4A0-D03 aktueller Test, Test VCE-Dumps für Nokia SR Linux EVPN and Data Center Interconnect

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Nokia 4A0-D03 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Layer 2 EVPN Services	25%	- Multi-homing and Ethernet Segments - EVPN Route Types 1–4 - Anycast Gateway and IRB
Topic 2: SR Linux and EVPN Fundamentals	25%	- EVPN control plane and MP-BGP - SR Linux architecture and CLI - VXLAN encapsulation and underlay
Topic 3: Data Center Interconnect (DCI) Solutions	25%	- Interoperability with Nokia 7750 SR - Gateway-less EVPN DCI - BGP route policies and route reflectors
Topic 4: Layer 3 EVPN Services	25%	- EVPN Route Type 5 - VRF integration and route targets - Symmetric and asymmetric routing

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Nokia SR Linux EVPN and Data Center Interconnect 4A0-D03 Prüfungsfragen mit Lösungen (Q53-Q58):

53. Frage
Which of the following statements about the decoupled gateway-based data center interconnect solution is TRUE?

A. VXLAN tunnels are established between the leaf routers in the different data centers.
B. The IP addresses of all the leaf routers and route-reflectors must be reachable by the routers in the WAN.
C. The WAN PE maintains a peering session with the data center route reflector.
D. There is a clear demarcation for security and QoS between the data center border leaf and the WAN PE.

Antwort: D

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A decoupled gateway-based DCI model separates the data center border-leaf function from the WAN PE function. This separation is the key design point. The border leaf remains part of the data center EVPN/VXLAN environment, while the WAN PE participates in WAN VPN transport and policy enforcement. Because the roles are split across two devices, the handoff between the border leaf and WAN PE provides a clean administrative and operational boundary. That boundary is useful for security policy, QoS marking, traffic classification, and troubleshooting ownership. The WAN does not need direct reachability to every leaf and route reflector as in a gateway-less model. The WAN PE also does not peer directly with the data center route reflector in a decoupled model; route exchange occurs through the border-leaf/WAN-PE handoff. VXLAN tunnels between leaf routers across different data centers are characteristic of gateway-less extension, not decoupled gateway operation. Therefore, the statement about clear demarcation between the data center border leaf and WAN PE is the accurate description. Reference: decoupled gateway-based DCI, security/QoS demarcation, WAN PE separation.

54. Frage
Which of the following statements about a BGP route target is FALSE?

A. The route-target is a BGP extended community.
B. It identifies the EVPN instance in the control plane.
C. It is advertised with every EVPN route update.
D. It is defined in MP-BGP to allow for overlapping MAC addresses from multiple tenants.

Antwort: B

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A BGP route target is an extended community used to control which EVPN routes are imported into which MAC-VRF or IP-VRF. It is carried with EVPN updates and acts as the import/export policy tag for tenant service membership. The statement that it is a BGP extended community is correct. It is also correct that route targets support multi-tenant operation, because they allow different EVPN instances to carry potentially overlapping MAC or IP information while importing only the routes intended for that service. However, option D is false in the wording used here. The route target does not itself identify the EVPN instance in the control plane as a unique route identifier. That role is more closely associated with the route distinguisher and EVPN NLRI construction, while the route target determines import eligibility. A route target tells a receiving PE whether the route belongs in a local service instance, but it is not the unique identity of the EVPN route. This distinction is critical: route distinguishers make routes unique; route targets control route distribution and service membership. Reference: EVPN route targets, BGP extended communities, route import/export policy, RD versus RT function.

55. Frage
An IRB sub-interface that is being used to interconnect a MAC-VRF to an IP-VRF, is configured with anycast-gw set to true and anycast-gw enabled.
Which of the following statements is FALSE?

A. The host IP address of the sub-interface appears in the IP-VRF route table along with the prefix for the entire sub-net.
B. Two MAC addresses associated to the sub-interface are shown in the forwarding table of the MAC-VRF that contains the IRB sub-interface.
C. The same IP address used on this sub-interface can be used by other IRB sub-interfaces on remote PEs participating in the IP-VRF.
D. The last octet of the default virtual MAC assigned to the sub-interface is derived from the last octet of the chassis MAC.

Antwort: A

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
An anycast-gateway IRB allows multiple PEs to present the same default-gateway IP address to hosts in the same subnet. This is the mechanism that enables distributed gateway behavior in EVPN fabrics. The same anycast gateway IP may be configured on equivalent IRB subinterfaces across remote PEs participating in the same IP-VRF, allowing hosts to use the nearest leaf as their default gateway without changing their gateway address. SR Linux also associates gateway MAC information with the IRB, including virtual gateway MAC behavior used inside the MAC-VRF forwarding table. Option C is false because the anycast gateway IP is not treated as a normal unique host route that appears in the IP-VRF route table alongside the subnet prefix. The subnet route is installed for the connected network, but the shared anycast gateway address is a gateway function, not a separately advertised host endpoint that should appear as ordinary routed host reachability. Treating the anycast IP as a regular host route would undermine the distributed gateway model and create ambiguous ownership across PEs. Reference: IRB anycast gateway, MAC-VRF/IP-VRF interconnection, distributed default-gateway operation.

56. Frage
Which of the following statements about the configuration of a Layer 3 multi-homing with a centralized router is FALSE?

A. The centralized router will advertise the customer prefixes using an EVPN route-type 5 update.
B. All routers participating in the Ethernet segment must have the multi-homing mode set to all-active.
C. Remote leaf routers can load balance traffic to customer prefixes through the leaf routers connected to the Ethernet segment.
D. The centralized router must be a member of the Ethernet segment.

Antwort: B

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Layer 3 EVPN multi-homing with a centralized router uses an Ethernet Segment to associate multiple leaf routers with a common external L3 attachment. The centralized router is part of that attached segment from the forwarding perspective, and the connected leaf routers advertise third-party or customer prefixes into EVPN so that remote leaves can reach those prefixes through the multi-homed attachment. For L3 EVPN, learned customer prefixes are normally advertised using EVPN route type 5, which carries IP prefix reachability. In an all-active design, remote leaf routers may load balance traffic to the customer prefix through multiple attached leaf routers because the ES next-hop allows the remote PE to understand that the prefix is reachable through a multi-homed Ethernet Segment. The false statement is that every router participating in the Ethernet Segment must be configured with all-active mode. Multi-homing mode is a design and configuration property of the EVPN PEs participating in the ES, and designs may use single-active or all-active behavior depending on redundancy and forwarding requirements. Reference: L3 EVPN multi-homing, centralized router attachment, EVPN RT-5 prefix advertisement.

57. Frage
A host is connected to multiple PEs through multi-homing.
Which of the following is NOT a function of the EVPN route-type 4 route?

A. Triggers the election of a designated forwarder.
B. Identifies the redundancy mode of the Ethernet segment.
C. Allows the other PEs to discover which PEs are connected to the same Ethernet segment.
D. Identifies the type of algorithm to be used in the election process.

Antwort: D

58. Frage
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