2023 The Most Effective 4A0-115 with 40 Questions Answers
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NEW QUESTION # 20
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
- B. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
- C. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
- D. A-D per EVI routes and ES routes only
Answer: C
Explanation:
Explanation
A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes are exchanged to support the operation of a multi-homed EVPN VPWS. These routes are used to discover all PEs associated with an Ethernet segment, indicate the redundancy mode of the Ethernet segment, and elect the designated forwarder for each service.
NEW QUESTION # 21
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. PE2
- B. PE4
- C. PEI
- D. PE3
Answer: A
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 # 22
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.
- B. Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
- C. A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
- D. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
Answer: B
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 23
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. A VPRN service is configured and has an interface bound to the local VPLS.
- C. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
- D. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
Answer: D
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 # 24
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 uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
- C. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
- D. PEI populates this information into the local VPLS FDB.
Answer: B
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 # 25
Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?
- A. The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
- B. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
- C. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
- D. Each PE verifies that the received tag ID matches its configured local AC tag ID.
Answer: A
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 26
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 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 and to PE3. An ESI label is included only in the packet sent to PE3.
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 # 27
In the exhibit,
VPLS 20 is associated with a single-active Ethernet segment on routers PEI and PE3. Which of the following statementsis FALSE?
- A. PEI advertises an A-D per EVI route which includes a P flag set to I to indicate that PEI is the DF for EVI 20.
- B. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
- C. PEI advertises an A-D per ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
- D. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
Answer: B
Explanation:
Explanation
When PE1 learns MAC-01, it advertises a MAC/IP route which indicates that MAC-01 is associated with ESI
1. This route is used by remote PEs to populate their FDBs with MAC-01 and its corresponding ESI.
NEW QUESTION # 28
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. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
- C. The egress PE does not perform any Layer-3 route look up to forward traffic.
- D. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
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 # 29
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 and PE3 exchange their service labels using A-D per EVI routes.
- B. PE3 and PE4 exchange their service labels over an established targeted LDP session.
- C. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- D. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
Answer: A
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 # 30
Examine the exhibit.
Which of the following statements about the operation of VPLS 20 is TRUE?
- A. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
- B. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
- C. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.
- D. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
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 # 31
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 and the remote AC tag ID configured on PE2 must match.
- B. The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
- C. The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
- D. The local AC tag ID configured on PEI must match the local AC tag ID configured on PE3.
Answer: C
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 # 32
Based on the exhibit below, which of the following statements is FALSE?
- 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.
- B. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
- C. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- D. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
Answer: C
Explanation:
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.
NEW QUESTION # 33
Based upon the exhibit,
which of the following statements about the forwarding of BUM traffic is FALSE?
- A. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
- B. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
- C. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- D. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
Answer: C
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 # 34
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 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 is applicable to EVPN VPLS services.
Answer: D
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 # 35
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