[2024年06月] 確実合格する有効な方法 Nokia 試験問題集 4A0-115 試験学習ガイド [Q24-Q42]

[2024年06月] 確実合格する有効な方法Nokia試験問題集で4A0-115試験学習ガイド

4A0-115問題集とNokia Ethernet Virtual Private Network Servicesトレーニングコースでお客様の合格を楽にさせる学習合格試験問題！

質問 # 24
Proxy-ARP/ND is operational for a VPLS. Which of the following statements is FALSE?

A. The proxy-ARP table is populated by snooping IP packets received from remote PEs.
B. When the PE learns a local host IP address, it adds an entry into its proxy-ARP table.
C. The PE has proxy-ARP and dynamic-populate enabled for the VPLS.
D. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.

正解：B

解説：
Explanation
When the PE learns a local host IP address, it does not add an entry into its proxy-ARP table. The proxy-ARP table is populated by snooping IP packets received from remote PEs. The PE advertises a MAC/IP route that includes the MAC and IP address of a local host.

質問 # 25
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, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
B. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
C. Blocks Tx unicast, blocks Rx unicast, blocks Tx BUM, blocks Rx BUM
D. Blocks Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM

正解：D

解説：
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.

質問 # 26
Examine the exhibit.

Which of the following statements about the operation of VPLS 20 is TRUE?

A. The flooding list maintained by PEI for VPLS 20 contains three entries: PE2, PE3, and PE4.
B. PE3 advertises an IMET route to PEI when its VPLS 20's mesh-SDP becomes operationally UP.
C. PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
D. PEI advertises a MAC route for MAC-OI when its VPLS 2(Ys SAP becomes operationally UP.

正解：D

解説：
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)

質問 # 27
Examine the exhibit.

Which of the following statements about the operation of EVPN VPWS 4 is FALSE?

A. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
B. PE2 receives a single A-D per EVI route. The route is originated from PE3.
C. PE3 sets the P flag in its advertised A-D per EVI route to I.
D. PEI brings the SAP in VPWS 4 operationally down.

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 # 28
Based upon the exhibit,

which of the following statements about the forwarding of BUM traffic is FALSE?

A. PE3 replicates the traffic and sends it to all PES in its VPLS I flooding list.
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. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.

正解：B

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 # 29
What are EVPN inclusive multicast Ethernet tag (IMET) routes used for?

A. To discover all PES participating in the same VPIS service
B. To advertise the MAC or MAC/IP addresses of locally-learned hosts
C. To advertise the redundancy mode of a local Ethernet segment
D. To discover all PES attached to the same Ethernet segment

正解：A

解説：
Explanation
EVPN inclusive multicast Ethernet tag (IMET) routes are used to discover all PEs participating in the same VPIS service. These routes are also used to build the flooding list for BUM traffic.

質問 # 30
Examine the exhibit.

Which of the following statements about the EVPN routes exchanged for EVPN VPWS 2 is TRUE?

A. PE2 advertises an A-D per EVI route that includes a P flag set to I.
B. All PES advertise a MAC route that includes a non-zero MPLS label.
C. PEI advertises an A-D per EVI route that includes a non-zero Layer-2 MTLJ.
D. PEI advertises an A-D per EVI route that includes a tag ID set to 40.

正解：B

解説：
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)

質問 # 31
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. PEI uses MPLS label 524284 when sending traffic destined to
C. PE2 advertises this BGP update for a locally-configured VPWS service.
D. Neighbor 10.10.10.2 is connected to a multi-homed CE.

正解：A

解説：
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.

質問 # 32
In the exhibit, the EVPN-IRB is configured to use the interface-ful unnumbered model. Which of the following statements regarding the route advertisement is FALSE?

A. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
B. PE4 advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. The BGP update includes MAC-04 as an overlay index.
C. PE3 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE4. The BGP update includes an MPLS service label.
D. PEI advertises an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE3. The BGP update includes MAC-OI as on overlay index.

正解：B

解説：
Explanation
PE4 does not advertise an EVPN IP-Prefix route for prefix 10.10.1.0/24 to PE2. PE4 advertises a VPN-IPv4 route for prefix 10.10.1.0/24 to PE2, which includes the MPLS service label of VPRN 152.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia

質問 # 33
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. PEI
B. PE4
C. PE3
D. PE2

正解：C

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 # 34
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-04
B. MAC-11
C. MAC-OI
D. MAC-03

正解：C

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 # 35
Which of the following statements about PE-to-PE MAC address advertisement is FALSE?

A. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
B. Route targets are used to uniquely identify routes between EVIS in the case of MAC address overlaps.
C. The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
D. A PE advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.

正解：B

解説：
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)

質問 # 36
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 configured on PEI is multi-homed.
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 is configured on PEI with a service MTU of 1514.
D. This route indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.

正解：C

解説：
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.

質問 # 37
Which of the following statements about the EVPN data plane is FALSE?

A. EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
B. EVPN allows a service provider to deliver multiple services over a single core network.
C. EVPN-MPLS provides services over a simple IP network.
D. The customer data is encapsulated and then tunneled between the PE routers.

正解：C

解説：
Explanation
EVPN-MPLS provides services over an MPLS network, not a simple IP network. The customer data is encapsulated with an MPLS label that identifies the service and then tunneled between the PE routers using MPLS LSPs1.
Verified References: Ethernet Virtual Private Networks (EVPNs)

質問 # 38
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 ES route which indicates that ESI 1 is operating in a single-active redundancy mode.
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 EVI route which includes a P flag set to I to indicate that PEI is the DF for EVI 20.
D. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.

正解：B

解説：
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.

質問 # 39
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 single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
D. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.

正解：D

解説：
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)

質問 # 40
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Nokia 4A0-115 認定試験の出題範囲：

トピック	出題範囲
トピック 1	EVPN route types advertised to support EVPN VPLS Use of EVPN IMET routes to populate the VPLS flooding lists
トピック 2	Use of EVPN routes to populate route tables EVPN integrated routing and bridging (IRB) architecture
トピック 3	Configuring an EVPN VPLS using MPLS encapsulation EVPN-VXLAN and EVPN-MPLS interconnect for a VPLS
トピック 4	Use of EVPN for data center services EVPN route types required to support multi-homing
トピック 5	Layer-3 symmetric interface-ful numbered model EVPN route types advertised to support EVPN-IRB
トピック 6	Operation of preference-based DF election algorithm Aliasing mechanism used to enable load-balancing
トピック 7	Operation of a single-active EVPN VPWS EVPN route types advertised to support EVPN VPWS
トピック 8	Use of EVPN to support Layer-3 routing EVPN basic operation
トピック 9	Configuring an EVPN VPLS using VXLAN encapsulation Use of EVPN MAC routes to populate the VPLS FDB tables