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NEW QUESTION # 16
Examine the exhibit.
Which of the following actions is performed by PEI after it receives a BUM packet from CEI?
- A. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- B. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
- C. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
- D. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
Answer: A
Explanation:
Explanation
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.
NEW QUESTION # 17
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It is applicable to EVPN VPLS services.
- B. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
- C. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- D. It specifies the service maximum transmission unit (MTU).
Answer: A
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 18
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.
- B. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
- C. The egress PE does not perform any Layer-3 route look up to forward traffic.
- D. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
Answer: A
Explanation:
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.
NEW QUESTION # 19
In the exhibit, the default algorithm is used to elect the designated forwarder (DF) on ESI 1. Which PE is elected as DF for VPLS 10?
- A. PEI
- B. PE3
- C. PE2
- D. PE4
Answer: C
Explanation:
Explanation
PE2 is elected as DF for VPLS 10. The default algorithm uses the lowest IP address of thePEs attached to the same Ethernet segment as the tie-breaker criterion. PE2 has the lowest IP address among PE1, PE2, and PE3.
NEW QUESTION # 20
What are EVPN inclusive multicast Ethernet tag (IMET) routes used for?
- A. To advertise the redundancy mode of a local Ethernet segment
- B. To advertise the MAC or MAC/IP addresses of locally-learned hosts
- C. To discover all PES participating in the same VPIS service
- D. To discover all PES attached to the same Ethernet segment
Answer: C
Explanation:
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.
NEW QUESTION # 21
An operator configures an EVPN-IRB that uses the interface-ful unnumbered forwarding model on a Nokia
7750 service router. Which ofthe following statements regarding the configuration performed on each participating PE is FALSE?
- A. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
- B. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
- C. A VPRN service is configured and has an interface bound to the local VPLS.
- D. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
Answer: B
Explanation:
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 References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 22
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
- A. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
- B. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
- C. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
- D. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
Answer: D
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 23
In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements isFALSE?
- A. 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.
- B. An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
- C. 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 PEA.
- D. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
Answer: A
Explanation:
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 References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 24
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. PE2 inspects the service label and determines that it is associated with RVPLS 2.
- B. PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
- C. PE2 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
- D. PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
Answer: D
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 25
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PEI generates an update message to remote PES identifying the new location of CEI.
- B. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- C. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- D. CEI generates an update message to PEI withdrawing its MAC.
Answer: C
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 26
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.
- B. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
- C. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
- D. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.
Answer: B
Explanation:
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.
NEW QUESTION # 27
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 PEI must match the local AC tag ID configured on PE3.
- B. The local AC tag ID and the remote AC tag ID configured on PE2 must match.
- C. The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
- D. The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
Answer: D
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 28
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. PE3 and PE4 exchange their service labels over an established targeted LDP session.
- B. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- C. PEI and PE3 exchange their service labels using A-D per EVI routes.
- D. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
Answer: C
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 29
The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?
- A. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
- B. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
- C. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
- D. EVPN routes are advertised with a service label associated with the SBD VPLS.
Answer: C
Explanation:
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 References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 30
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.
- B. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- C. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- D. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
Answer: B
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 31
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.
- B. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
- C. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
- 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.
Answer: D
Explanation:
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 References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 32
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