Web: www.solution2pass.com Email: support@solution2pass.com Version: Demo [ Total Questions: 10] Nokia 4A0-D03 Nokia SR Linux EVPN and Data Center Interconnect IMPORTANT NOTICE Feedback We have developed quality product and state-of-art service to ensure our customers interest. If you have any suggestions, please feel free to contact us at feedback@solution2pass.com Support If you have any questions about our product, please provide the following items: exam code screenshot of the question login id/email please contact us at and our technical experts will provide support within 24 hours. support@solution2pass.com Copyright The product of each order has its own encryption code, so you should use it independently. Any unauthorized changes will inflict legal punishment. We reserve the right of final explanation for this statement. Nokia - 4A0-D03 Pass Guaranteed 1 of 9 Only Solution2Pass for Any Exam A. B. C. D. Category Breakdown Category Number of Questions Describe the operations of a Layer 3 EVPN network service, including IRB interfaces, anycast-gateway IP addresses and PE-CE BGP 1 Explain the use of the different EVPN route types 1 Understand different approaches to interconnect multiple data centers over a WAN using EVPN 4 Describe, configure, and verify All-Active and Single-Active L2 and L3 EVPN multi- homing scenarios 3 Describe the use cases for EVPN in the data center 1 TOTAL 10 Question #:1 - [Describe the operations of a Layer 3 EVPN network service, including IRB interfaces, anycast-gateway IP addresses and PE-CE BGP] Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE? The ingress PE performs both MAC and IP forwarding. The egress PE performs MAC forwarding only. EVPN route-type 5 must be supported by the PEs involved. Each MAC-VRF used in the L3 EVPN network must exist on each PE. 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. ================ Nokia - 4A0-D03 Pass Guaranteed 2 of 9 Only Solution2Pass for Any Exam A. B. C. D. A. B. C. D. Question #:2 - [Explain the use of the different EVPN route types] Which of the following four symmetric routing options does NOT require the use of an EVPN route-type 2? Host routing Prefix routing interface-less Prefix routing interface-ful numbered Prefix routing interface-ful unnumbered Answer: C Explanation Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]: EVPN route type 2 carries MAC/IP advertisement information. It is central to host-based routing and to designs where the fabric must distribute host MAC-to-IP bindings for integrated routing and bridging. In host routing, RT-2 is required because individual host reachability is signaled through MAC/IP advertisements. In interface-less prefix routing, RT-2 is still needed because the system relies on host or gateway MAC/IP information associated with the IRB and distributed gateway behavior. Interface-ful unnumbered designs may also require RT-2-style information to resolve next-hop or adjacency behavior because the routed interface does not use a conventional numbered next-hop model. Prefix routing with interface-ful numbered operation is different. In that model, the routed interface has explicit IP addressing and prefix reachability can be carried with L3 prefix routes without requiring EVPN RT-2 host MAC/IP advertisement as a dependency. Therefore, the symmetric routing option that does not require EVPN route type 2 is prefix routing interface-ful numbered. Reference: symmetric L3 EVPN routing models, RT-2 MAC/IP advertisements, prefix routing behavior. ================ Question #:3 - [Understand different approaches to interconnect multiple data centers over a WAN using EVPN] Which of the following statements describes the function or operation of the integrated gateway-based data center interconnect solution? All the data center leaf routers must be reachable over the WAN network. The route reflectors in the different data centers must be able to reach each other. The VXLAN tunnels are required between the leaf routers in the different data centers. The data center gateway and the WAN PE functions are performed on a single router. Answer: D Nokia - 4A0-D03 Pass Guaranteed 3 of 9 Only Solution2Pass for Any Exam A. B. C. D. 