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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 1

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Which of the following statements about the EVPN data plane is FALSE?

A.
EVPN allows a service provider to deliver multiple services over a single core network.
A.
EVPN allows a service provider to deliver multiple services over a single core network.
Answers
B.
The customer data is encapsulated and then tunneled between the PE routers.
B.
The customer data is encapsulated and then tunneled between the PE routers.
Answers
C.
EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
C.
EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
Answers
D.
EVPN-MPLS provides services over a simple IP network.
D.
EVPN-MPLS provides services over a simple IP network.
Answers
Suggested answer: D

Explanation:

EVPN-MPLS provides services over an MPLS network, not a simple IP network.The customer data is encapsulated with an MPLS label that identifies the service and then tunneled between the PE routers using MPLS LSPs1.

Verified

Reference:Ethernet Virtual Private Networks (EVPNs)

Question 2

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Based upon the exhibit, how many MAC-VRFs are there?

A.
1
A.
1
Answers
B.
2
B.
2
Answers
C.
3
C.
3
Answers
D.
4
D.
4
Answers
Suggested answer: B

Explanation:

There are two MAC-VRFs in the exhibit, one for each EVI.A MAC-VRF is a logical entity that contains the MAC forwarding information for a given EVI1.

Verified

Reference:Ethernet Virtual Private Networks (EVPNs)

Question 3

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Which of the following statements about multi-homing for a Layer-2 service is TRUE?

A.
In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
A.
In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
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B.
In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
B.
In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
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C.
In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
C.
In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
Answers
D.
The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
D.
The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
Answers
Suggested answer: C

Explanation:

In the all-active mode, all PEs attached to a CE can forward traffic to and from the CE. This provides load balancing and redundancy for the CE.The CE does not require a LAG to be configured between the CE and all attached PEs1.

Verified

Reference:Ethernet Virtual Private Networks (EVPNs)

Question 4

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

A.
The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
A.
The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
Answers
B.
Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
B.
Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
Answers
C.
A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
C.
A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
Answers
D.
A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
D.
A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
Answers
Suggested answer: B

Explanation:

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

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Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?

A.
EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
A.
EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
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B.
VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
B.
VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
Answers
C.
Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
C.
Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
Answers
D.
The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
D.
The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
Answers
Suggested answer: C

Explanation:

In the interface-ful model, VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.The MAC/IP routing information is not used to populate the VPRN routing table at the remote PEs, but rather to populate the FDB of the SBD VPLS2.

Verified

Reference:Nokia Ethernet Virtual Private Network Services Course | Nokia

Question 6

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Based upon the exhibit,

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

A.
PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
A.
PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
Answers
B.
PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
B.
PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
Answers
C.
PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
C.
PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
Answers
D.
PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
D.
PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
Answers
Suggested answer: B

Explanation:

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 7

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In the exhibit,

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

A.
CEI generates an update message to PEI withdrawing its MAC.
A.
CEI generates an update message to PEI withdrawing its MAC.
Answers
B.
PEI generates an update message to remote PES identifying the new location of CEI.
B.
PEI generates an update message to remote PES identifying the new location of CEI.
Answers
C.
PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
C.
PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
Answers
D.
PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
D.
PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
Answers
Suggested answer: C

Explanation:

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 8

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What are EVPN inclusive multicast Ethernet tag (IMET) routes used for?

A.
To advertise the MAC or MAC/IP addresses of locally-learned hosts
A.
To advertise the MAC or MAC/IP addresses of locally-learned hosts
Answers
B.
To advertise the redundancy mode of a local Ethernet segment
B.
To advertise the redundancy mode of a local Ethernet segment
Answers
C.
To discover all PES participating in the same VPIS service
C.
To discover all PES participating in the same VPIS service
Answers
D.
To discover all PES attached to the same Ethernet segment
D.
To discover all PES attached to the same Ethernet segment
Answers
Suggested answer: C

Explanation:

EVPN inclusive multicast Ethernet tag (IMET) routes are used to discover all PEs participating in the same VPIS service. These routes are also used to build the flooding list for BUM traffic.

Question 9

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Based on the exhibit below, which of the following statements is FALSE?

When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.

A.
The MPLS label 524284 presented indicates the service label value that the neighbor 10.10.10.2 uses to forward BUM traffic to PEI.
A.
The MPLS label 524284 presented indicates the service label value that the neighbor 10.10.10.2 uses to forward BUM traffic to PEI.
Answers
B.
When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
B.
When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
Answers
C.
The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
C.
The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
Answers
Suggested answer: A

Explanation:

When forwarding BUM traffic, the local PE does not replicate the traffic and send it as unicast to the advertising neighbor. Instead, the local PE uses an MPLS transport tunnel towards the advertising neighbor and sends the traffic with an MPLS label that indicates the service.

Question 10

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Based on the exhibit below, which of the following statements is TRUE?

A.
PE2 advertises this BGP update for a locally-configured VPWS service.
A.
PE2 advertises this BGP update for a locally-configured VPWS service.
Answers
B.
PEI uses this BGP update to build the flooding list of the associated service.
B.
PEI uses this BGP update to build the flooding list of the associated service.
Answers
C.
PEI uses MPLS label 524284 when sending traffic destined to
C.
PEI uses MPLS label 524284 when sending traffic destined to
Answers
D.
Neighbor 10.10.10.2 is connected to a multi-homed CE.
D.
Neighbor 10.10.10.2 is connected to a multi-homed CE.
Answers
Suggested answer: B

Explanation:

PE1 uses this BGP update to build the flooding list of the associated service. The update contains an IMET route that indicates that neighbor 10.10.10.2 is participating in a VPLS service with a network identifier of 10.

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