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Nokia 4A0-D03 Exam Syllabus Topics:

Section	Objectives
Topic 1: EVPN Fundamentals	- EVPN architecture and control plane 1. BGP EVPN route types overview 2. MAC/IP advertisement concepts - VXLAN data plane basics 1. Encapsulation and forwarding behavior 2. VTEP operation principles
Topic 2: BGP EVPN Control Plane Operations	- Route distribution and policies 1. Policy-based control of EVPN routes 2. Route targets and route distinguishers - Multi-homing scenarios 1. DF election mechanisms 2. Active-active and active-standby models
Topic 3: Data Center Interconnect (DCI)	- Interconnecting data centers with EVPN 1. L2 and L3 extension methods 2. Routing separation and segmentation - Resiliency and convergence 1. Failure handling mechanisms 2. Multi-site redundancy design
Topic 4: 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

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Nokia SR Linux EVPN and Data Center Interconnect Sample Questions (Q49-Q54):

NEW QUESTION # 49
Which of the following four symmetric routing options does NOT require the use of an EVPN route-type 2?

A. Prefix routing interface-ful unnumbered
B. Host routing
C. Prefix routing interface-ful numbered
D. Prefix routing interface-less

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.

NEW QUESTION # 50
Which of the following statements about the gateway-less data center interconnect solution is FALSE?

A. The data center border leaf and gateway can use either eBGP or static routes to exchange routing information.
B. It provides a clear demarcation for security between the border leaf and gateway.
C. The route reflectors must be reachable between different data centers.
D. All of the data centers leaf routers must be reachable over the WAN network.

Answer: B

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
A gateway-less DCI design extends the data center EVPN/VXLAN model across the WAN without a distinct gateway function separating the data center fabric from the WAN VPN edge. Because the leaf routers or route reflectors must establish the necessary EVPN control-plane and VXLAN data-plane reachability across data centers, the WAN must provide reachability for those fabric endpoints. This design can simplify service continuity and preserve the EVPN overlay model end-to-end, but it does not provide the clean security and QoS demarcation that exists in a decoupled gateway model. A clear demarcation between a border leaf and a separate gateway/WAN PE is specifically a property of decoupled gateway-based DCI, not gateway-less DCI. The gateway-less model also requires reachability between route reflectors or EVPN control-plane endpoints across sites. Therefore, option A is false because it incorrectly assigns the demarcation benefit to the gateway-less design. Reference: gateway-less DCI, stretched EVPN overlay, route-reflector and leaf reachability requirements.

NEW QUESTION # 51
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. The DF will forward all BUM traffic from the remote PEs to the host.
B. Only the DF will accept traffic from the host.
C. Leaf1 and leaf2 will hold an election to identify which leaf router will be the DF for the MAC-VRF.
D. The non-DF is capable of forwarding unicast traffic from the remote PEs to the host.

Answer: D

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 # 52
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 WAN PE maintains a peering session with the data center route reflector.
C. There is a clear demarcation for security and QoS between the data center border leaf and the WAN PE.
D. The IP addresses of all the leaf routers and route-reflectors must be reachable by the routers in the WAN.

Answer: C

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.

NEW QUESTION # 53
Which of the following statements about MAC mobility is TRUE?

A. The originating PE generates a withdraw message after the same locally learned MAC has aged out.
B. The original PE advertises the locally learned MAC with the sequence number set to a maximum value.
C. The originating PE and the destination PE must synchronize their MAC tables.
D. A PE advertising a local MAC that was previously learned through EVPN, will decrement the sequence number in its update.

Answer: A

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
MAC mobility is the EVPN mechanism used when a host MAC moves from one PE to another. The control plane uses a MAC Mobility extended community and sequence number behavior to determine the most recent valid location for the MAC. When a PE locally learns a MAC that was previously learned through EVPN, it advertises the MAC with an incremented sequence number, allowing remote PEs to prefer the newer location. Therefore, option B is wrong because the sequence number is not decremented. Option A is also wrong because the original PE does not advertise the locally learned MAC with a maximum sequence value as a normal mobility procedure. Option D is inaccurate because PEs do not need direct MAC table synchronization; they rely on EVPN control-plane advertisements and withdrawals. The true statement is option C: the originating PE generates a withdraw message after the same locally learned MAC ages out. This withdrawal removes stale reachability from remote PEs and prevents continued forwarding toward a PE that no longer has the host locally attached. Reference: EVPN MAC mobility, sequence-number handling, MAC route withdrawal after aging.

NEW QUESTION # 54
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