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Updated Verified Pass 4A0-115 Exam - Real Questions and Answers
Nokia 4A0-115 Exam Syllabus Topics:
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NEW QUESTION # 22
Which of the following statements about the EVPN route types used to support multi-homing is TRUE?
- A. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
- B. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.
- C. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
- D. ES routes provide the ESI label required to support the split-horizon mechanism.
Answer: A
Explanation:
Explanation
Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment. The redundancy mode can be either single-active or all-active, and it determines how traffic is forwarded to and from a multi-homed CE1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 23
Which of the following best describes the operation of a non-designated forwarder (non-DF) in a single-active Ethernet segment?
- A. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
- B. Allows Tx unicast, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
- C. Blocks Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
- D. Blocks Tx unicast, blocks Rx unicast, blocks Tx BUM, blocks Rx BUM
Answer: C
Explanation:
A non-designated forwarder (non-DF) in a single-active Ethernet segment blocks Tx unicast, allows Rx unicast, blocks Tx BUM, and allows Rx BUM.
This prevents traffic duplication and ensures that only the DF forwards traffic to and from the CE.
NEW QUESTION # 24
Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?
- A. Each PE verifies that the received tag ID matches its configured local AC tag ID.
- B. The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
- C. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
- D. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
Answer: B
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 # 25
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
- B. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
- C. A-D per EVI routes and ES routes only
- D. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
Answer: A
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 # 26
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-OI
- B. MAC-11
- C. MAC-04
- D. MAC-03
Answer: A
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 # 27
Examine the exhibit.
Which of the following configuration conditions is required for the proper operation of EVPN VPWS 2?
- A. The remote AC tag ID configured on PE2 must match the remote AC tag ID configured on PE3.
- B. The local AC tag ID configured on PEI must match the local 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 and the remote AC tag ID configured on PE2 must match.
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 # 28
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. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
- B. 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.
- C. PEI advertises an A-D per ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
- D. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
Answer: D
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 # 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. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
- 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. PEI and PE3 exchange their service labels using A-D per EVI routes.
Answer: D
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
Which of the following statements about PE-to-PE MAC address advertisement is FALSE?
- A. Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
- B. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
- C. A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
- D. The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
Answer: A
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 # 31
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. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- C. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
- D. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
Answer: B
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 # 32
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. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
- D. A VPRN service is configured and has an interface bound to the local 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 # 33
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. EVPN routes are advertised with a service label associated with the SBD VPLS.
- C. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
- D. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
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 # 34
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. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- C. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
- D. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
Answer: B
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 # 35
Examine the exhibit.
Which of the following statements about the EVPN routes exchanged for EVPN VPWS 2 is TRUE?
- A. All PES advertise a MAC route that includes a non-zero MPLS label.
- B. PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
- C. PEI advertises an A-D per EVI route that includes a tag ID set to 40.
- D. PE2 advertises an A-D per EVI route that includes a P flag set to I.
Answer: A
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 36
Based upon the exhibit, which of the following statements is FALSE?
- A. PEI uses VXLAN tunnels to reach neighbors 10.10.10.2 and 10.10.10.3.
- B. Neighbors 10.10.10.2 and 10.10.10.3 have a service that uses a network identifier of 10.
- C. PEI populates this information into the local VPLS FDB.
- D. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
Answer: A
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 # 37
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?
- A. PE3
- B. PE4
- C. PEI
- D. PE2
Answer: A
Explanation:
Explanation
PE3 is elected as DF for VPLS 10. The preference-based algorithm uses the highest preference value of the PEs attached to the same Ethernet segment as the tie-breaker criterion. PE3 has the highest preference value among PE1, PE2, and PE3.
NEW QUESTION # 38
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