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. ================ Question #:4 - [Describe, configure, and verify All-Active and Single-Active L2 and L3 EVPN multi-homing scenarios] Leaf routers are configured to support Layer 2 multi-homing all-active mode. Which of the following statements is FALSE? A LAG must be configured on the participating leaf routers. If VLAN tagging is to be used, then it must be enabled on the LAG interface. If using LACP, the system-id-mac must uniquely identify each leaf router connected to the host. The LAG interface must then be associated with the Ethernet segment. Answer: C Explanation Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]: In all-active Layer 2 EVPN multi-homing, the host is typically dual-homed to two or more leaf routers using a LAG. The participating leaf routers must configure the LAG and associate it with the Ethernet Segment so EVPN can advertise the common ESI and apply aliasing, split-horizon, and DF procedures. If VLAN tagging is used for service separation, tagging must be configured on the LAG interface so that the correct subinterfaces can bind into the MAC-VRF and Ethernet Segment. Option C is false because it states that the LACP system-id-mac must uniquely identify each leaf router. In an all-active EVPN multihomed LAG, the opposite principle applies: from the host's LACP perspective, the multihomed leaf pair must appear as a single logical LACP system. That generally requires a shared LACP system ID or coordinated system MAC Nokia - 4A0-D03 Pass Guaranteed 4 of 9 Only Solution2Pass for Any Exam A. B. C. D. behavior across the participating PEs. If each leaf presented a unique LACP system identity, the host would treat them as separate LAG partners and the all-active bundle would not form correctly. Reference: all-active L2 EVPN multi-homing, LAG attachment, LACP system ID behavior, Ethernet Segment association. ================ Question #:5 - [Understand different approaches to interconnect multiple data centers over a WAN using EVPN] Which of the following statements about the gateway-less data center interconnect solution is FALSE? The IP addresses of the leaf routers need to be re-distributed into the WAN. The EVPN overlay is transparently carried over the WAN network. The leaf routers are able to establish a full mesh of VXLAN tunnels across the WAN. The data center gateway routers maintain a MP-BGP EVPN peering with the data center route reflector. Answer: D Explanation Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]: In a gateway-less DCI design, there is no dedicated gateway device performing EVPN-to-WAN service interworking. Instead, the data center EVPN overlay is extended across the WAN more directly. Because leaf routers must establish overlay reachability across sites, the IP addresses of the leaf VTEPs need to be reachable through the WAN, commonly by redistributing or otherwise carrying the necessary loopback reachability. The WAN transparently carries the EVPN/VXLAN overlay, and leaf routers can establish VXLAN tunnels across the WAN to remote leaves. Option D is false because it introduces “data center gateway routers” maintaining MP-BGP EVPN peering with the data center route reflector. That is not the gateway-less model; it describes a gateway-based role that does not exist as a separate function in this architecture. In gateway-less DCI, the EVPN control-plane and VXLAN data-plane extension are handled by the fabric endpoints themselves, so the design trades demarcation and interworking control for a more direct overlay extension model. Reference: gateway-less DCI, WAN reachability for leaf VTEPs, transparent EVPN overlay carriage, VXLAN tunnel extension. ================ Question #:6 - [Understand different approaches to interconnect multiple data centers over a WAN using EVPN] Consider the exhibit. Nokia - 4A0-D03 Pass Guaranteed 5 of 9 Only Solution2Pass for Any Exam A. B. C. D. Which of the following is NOT configured on dcgw10 to support the Layer 3 VPN connectivity? The base BGP instance to support vpn-ipv4 and evpn address families. A routed VXLAN interface for the VPRN instance. A binding of the VPRN instance to the MPLS tunnels towards dcgw20. A vrf-target matching the vrf-target on dcgw20 in the VPRN instance. 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 data center interconnect design, the gateway must interwork between the data center EVPN/VXLAN domain and the WAN VPN transport domain. For Layer 3 VPN connectivity on a Nokia 7750 SR integrated gateway, the base BGP instance must support the relevant VPN address families, such as VPN-IPv4 and EVPN, because the gateway participates in control-plane exchange between the data center and WAN sides. The VPRN must also be associated with the WAN transport, normally through MPLS tunnel binding, and the VRF target must match the corresponding VPRN on the remote gateway so that VPN routes are imported and exported correctly. A routed VXLAN interface, however, is an SR Linux IP-VRF /VXLAN construct used for symmetric L3 EVPN forwarding inside a VXLAN-based data center fabric. In this question, dcgw10 is acting as the integrated WAN gateway for L3VPN connectivity, so a routed VXLAN interface is not the required configuration item on the VPRN instance. Reference: integrated gateway DCI, VPRN over MPLS, EVPN-to-VPN interworking. ================ Question #:7 - [Describe, configure, and verify All-Active and Single-Active L2 and L3 EVPN multi-homing scenarios] Consider the exhibit. Nokia - 4A0-D03 Pass Guaranteed 6 of 9 Only Solution2Pass for Any Exam A. B. C. D. 