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Nokia 4A0-D03 Exam Syllabus Topics:

SectionObjectives
Topic 1: SR Linux Data Center Architecture- Fabric design principles
  • 1. Leaf-spine topology design
    • 2. Scalability and redundancy considerations
      - SR Linux system fundamentals
      • 1. Configuration model and management
        • 2. Network operating system concepts
          Topic 2: 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
                  Topic 3: 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
                          Topic 4: BGP EVPN Control Plane Operations- Route distribution and policies
                          • 1. Route targets and route distinguishers
                            • 2. Policy-based control of EVPN routes
                              - Multi-homing scenarios
                              • 1. Active-active and active-standby models
                                • 2. DF election mechanisms

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                                  Nokia SR Linux EVPN and Data Center Interconnect Sample Questions (Q24-Q29):

                                  NEW QUESTION # 24
                                  Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?

                                  Answer: C

                                  Explanation:
                                  Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
                                  In asymmetric L3 EVPN routing, the ingress PE performs the routing decision and then sends traffic across the overlay in the context of the destination MAC-VRF. The egress PE performs Layer 2 MAC forwarding only toward the destination host. This is why options A and B correctly describe asymmetric data-plane behavior. Asymmetric routing relies heavily on EVPN route type 2 MAC/IP Advertisement routes because the ingress PE must know the destination host's MAC/IP binding and the destination bridge domain information. EVPN route type 5, which advertises IP prefixes, is a symmetric L3 EVPN mechanism and is not mandatory for asymmetric routing. Therefore, option C is false. Option D is treated as correct in this asymmetric-routing model because each PE participating in inter-subnet forwarding needs the destination MAC-VRF context to encapsulate traffic toward the correct L2 VNI. This requirement is one reason asymmetric routing scales less efficiently than symmetric routing: MAC-VRF presence and host reachability information must be broadly available. Symmetric routing improves scale by using an IP-VRF routed VXLAN interface and RT-5 prefix routes instead. Reference: asymmetric L3 EVPN routing, ingress IP/MAC forwarding, egress MAC forwarding, RT-2 versus RT-5 usage.


                                  NEW QUESTION # 25
                                  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?

                                  Answer: A

                                  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 # 26
                                  Which of the following statements about a distributed Layer 2 EVPN is FALSE?

                                  Answer: B

                                  Explanation:
                                  Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
                                  In a distributed Layer 2 EVPN service, the local leaf learns host reachability from frames received on access interfaces. When a host replies to an ARP request, the local leaf can learn the source MAC address from the Ethernet frame and install it in the MAC forwarding table. If the ARP payload contains an IP/MAC binding, the PE can also use that information for proxy ARP and EVPN MAC/IP advertisement. The local PE then advertises the learned endpoint reachability using EVPN route type 2 to its BGP EVPN peers or route reflector. The false statement is B. The ARP reply is not replicated to every leaf in the flooding list as a normal operation. EVPN's purpose is to reduce unnecessary flooding by distributing endpoint reachability through the control plane. BUM replication is used for broadcast, unknown unicast, and multicast traffic when needed, but a learned ARP reply does not require blind replication to all remote leaves. Instead, the leaf advertises the learned MAC/IP state through MP-BGP EVPN, allowing remote PEs to install accurate forwarding and proxy ARP state. Reference: distributed L2 EVPN operation, ARP learning, EVPN RT-2 advertisement.


                                  NEW QUESTION # 27
                                  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?

                                  Answer: B


                                  NEW QUESTION # 28
                                  Which of the following statements about a L3 EVPN network using symmetric routing is FALSE?

                                  Answer: C

                                  Explanation:
                                  Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
                                  Symmetric L3 EVPN routing uses an IP-VRF-based overlay model in which both ingress and egress PEs participate in routed forwarding. The ingress PE receives the frame from the local MAC-VRF, routes it into the IP-VRF, and sends it across the VXLAN routed interface. The egress PE receives the routed overlay packet, performs the corresponding IP-VRF lookup, and then forwards it into the locally attached destination MAC-VRF. Because the routed overlay is built per IP-VRF, a routed-VXLAN interface is required for that IP-VRF. EVPN route type 5 support is also required because RT-5 carries IP prefix reachability across the EVPN control plane. The false statement is option D. Symmetric routing specifically removes the requirement for every MAC-VRF to exist on every PE. A PE only needs the MAC-VRFs for locally attached subnets, plus the shared IP-VRF and routed overlay state. This is the major scaling advantage of symmetric routing compared with designs that require broad MAC-VRF instantiation across the fabric. Reference: symmetric L3 EVPN routing, routed VXLAN interface, RT-5 prefix reachability, MAC-VRF scaling.


                                  NEW QUESTION # 29
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