最新の[2024年06月09日]4A0-115試験問題集で有効で更新された問題集
無料お試しまもなく終了！100%有効な4A0-115試験問題集には40問があります
Nokia 4A0-115 認定試験の出題範囲：
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質問 # 20
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. PE3
- C. PEI
- D. PE4
正解：A
解説：
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.
質問 # 21
Based upon the exhibit, how many MAC-VRFs are there?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
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)
質問 # 22
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. The advertisement of IP-Prefix routes is enabled in the SBD VPLS.
- C. A supplementary broadcast domain (SBD) is configured as a routed VPLS.
- D. An IP address is configured in the VPRN interface that is bound to the SBD VPLS.
正解：B
解説：
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
質問 # 23
The interface-ful numbered model is used for a Layer-3 EVPN service. Which of the following statements is FALSE?
- A. EVPN routes are advertised with a service label associated with the SBD VPLS.
- B. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of SBD IRB interfaces.
- C. EVPN MAC/IP routes are used to advertise the MAC and IP addresses of local hosts.
- D. IP-Prefix routes exchanged between PES include a non-zero gateway IP address as an overlay index.
正解：B
解説：
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
質問 # 24
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. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
- C. PE3 sets the P flag in its advertised A-D per EVI route to I.
- D. PE2 receives a single A-D per EVI route. The route is originated from PE3.
正解：C
解説：
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)
質問 # 25
Based upon the exhibit, which of the following statements is FALSE?
- A. 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.
- B. On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
- C. VPLS 10 must be configured with two BGP instances on PE3 and PE4.
- D. On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
正解：C
解説：
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.
質問 # 26
Which of the following statements about EVPN auto-discovery per Ethernet segment (A-D per ES) routes is TRUE?
- A. The updates include an Ethernet segment identifier label that is used in loop prevention.
- B. The updates include an Ethernet tag ID that is set to zero.
- C. The updates include an MPLS label that is set to a non-zero value.
- D. The updates advertise the Ethernet segment availability in a given EVPN service.
正解：B
解説：
Explanation
EVPN auto-discovery per Ethernet segment (A-D per ES) routes do not include an Ethernet tag ID that is set to zero. The Ethernet tag ID is set to a non-zero value that identifies the EVPN service instance1.
Verified References: Ethernet Virtual Private Networks (EVPNs)
質問 # 27
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 replicates the traffic and sends it to all PES in its VPLS I flooding list.
- C. PE3 adds an ESI label to packets forwarded to PEI because PEI is connected to the same Ethernet segment.
- D. PE2 decapsulates the packets received from PE3 and forwards the frames to CE2.
正解：C
解説：
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)
質問 # 28
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.
正解：B
解説：
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.
質問 # 29
Which of the following statements about EVPN auto-discovery per EVPN instance (A-D per EVI) routes is FALSE?
- A. A PE uses the received updates to create aliasing lists to PES that are part of an all-active Ethernet segment.
- B. The updates are used to discover all the PES associated with an Ethernet segment.
- C. A PE advertises an A-D per EVI route for each operational service defined on an Ethernet segment.
- D. The updates include an Ethernet tag ID that is set to zero.
正解：C
解説：
Explanation
A PE does not advertise an A-D per EVI route for each operational service defined on an Ethernet segment. A PE advertises a single A-D per EVI route for all services defined on an Ethernet segment.
質問 # 30
Which of the following statements about an EVPN with integrated routing and bridging (EVPN-IRB) service is FALSE?
- A. This service requires the use of EVPN-MPLS for data plane.
- B. In this service, the IRB interface acts as a default gateway for hosts in the corresponding subnet.
- C. This service consists of a VPRN and multiple VPLSs.
- D. This service enables the use of EVPN to provide connectivity between hosts in different subnets.
正解：A
解説：
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.
質問 # 31
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. PE2
- B. PE3
- C. PEI
- D. PE4
正解：B
解説：
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.
質問 # 32
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 consults the FDB of RVPLS 2 and forwards the traffic to Host 2.
- B. PE2 inspects the service label and determines that it is associated with RVPLS 2.
- C. PEI encapsulates the packet with two labels: an outer transport label and an inner service label.
- D. PEI consults the FDB of RVPLS 1 and forwards the traffic to the local interface of VPRN 11.
正解：C
解説：
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)
質問 # 33
Examine the exhibit.
Which of the following configuration is NOT required to enable Layer-2 communication between CEI and CE2?
- A. Configure an MP-BGP session that allows the exchange of IPv4 labeled routes between PE3 and PE4.
- B. Configure a local attachment circuit (AC) and a remote AC for VPWS 4 on all PE routers.
- C. Configure a service distribution point (SDP) on PE3 to reach PE4, and another SDP on PE4 to reach PE3.
- D. Configure an MP-BGP session that allows the exchange of EVPN routes between PEI and PE3.
正解：C
解説：
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
質問 # 34
A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements isFALSE?
- A. The VPRN service is configured to allow the advertisement of IP prefixes.
- B. The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
- C. Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
- D. IP-Prefix routes exchanged between PES include a non-zero MAC address as an overlay index.
正解：B
解説：
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
質問 # 35
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-03
- C. MAC-04
- D. MAC-OI
正解：D
解説：
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
質問 # 36
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