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Nokia 4A0-D03 Exam Syllabus Topics:

Section	Objectives
Operations, Troubleshooting and Best Practices	- Network optimization and scaling considerations - Troubleshooting BGP EVPN and VXLAN issues - Monitoring SR Linux and EVPN environments
SR Linux Architecture and Fundamentals	- Network operating system concepts and containerized routing functions - SR Linux system architecture and components - Configuration and operational models
EVPN and VXLAN Data Center Fabric	- VXLAN data plane and encapsulation - EVPN route types and MAC/IP advertisement - EVPN control plane fundamentals
Data Center Interconnect (DCI)	- L2 and L3 DCI design patterns - Redundancy and high availability strategies - EVPN-based interconnect solutions
BGP and Routing in Data Center Environments	- BGP EVPN address families - Interoperability between routing domains - Route reflection and scaling design

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Nokia SR Linux EVPN and Data Center Interconnect Sample Questions (Q18-Q23):

NEW QUESTION # 18
When providing L3 multi-homing on two or more leaf routers, which of the following is FALSE?

A. In a single-active multi-homing scenario, the DF-election is used to identify the active leaf router.
B. The Ethernet segment is associated with the next-hop for the 3rd party prefixes.
C. In an all-active multi-homing scenario, the DF-election is used to identify the leaf router that is responsible for forwarding BUM traffic to the host.
D. All learned 3rd party prefixes are advertised using EVPN route type 5.

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Layer 3 multi-homing is fundamentally about redundant or load-balanced L3 reachability for external prefixes, not about Layer 2 broadcast-domain flooding toward a host. In single-active L3 multi-homing, DF election determines which attached leaf is active for the Ethernet Segment, and only that leaf advertises or forwards for the attached customer route as required by the redundancy model. In all-active L3 multi-homing, multiple leaf routers can be valid next-hops for the same learned third-party prefix, and remote PEs may load-balance toward them based on the Ethernet Segment association. Learned external prefixes are carried as EVPN route type 5 IP Prefix routes, which is the correct route type for L3 reachability. The Ethernet Segment is associated with the next-hop for those prefixes so that remote PEs understand the multi-homed nature of the path. Option B is false because BUM forwarding is a Layer 2 EVPN concern. In an all-active L3 multi-homing scenario, DF election is not used to identify a BUM-forwarding leaf for host traffic in the same way it is used in Layer 2 multi-homing services. Reference: L3 EVPN multi-homing, RT-5 prefix routes, ES next-hop behavior.

NEW QUESTION # 19
A host is connected to a MAC-VRF on leaf1 and leaf2. The MAC-VRF interfaces on leaf1 and leaf2 are associated to an Ethernet segment configured for active-standby multi-homing.
Which of the following statements is FALSE?

A. Leaf1 and leaf2 will hold an election to identify which leaf router will be the DF for the MAC-VRF.
B. The non-DF is capable of forwarding unicast traffic from the remote PEs to the host.
C. Only the DF will accept traffic from the host.
D. The DF will forward all BUM traffic from the remote PEs to the host.

Answer: B

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In active-standby, or single-active, Layer 2 EVPN multi-homing, only one PE is active for the Ethernet Segment and MAC-VRF at a time. Leaf1 and Leaf2 participate in DF election, and the elected DF becomes the active forwarding PE for that service attachment. Because this is not all-active multi-homing, the non-DF must not forward traffic to the host for the protected service. This prevents duplicate frames, incorrect MAC learning, and loops on the access side. The DF accepts traffic from the host and forwards BUM traffic received from remote PEs toward the host-facing segment. Option D is false because it claims that the non-DF can forward unicast traffic from remote PEs to the host. In single-active operation, remote peers must direct traffic to the active PE, and the standby PE remains ready to take over only after DF state changes. This is the operational distinction from all-active multi-homing, where more than one PE may be used for forwarding depending on the traffic type and aliasing behavior. Reference: single-active L2 EVPN multi-homing, DF role, non-DF forwarding suppression.

NEW QUESTION # 20
Which of the following statements about configuring and using an integrated routing and bridging (IRB) interface is TRUE?

