4A0-D03: Nokia SR Linux EVPN and Data Center Interconnect Dumps & PassGuide 4A0-D03 Examen

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Nokia 4A0-D03 Exam Syllabus Topics:

Section	Objectives
EVPN Fundamentals	- VXLAN data plane basics 1. VTEP operation principles 2. Encapsulation and forwarding behavior - EVPN architecture and control plane 1. MAC/IP advertisement concepts 2. BGP EVPN route types overview
Data Center Interconnect (DCI)	- Resiliency and convergence 1. Multi-site redundancy design 2. Failure handling mechanisms - Interconnecting data centers with EVPN 1. Routing separation and segmentation 2. L2 and L3 extension methods
BGP EVPN Control Plane Operations	- Multi-homing scenarios 1. Active-active and active-standby models 2. DF election mechanisms - Route distribution and policies 1. Policy-based control of EVPN routes 2. Route targets and route distinguishers
SR Linux Data Center Architecture	- Fabric design principles 1. Leaf-spine topology design 2. Scalability and redundancy considerations - SR Linux system fundamentals 1. Network operating system concepts 2. Configuration model and management

>> 4A0-D03 Fragen&Antworten <<

4A0-D03 Examsfragen, 4A0-D03 Antworten

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Nokia SR Linux EVPN and Data Center Interconnect 4A0-D03 Prüfungsfragen mit Lösungen (Q13-Q18):

13. Frage
Consider the exhibit.

All connected leaf routers have the same Ethernet segment configuration. The IP-VRF is configured properly and is operational.
Which of the following statements is FALSE?

A. This Ethernet segment is configured for Layer 3 multi-homing.
B. The redundancy mode for this Ethernet segment is all-active.
C. The EVI for the IP-VRF using this segment is 1000.
D. A LAG must be configured on the connected leaf routers and the host.

Antwort: D

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
The exhibit describes a Layer 3 multi-homing scenario where the Ethernet Segment is associated with an IP-VRF and the configuration references an EVI value of 1000. The segment is configured with all-active multi-homing, allowing multiple attached leaf routers to advertise reachability for the same external L3 next-hop or third-party prefix attachment. In this model, the Ethernet Segment represents the shared L3 attachment and is used by EVPN to associate remote prefix reachability with the multi-homed segment. The incorrect statement is that a LAG must be configured on the connected leaf routers and the host. That requirement is specific to many Layer 2 all-active host attachment designs, where the host commonly uses LACP toward multiple leaf routers and the leaf LAG subinterfaces are associated with the Ethernet Segment. In Layer 3 multi-homing, the attached device can be a router or VNF, and the EVPN ES association can be used for L3 prefix reachability without mandating that the host side be configured as a LAG. Reference: L3 EVPN multi-homing, EVI association, all-active Ethernet Segment behavior.

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

Antwort: C

15. Frage
Consider the exhibit.

All IP-VRFs are configured properly and are operational.
Which of the following statements is FALSE?

A. All traffic destined to 40.40.40.0/24 will be forwarded through Leaf3 due to the BGP connection to the CE VNF.
B. One of the leaf routers will be elected DF.
C. All connected leaf routers will use single active redundancy.
D. The AD per EVI update will be used to identify which connected leaf is primary.

Antwort: C

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
The scenario describes Layer 3 EVPN multi-homing with an IP-VRF service and an external CE VNF advertising the 40.40.40.0/24 prefix through BGP. A DF election can occur among the leaf routers participating in the Ethernet Segment, and the active/primary forwarding node is used for the relevant service behavior. The AD per EVI route can participate in identifying service-level reachability for the Ethernet Segment, and the prefix traffic follows the valid advertised path toward the CE VNF. Because Leaf3 has the BGP connection to the CE VNF, traffic for 40.40.40.0/24 is forwarded through Leaf3. Option B is false because it incorrectly states that all connected leaf routers will use single-active redundancy. The exhibit and answer context indicate a more specific forwarding/primary selection for the service, not a blanket statement that every connected leaf operates using single-active redundancy. In L3 multi-homing, redundancy behavior depends on the ES mode, prefix advertisement, next-hop association, and CE connectivity. The forwarding decision for the customer prefix is tied to the active/valid route advertisement, not to every leaf uniformly acting as single-active. Reference: L3 EVPN multi-homing, DF election, AD per EVI role, PE-CE BGP prefix forwarding.

16. 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. Two MAC addresses associated to the sub-interface are shown in the forwarding table of the MAC-VRF that contains the IRB sub-interface.
B. The host IP address of the sub-interface appears in the IP-VRF route table along with the prefix for the entire sub-net.
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: B

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.

17. Frage
Consider the exhibit.

Which of the following statements about the configuration and operation of this setup is FALSE?

A. The MAC-VRF on Leaf3 will need to be configured with ECMP to be able to load balance between Leaf1 and Leaf2.
B. The host will forward all BUM traffic toward the DF.
C. The Ethernet segment ES-1 is configured with multi-homing-mode all-active.
D. A sub-interface of lag1 is associated to the MAC-VRF on Leaf1 and Leaf2.

Antwort: B

Begründung:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
This scenario describes all-active Layer 2 EVPN multi-homing with a host connected through a LAG to Leaf1 and Leaf2. The LAG subinterface is associated with the MAC-VRF on both participating leaves, and the Ethernet Segment ES-1 is configured for all-active multi-homing. In all-active operation, both leaf routers can be active attachment points for host-originated traffic, and remote traffic can use EVPN multi-homing mechanisms to reach the segment. Option D is false because the host does not know or use the EVPN Designated Forwarder state when sending BUM traffic. The host forwards over its LAG based on its local LAG hashing and LACP behavior. DF election is an EVPN PE-side mechanism used mainly to control which PE forwards BUM traffic from the EVPN overlay toward the Ethernet Segment, preventing duplicate delivery to the multihomed access network. The host itself does not selectively forward all BUM traffic toward the DF. That distinction is critical: DF controls overlay-to-segment replication, while the host's LAG controls host-to-leaf link selection. Reference: all-active L2 EVPN multi-homing, host LAG behavior, DF election scope, BUM forwarding.

18. Frage
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