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NEW QUESTION # 10
Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?
- A. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
- B. This service requires the use of EVPN-MPLS for data plane.
- C. This service consists of a VPRN and multiple VPLSs.
- D. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
Answer: B
Explanation:
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.
NEW QUESTION # 11
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 PE3.
- B. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE2.
- C. PEI does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
- D. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
Answer: B
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 # 12
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- B. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- C. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- D. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
Answer: A
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 13
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-11
- B. MAC-OI
- C. MAC-03
- D. MAC-04
Answer: B
Explanation:
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 References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 14
Based upon the exhibit, which of the following statements is FALSE?
- A. On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
- B. VPLS 10 must be configured with two BGP instances on PE3 and PE4.
- C. 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. On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
Answer: B
Explanation:
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.
NEW QUESTION # 15
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It specifies the service maximum transmission unit (MTU).
- B. It is applicable to EVPN VPLS services.
- C. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- D. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
Answer: B
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 # 16
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 all-active mode, all PES attached to a CE can forward traffic to and from the CE.
- D. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
Answer: C
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 # 17
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 # 18
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
- A. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
- B. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
- C. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
- D. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
Answer: D
Explanation:
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 References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 19
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
- B. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- C. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- D. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
Answer: C
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 # 20
Based upon the exhibit, which of the following statements is FALSE?
- A. Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
- B. PEI populates this information into the local VPLS FDB.
- C. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
- D. PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
Answer: D
Explanation:
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.
NEW QUESTION # 21
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 # 22
Which of the following statements does NOT describe the operation of the Layer-3 EVPN asymmetric forwarding model?
- A. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
- B. All VPLS instances must be configured on all PES regardless of whether they have a local host or not.
- C. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
- D. The egress PE does not perform any Layer-3 route look up to forward traffic.
Answer: B
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 # 23
Based on the exhibit below, which of the following statements is TRUE?
- A. PEI uses this BGP update to build the flooding list of the associated service.
- B. PE2 advertises this BGP update for a locally-configured VPWS service.
- C. Neighbor 10.10.10.2 is connected to a multi-homed CE.
- D. PEI uses MPLS label 524284 when sending traffic destined to
Answer: A
Explanation:
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.
NEW QUESTION # 24
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?
- A. This route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.
- B. This route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
- C. This route indicates that the EVPN service configured on PEI is multi-homed.
- D. This route indicates that the EVPN service is configured on PEI with a service MTU of 1514.
Answer: D
Explanation:
Explanation
This route indicates that the EVPN service is configured on PE1 with a service MTU of 1500, not 1514. The service MTU is indicated by the MPLS label value in hexadecimal format. The MPLS label value of 0x05DC corresponds to a decimal value of 1500.
NEW QUESTION # 25
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. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
- B. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
- C. A VPRN service is configured and has an interface bound to the local VPLS.
- D. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
Answer: A
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 # 26
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