完全版は2023年最新の4A0-115試験問題集テストガイドはトレーニング専門問題
試験準備と合格するための最高なカバー率問題集を提供しています これで試験準備せよ4A0-115
質問 # 18
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. PE2
- C. PE4
- D. PE3
正解：D
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 # 19
Based on the exhibit below, which of the following statements is FALSE?
- A. When forwarding BUM traffic, the local PE must replicate the traffic and send it as unicast to the advertising neighbor.
- B. The MPLS label 524284 presented indicates the service label value that the neighbor 10.10.10.2 uses to forward BUM traffic to PEI.
- C. When forwarding BUM traffic, the local PE uses an MPLS transport tunnel towards the advertising neighbor.
- D. The IMET route is imported by a local VPLS configured with a route-target value of 65100:10.
正解：A
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 # 20
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 and to PE3. An ESI label is included only in the packet sent to PE3.
- 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 but not to PE3 because PE3 is connected to the originating ES.
正解：A
解説：
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.
質問 # 21
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. PEI advertises an auto-discovery per EVPN instance (A-D per EVI) route to PE3 as soon as the SAP becomes operationally
- C. PE3 and PE4 exchange their service labels over an established targeted LDP session.
- D. PE3 advertises an IMET route to PEI as soon as VPWS 4 is administratively enabled.
正解：A
解説：
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)
質問 # 22
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- B. PEI generates an update message to remote PES identifying the new location of CEI.
- C. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- D. CEI generates an update message to PEI withdrawing its MAC.
正解：C
解説：
Explanation
PE2 advertises a MAC/IP route for MAC1 with a sequence number higher than that received from PE1. This indicates that MAC1 has moved from PE1 to PE2 and triggers a MAC withdrawal message from PE1 to remote PEs. CE1 does not generate an update message to PE1 withdrawing its MAC, nor does PE1 generate an update message to remote PEs identifying the new location of CE11.
Verified References: Ethernet Virtual Private Networks (EVPNs)
質問 # 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, blocks Rx unicast, allows Tx BUM, blocks Rx BUM
- B. Blocks Tx unicast, blocks Rx unicast, blocks Tx BUM, blocks Rx BUM
- C. Blocks Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
- D. Allows Tx unicast, allows Rx unicast, blocks Tx BUM, allows Rx BUM
正解：C
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 # 24
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. 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. PEI forwards the traffic received from PE3 to CEI, and CEI discards it based upon the ESI label.
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 # 25
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 indicates that the EVPN service is configured on PEI with an EVPN instance (EVI) of 113.
- C. This route indicates that the EVPN service is configured on PEI with a service MTU of 1514.
- D. This route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
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 # 26
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 PEI must match the local AC tag ID configured on PE3.
- D. The local AC tag ID configured on PE2 must match the local AC tag ID configured on PEI.
正解：D
解説：
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)
質問 # 27
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 advertises locally-learned MAC addresses to remote PES using EVPN type-2 routes.
- C. A PE uses a single MP-BGP session with a remote peer to exchange the routes for all EVIs.
- D. The service distinguisher (label or VNI) is advertised with the MAC/IP EVPN update.
正解：A
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 # 28
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. 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.
- B. PEI advertises an EVPN MAC route for MAC-OI to PE3. The BGP update includes the route-target value configured for VPRN 15.
- 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：A
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 # 29
In the exhibit, the EVPN-IRB is using the interface-ful unnumbered model and is fully operational. Which of the following statements isFALSE?
- A. An MP-BGP session that supports the advertisement of EVPN routes is established between PEI and PE2.
- B. On PE3, the routing table for VPRN 15 contains an entry for 10.10.1.0/24. This entry is resolved to MAC-OI as an overlay index.
- C. On PE3, the routing table for VPRN 15 contains an entry for 10.10.4.0/24. This entry is resolved using a transport tunnel towards PEA.
- D. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
正解：B
解説：
Explanation
On PE3, the routing table for VPRN 15 does not contain an entry for 10.10.1.0/24. This entry is not needed because Host 1 is in the same subnet as the SBD IRB interface on PE3, and PE3 can reach Host 1 using its MAC address2.
Verified References: Nokia Ethernet Virtual Private Network Services Course | Nokia
質問 # 30
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
- A. The Nokia 7750 SR supports a CE being multi-homed to a maximum of two PEs.
- B. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
- C. In the single-active mode, the CE requires a LAG to be configured between the CE and all attached PEs.
- D. In the single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
正解：B
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 # 31
Based upon the exhibit, which of the following statements is FALSE?
- A. On PE3 and PE4, VPLS 10 must be configured with two different route-target values: one for VXLAN and another for MPLS.
- B. On PE3 and PE4, VPLS 10 must be configured with two different route-distinguisher values: one for VXLAN and another for MPLS.
- C. VPLS 10 must be configured with two BGP instances on PE3 and PE4.
- D. 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.
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 # 32
Which of the following statements about the EVPN Layer 2 Attributes extended community is FALSE?
- A. It is advertised with the auto-discovery per EVPN instance (A-D per EVI) route.
- B. It specifies a P flag that indicates whether the advertising PE is a primary PE.
- C. It specifies the service maximum transmission unit (MTU).
- D. It is applicable to EVPN VPLS services.
正解：D
解説：
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)
質問 # 33
Examine the exhibit.
Which of the following statements about the operation of EVPN VPWS 4 is FALSE?
- A. PE3 sets the P flag in its advertised A-D per EVI route to I.
- B. PE2 receives a single A-D per EVI route. The route is originated from PE3.
- C. PEI brings the SAP in VPWS 4 operationally down.
- D. PE2 receives two A-D per ES routes: one from PEI and another from PE3.
正解：A
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 # 34
......
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 |
|
| トピック 2 |
|
| トピック 3 |
|
| トピック 4 |
|
| トピック 5 |
|
| トピック 6 |
|
| トピック 7 |
|
| トピック 8 |
|
| トピック 9 |
|
検証された材料は決まってこれ4A0-115：https://www.passtest.jp/Nokia/4A0-115-shiken.html
合格するために必要な4A0-115試験問題集：https://drive.google.com/open?id=16dJINm7CU0JIKw3qgy76OWtrNB28NNu5