PDF (New 2024) Actual Nokia 4A0-115 Exam Questions
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NEW QUESTION # 15
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 # 16
Examine the exhibit.
Which of the following statements about the EVPN routes exchanged for EVPN VPWS 2 is TRUE?
- A. PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
- B. All PES advertise a MAC route that includes a non-zero MPLS label.
- C. PE2 advertises an A-D per EVI route that includes a P flag set to I.
- D. PEI advertises an A-D per EVI route that includes a tag ID set to 40.
Answer: B
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 # 17
Which of the following statements about the EVPN route types used to support multi-homing is TRUE?
- A. ES routes provide the ESI label required to support the split-horizon mechanism.
- B. Auto-discovery (A-D) routes are imported by all PES participating in the EVPN service.
- C. Ethernet segment (ES) routes indicate the redundancy mode of the Ethernet segment.
- D. A-D per Ethernet segment routes indicate the desired designated forwarder election algorithm.
Answer: C
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 # 18
Examine the exhibit.
Which of the following statements about the operation of EVPN VPWS 4 is FALSE?
- A. PEI brings the SAP in VPWS 4 operationally down.
- B. PE3 sets the P flag in its advertised A-D per EVI route to I.
- C. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
- D. PE2 receives a single A-D per EVI route. The route is originated from PE3.
Answer: B
Explanation:
Explanation
PE3 does not set the P flag in its advertised A-D per EVI route to 1. PE3 sets the P flag to 0, indicating that it is not the DF for EVI 20. PE1 sets the P flag to 1, indicating that it is the DF for EVI 201.
Verified References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 19
Based upon the exhibit, how many MAC-VRFs are there?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
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 References: Ethernet Virtual Private Networks (EVPNs)
NEW QUESTION # 20
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. PE4
- B. PE3
- C. PEI
- D. PE2
Answer: B
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 # 21
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.
- B. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
- C. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
- D. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
Answer: B
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 # 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 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: 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
Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?
- A. This service consists of a VPRN and multiple VPLSs.
- B. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
- C. This service requires the use of EVPN-MPLS for data plane.
- D. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
Answer: C
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 # 24
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. A VPRN service is configured and has an interface bound to the local 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. 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 # 25
Based upon the exhibit, which of the following statements is FALSE?
- A. Neighbors 10.10.10.2 and 10.10.10.3 have proxy-ARP enabled for the VPLS.
- 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 a service that uses a network identifier of 10.
- 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 # 26
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. PE3
- B. PE4
- C. PE2
- D. PEI
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 # 27
Examine the exhibit.
Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?
- A. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
- B. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
- C. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
- D. Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
Answer: A
Explanation:
Explanation
The advertisement of IP-Prefix routes is not required to enable Layer-2 communication between CE1 and CE2. IP-Prefix routes are used to enable Layer-3 communication between different subnets in an EVPN-IRB service. For Layer-2 communication, only MAC/IP routes are required2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 28
Which of the following EVPN routes are exchanged to support the operation of a multi-homed EVPN VPWS?
- A. MAC/IP routes, A-D per EVI routes, and A-D per ES routes
- B. A-D per EVI routes, A-D per ES routes, and Ethernet segment (ES) routes
- C. Auto-discovery per EVPN instance (A-D per EVI) routes and Auto-discovery per Ethernet segment (A-D per ES) routes only
- D. A-D per EVI routes and ES routes only
Answer: B
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 # 29
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 # 30
A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements isFALSE?
- A. IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
- B. The VPRN service is configured to allow the advertisement of IP prefixes.
- C. The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
- D. Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
Answer: C
Explanation:
Explanation
The SBD IRB interface configured in the VPRN service has an IP address assigned to it. The IP address is used as a gateway IP address for hosts in the corresponding subnet2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
NEW QUESTION # 31
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Updated Jun-2024 Pass 4A0-115 Exam - Real Practice Test Questions: https://www.actualtestsquiz.com/4A0-115-test-torrent.html
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