A. When using an IRB interface to interconnect a MAC-VRF to an IP-VRF, one sub-interface is configured for the MAC-VRF and another one for the IP-VRF.
B. The IRB sub-interface must be configured as either type bridge or routed.
C. When the IRB sub-interface is configured with multiple IP addresses, one of them can be configured as the primary.
D. A MAC-VRF can be configured with multiple IRB sub-interfaces to support multi-homing.

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
An IRB interface is the logical connection point between a Layer 2 MAC-VRF and a Layer 3 IP-VRF. It provides the routed gateway function for hosts in the bridge domain while allowing traffic to move into the routed VRF for inter-subnet forwarding. The correct statement is that when an IRB sub-interface has multiple IP addresses, one can be designated as the primary. This is important because the primary address is used for normal gateway or subnet behavior when more than one address is present on the same routed interface context. Option A is inaccurate because the question is about an IRB sub-interface, not a generic subinterface selection between bridge or routed access modes. Option B is not the defining multi-homing model; EVPN multi-homing is implemented through Ethernet Segment association and MAC-VRF attachment behavior, not by adding multiple IRB subinterfaces for multi-homing. Option D is also wrong because the IRB is the shared logical link between the MAC-VRF and IP-VRF; the design does not require separate IRB subinterfaces on each side as independent constructs. Reference: SR Linux IRB configuration, MAC-VRF to IP-VRF interconnection, primary IP addressing.

NEW QUESTION # 21
Which of the following statements describes the function or operation of the integrated gateway-based data center interconnect solution?

A. The VXLAN tunnels are required between the leaf routers in the different data centers.
B. The data center gateway and the WAN PE functions are performed on a single router.
C. All the data center leaf routers must be reachable over the WAN network.
D. The route reflectors in the different data centers must be able to reach each other.

Answer: B

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In an integrated gateway-based DCI design, the same physical or logical router performs both the data center gateway role and the WAN PE role. This is why option D is correct. The device terminates or participates in the data center-side EVPN service and also handles the WAN-side VPN transport, including route translation or re-advertisement where needed. This approach avoids exposing every data center leaf router to the WAN and avoids requiring route reflector reachability between data centers. It also avoids building VXLAN tunnels directly between all leaf routers in separate data centers. Those characteristics belong to gateway-less DCI, where the EVPN overlay stretches more directly across the WAN and the WAN must carry the underlay or overlay reachability required by the data center leaves. Integrated gateway design is more controlled: the gateway is the interworking point, which makes it suitable when the provider or operator wants a strong service boundary and centralized DCI policy enforcement. Reference: integrated gateway-based DCI, single-router gateway/WAN PE function, EVPN/VPN interworking.

NEW QUESTION # 22
Which of the following statements about EVPN PE-CE routing, using BGP as the routing protocol, is FALSE?

A. The PE advertises updates received from the CE as EVPN route type 5 updates to the other PEs.
B. The PE and CE can utilize import and export policies to control the updates that are sent and received.
C. iBGP is preferred between the CE and PE so that they will be in the same autonomous system.
D. The PE advertises IPv4/IPv6 BGP updates to the CE based on the EVPN routes received from other PEs.

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In EVPN PE-CE routing, the PE exchanges ordinary IPv4 or IPv6 unicast routing information with the CE. When the PE learns CE prefixes, it imports them into the tenant IP-VRF and advertises them to other EVPN PEs as EVPN route type 5 IP Prefix routes. Conversely, when the PE receives EVPN routes from remote PEs, it can advertise corresponding IPv4/IPv6 BGP updates toward the CE, subject to policy. Import and export policies are essential because they control which customer routes are accepted, which EVPN-learned routes are advertised, and how attributes are modified. Option C is false because iBGP is not the preferred PE-CE model in this context. eBGP is typically preferred between PE and CE because it creates a clean administrative routing boundary between the provider/data-center edge and the customer or external router. Using eBGP also simplifies route policy, loop prevention, and operational separation. The CE does not need to participate in the EVPN overlay; it speaks standard BGP unicast with the PE, while the PE performs the EVPN RT-5 advertisement into the fabric. Reference: EVPN PE-CE BGP routing, eBGP preference, RT-5 prefix advertisement, import/export policy.

NEW QUESTION # 23
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