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? This Ethernet segment is configured for Layer 3 multi-homing. The EVI for the IP-VRF using this segment is 1000. A LAG must be configured on the connected leaf routers and the host. The redundancy mode for this Ethernet segment is all-active. Answer: C Explanation 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. Nokia - 4A0-D03 Pass Guaranteed 7 of 9 Only Solution2Pass for Any Exam A. B. C. D. ================ Question #:8 - [Understand different approaches to interconnect multiple data centers over a WAN using EVPN] Which of the following statements about the decoupled gateway-based data center interconnect solution is TRUE? The IP addresses of all the leaf routers and route-reflectors must be reachable by the routers in the WAN. There is a clear demarcation for security and QoS between the data center border leaf and the WAN PE. The WAN PE maintains a peering session with the data center route reflector. VXLAN tunnels are established between the leaf routers in the different data centers. Answer: B Explanation 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. ================ Question #:9 - [Describe, configure, and verify All-Active and Single-Active L2 and L3 EVPN multi-homing scenarios] Consider the exhibit. Nokia - 4A0-D03 Pass Guaranteed 8 of 9 Only Solution2Pass for Any Exam A. B. C. D. All IP-VRFs are configured properly and are operational. Which of the following statements is FALSE? One of the leaf routers will be elected DF. All connected leaf routers will use single active redundancy. The AD per EVI update will be used to identify which connected leaf is primary. All traffic destined to 40.40.40.0/24 will be forwarded through Leaf3 due to the BGP connection to the CE VNF. Answer: B Explanation 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 Nokia - 4A0-D03 Pass Guaranteed 9 of 9 Only Solution2Pass for Any Exam A. B. C. D. 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. ================ Question #:10 - [Describe the use cases for EVPN in the data center] Which of the following statements about utilizing VXLAN for the data plane in the data center is FALSE? It allows the creation of a Layer 2 overlay network that can span the entire data center. VXLAN was developed to support EVPN networks in the data center. It may use ECMP to provide efficient utilization of the underlay interfaces within the data center. It has the capability to isolate up to 16 million different overlays. Answer: B Explanation Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]: VXLAN provides a Layer 2 overlay over a Layer 3 underlay by encapsulating Ethernet frames in UDP/IP. This allows tenant bridge domains to span a routed IP fabric without requiring the underlay itself to behave like one large Layer 2 network. VXLAN uses a 24-bit VXLAN Network Identifier, which supports approximately 16 million logical overlays, far exceeding the scale of traditional 12-bit VLAN IDs. Because the VXLAN underlay is IP-routed, traffic can benefit from ECMP across equal-cost paths, improving fabric utilization and resiliency. The false statement is B. VXLAN was not originally developed specifically to support EVPN. VXLAN began as a data-plane overlay encapsulation technology, while EVPN later became the preferred control plane for distributing MAC, MAC/IP, multicast, and prefix reachability in VXLAN- based fabrics. In modern data center design, EVPN and VXLAN are commonly paired: VXLAN supplies the encapsulation and VNI-based segmentation, while EVPN supplies scalable control-plane learning and signaling. Reference: VXLAN data plane, EVPN control plane, ECMP underlay, VNI-based tenant isolation. ================ About solution2pass.com solution2pass.com was founded in 2007. We provide latest & high quality IT / Business Certification Training Exam Questions, Study Guides, Practice Tests. We help you pass any IT / Business Certification Exams with 100% Pass Guaranteed or Full Refund. Especially Cisco, CompTIA, Citrix, EMC, HP, Oracle, VMware, Juniper, Check Point, LPI, Nortel, EXIN and so on. View list of all certification exams: All vendors We prepare state-of-the art practice tests for certification exams. You can reach us at any of the email addresses listed below. Sales: sales@solution2pass.com Feedback: feedback@solution2pass.com Support: support@solution2pass.com Any problems about IT certification or our products, You can write us back and we will get back to you within 24 hours.