives a single A-D per EVI route. The route is originated from PE3.
C.
PE2 receives a single A-D per EVI route. The route is originated from PE3.
Answers
D.
PE2 receives two A-D per ES routes: one from PEI and another from PE3.
D.
PE2 receives two A-D per ES routes: one from PEI and another from PE3.
Answers
Suggested answer: B

Explanation:

PE3 does not set the P flag in its advertised A-D per EVI route to 1. PE3 sets the P flag to 0, indicating that it is not the DF for EVI 20.PE1 sets the P flag to 1, indicating that it is the DF for EVI 201.

Verified

Reference:Ethernet Virtual Private Networks (EVPNs)

Question 35

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Examine the exhibit.

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

A.
The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
A.
The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
Answers
B.
The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
B.
The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
Answers
C.
The local AC tag ID and the remote AC tag ID configured on PE2 must match.
C.
The local AC tag ID and the remote AC tag ID configured on PE2 must match.
Answers
D.
The local AC tag ID configured on PEI must match the local AC tag ID configured on PE3.
D.
The local AC tag ID configured on PEI must match the local AC tag ID configured on PE3.
Answers
Suggested answer: A

Explanation:

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 36

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

A.
PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
A.
PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
Answers
B.
PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
B.
PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
Answers
C.
PEI and PE3 exchange their service labels using A-D per EVI routes.
C.
PEI and PE3 exchange their service labels using A-D per EVI routes.
Answers
D.
PE3 and PE4 exchange their service labels over an established targeted LDP session.
D.
PE3 and PE4 exchange their service labels over an established targeted LDP session.
Answers
Suggested answer: C

Explanation:

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 37

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Examine the exhibit.

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

A.
Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
A.
Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
Answers
B.
Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
B.
Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
Answers
C.
Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
C.
Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
Answers
D.
Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
D.
Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
Answers
Suggested answer: C

Explanation:

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 38

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Examine the exhibit.

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

A.
The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
A.
The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
Answers
B.
PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
B.
PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
Answers
C.
PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
C.
PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
Answers
D.
PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
D.
PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
Answers
Suggested answer: D

Explanation:

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 39

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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?

A.
PEI 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.
A.
PEI 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.
Answers
B.
PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
B.
PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
Answers
C.
PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
C.
PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
Answers
D.
PE4 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.
D.
PE4 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.
Answers
Suggested answer: D

Explanation:

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 40

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

A.
An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
A.
An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
Answers
B.
An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
B.
An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
Answers
C.
On 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.
C.
On 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.
Answers
D.
On 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
D.
On 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
Answers
Suggested answer: C

Explanation:

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


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