合格させる4A0-115ブレーン問題集で更新されたのは認定サンプル問題
オンライン4A0-115テストブレーン問題集とテストエンジン
Nokia 4A0-115 認定試験の出題範囲：
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質問 # 22
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. MAC/IP routes, A-D per EVI routes, and A-D per 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
正解：A
解説：
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.
質問 # 23
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 10.10.4.0/24. This entry is resolved using a transport tunnel towards PEA.
- C. An MP-BGP session that supports the advertisement of VPN-IPv4 routes is established between PE3 and PE4.
- D. 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.
正解：D
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 # 24
Based on the exhibit below, which of the following statements is TRUE?
- A. PE2 advertises this BGP update for a locally-configured VPWS service.
- B. Neighbor 10.10.10.2 is connected to a multi-homed CE.
- C. PEI uses this BGP update to build the flooding list of the associated service.
- D. PEI uses MPLS label 524284 when sending traffic destined to
正解：C
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 # 25
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. PEI
- C. PE3
- D. PE4
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 # 26
What are EVPN inclusive multicast Ethernet tag (IMET) routes used for?
- A. To advertise the MAC or MAC/IP addresses of locally-learned hosts
- B. To discover all PES participating in the same VPIS service
- C. To advertise the redundancy mode of a local Ethernet segment
- D. To discover all PES attached to the same Ethernet segment
正解：B
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 # 27
Which of the following statements about multi-homing for a Layer-2 service is TRUE?
- A. In the all-active mode, all PES attached to a CE can forward traffic to and from the CE.
- 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 single-active mode, the CE forwards traffic to all attached PES and receives traffic from a single PE.
正解：A
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 # 28
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 does not flood the packet because PEI is acting as non-designated forwarder (non-DF) for VPLS 10.
- C. PEI sends the packet to PE2 but not to PE3 because PE3 is connected to the originating ES.
- D. PEI sends the packet to PE2 and to PE3. An ESI label is included only in the packet sent to PE3.
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 # 29
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 local hosts.
- 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.
正解：C
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 # 30
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. 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. When PEI learns MAC-01, it advertises a MAC/IP route which indicates that MAC-OI is associated with ESI I.
- D. PE3 advertises an A-D per ES route which indicates that ESI I is operating in a single-active redundancy mode.
正解：C
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 # 31
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 indicates that the EVPN service is configured on PEI with a service MTU of 1514.
- C. This route indicates that the EVPN service configured on PEI is multi-homed.
- D. This route is an A-D per EVPN instance (A-D per EVI) route advertised by PEI for a VPWS.
正解：B
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 # 32
A Layer-3 EVPN service is configured to use the interface-ful unnumbered forwarding model. Which of the following statements isFALSE?
- A. Each participating PE advertises a MAC/IP route that carries the MAC address of SBD IRB interface.
- B. The SBD IRB interface configured in the VPRN service has no IP address assigned to it.
- C. The VPRN service is configured to allow the advertisement of IP prefixes.
- 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 # 33
Which of the following statements about the operation of a single-homed EVPN VPWS is TRUE?
- A. The advertised A-D per EVI route includes a non-zero tag ID and a non-zero MPLS label.
- B. Each PE advertises a MAC route and an A-D per EVI route when its local AC becomes operationally UP.
- C. The same tag ID must be configured for the local attachment circuit (AC) at each PE.
- D. Each PE verifies that the received tag ID matches its configured local AC tag ID.
正解：A
解説：
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)
質問 # 34
In the exhibit,
MACI moves from PEI to PE2. Which of the following actions related to this MAC address mobility is performed?
- A. PE2 advertises a MAC/IP route for MACI with a sequence number higher than that received from PEI.
- B. CEI generates an update message to PEI withdrawing its MAC.
- C. PE3 waits to receive a data packet from CEI to update its FDB entry for MACI.
- D. PEI generates an update message to remote PES identifying the new location of CEI.
正解：A
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 # 35
Which of the following statements about the EVPN data plane is FALSE?
- A. EVPN-MPLS provides services over a simple IP network.
- B. The customer data is encapsulated and then tunneled between the PE routers.
- C. EVPN-MPLS encapsulated data has a label that uniquely identifies each service.
- D. EVPN allows a service provider to deliver multiple services over a single core network.
正解：A
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 # 36
Which of the following statements does NOT describe the operation of the Layer-3 EVPN asymmetric forwarding model?
- A. All VPLS instances must be configured on all PES regardless of whether they have a local host or not.
- B. EVPN IP-Prefix routes are used to populate the VPRN VRF tables.
- C. The ingress PE performs both Layer-2 and Layer-3 look ups when forwarding traffic between subnets.
- D. The egress PE does not perform any Layer-3 route look up to forward traffic.
正解：A
解説：
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.
質問 # 37
Which of the following statements about EVPN Layer-3 services that utilize the interface-ful model is TRUE?
- A. VPRN instances are interconnected using a supplementary broadcast domain (SBD) VPLS.
- B. Intra-subnet traffic is carried over the tunnels provided by the SBD VPLS.
- C. EVPN MAC/IP routes are used to advertise the IP prefixes of subnets attached to a VPRN.
- D. The MAC/IP routing information is used to populate the VPRN routing table at the remote PEs.
正解：B
解説：
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
質問 # 38
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