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Nokia 4A0-D03 Exam Syllabus Topics:

Section	Objectives
Topic 1: 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 2: EVPN Fundamentals	- VXLAN data plane basics 1. Encapsulation and forwarding behavior 2. VTEP operation principles - EVPN architecture and control plane 1. MAC/IP advertisement concepts 2. BGP EVPN route types overview
Topic 3: 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. DF election mechanisms 2. Active-active and active-standby models
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 (Q21-Q26):

NEW QUESTION # 21
Consider the exhibit.

All three of the leafs have a MP-BGP EVPN session to the route-reflector Spine-1. Leaf-1, Leaf-2 and Leaf-3 have existing instances of an L2 EVPN named MAC VRF-1. Host-1 has just sent its first Ethernet frame into MAC VRF-1 on Leaf-1.
Which of the following steps is FALSE?

A. Leaf-1 populates Host-1's MAC address learnt on the local interface to its MAC table.
B. Leaf-1 generates an EVPN route-type 5 update with Host-1's MAC address and sends it to the route reflector.
C. The route-reflector forwards the EVPN update to Leaf-2 and Leaf-3.
D. Leaf-2 and Leaf-3 import the EVPN update based upon the route target.

Answer: B

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
When Host-1 sends its first Ethernet frame into MAC VRF-1, Leaf-1 performs normal local data-plane MAC learning on the access interface and installs Host-1's MAC address into the MAC forwarding table. In an L2 EVPN MAC-VRF, host MAC reachability is then advertised into the EVPN control plane using EVPN route type 2, the MAC/IP Advertisement route. Route type 5 is not used for host MAC advertisement; RT-5 is used for IP prefix advertisement in Layer 3 EVPN services. Therefore, option B is false because it incorrectly states that Leaf-1 generates an EVPN RT-5 update with the host MAC address. In this topology, Leaf-1 sends the correct EVPN update to the route reflector, Spine-1. The route reflector then reflects the update to Leaf-2 and Leaf-3, and those remote leaves import the route if the route target matches their MAC VRF-1 import policy. The route target controls service membership, ensuring that only PEs participating in the same EVPN instance import the MAC route. Reference: L2 EVPN MAC learning, RT-2 MAC/IP advertisement, route-reflector distribution, route-target import.

NEW QUESTION # 22
Leaf routers are configured to support Layer 2 multi-homing all-active mode.
Which of the following statements is FALSE?

A. The multi-homing mode of all-active must be configured for the Ethernet segment.
B. The Ethernet segment must be administratively enabled.
C. The 2nd through 7th octets of the ESI must not be all zeros.
D. All of the sub-interfaces of the LAG must be configured in 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]:
For Layer 2 all-active EVPN multi-homing on SR Linux, the Ethernet Segment configuration is the control-plane anchor that binds the redundant access attachment to EVPN. The relevant LAG subinterfaces must be associated with the Ethernet Segment so that the PE can advertise the segment correctly and apply split-horizon and aliasing behavior. The Ethernet Segment must also be administratively enabled; otherwise, the PE will not participate properly in ES discovery and DF procedures. The multi-homing mode must be set to all-active to permit forwarding through multiple attached leaf routers and support host-side LAG operation. The false statement is option B. The Ethernet Segment Identifier has a defined structure, and the blanket statement that the 2nd through 7th octets "must not be all zeros" is not a valid requirement as stated. What matters operationally is that the ESI uniquely identifies the same multi-homed Ethernet Segment across participating PEs and is consistently configured where required. The ESI must be non-zero as a meaningful segment identifier, but the specific octet restriction in the option is not the SR Linux all-active configuration rule. Reference: SR Linux L2 EVPN all-active multi-homing, Ethernet Segment configuration, LAG association.

NEW QUESTION # 23
Consider the exhibit.

The network is going to be designed to use interface-less symmetric routing.
Which of the following statements is TRUE?

A. Forwarding information will be exchanged between the PEs using EVPN route-type 2 updates.
B. The IRB configuration does not require anycast gateway configuration on the ip-vrf.
C. An instance of each mac-vrf is required on each leaf.
D. The ingress PE will perform layer 2 and layer 3 lookups while the egress PE will perform layer 2 lookup.

Answer: A

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In interface-less symmetric routing, the EVPN fabric exchanges host forwarding information using EVPN route type 2 MAC/IP advertisements. RT-2 carries the host MAC address and, when present, the associated host IP address, allowing remote PEs to build the forwarding state needed for distributed gateway operation. Unlike asymmetric routing, interface-less symmetric routing does not require every MAC-VRF to be instantiated on every PE. The design scales better because each leaf only needs the locally attached MAC-VRFs plus the shared IP-VRF/routed VXLAN construct for inter-subnet forwarding. Option B describes an asymmetric forwarding pattern more than a symmetric one; in symmetric routing, both ingress and egress PEs perform routed forwarding functions through the IP-VRF. Option C is also incorrect because anycast gateway is fundamental when multiple leaves provide the same default-gateway service for a subnet. Therefore, the true statement is that forwarding information is exchanged using EVPN route type 2 updates. Reference: interface-less symmetric routing, EVPN RT-2 host MAC/IP signaling, distributed IRB operation.

NEW QUESTION # 24
Which of the following EVPN route-types is used to implement aliasing?

A. IP/MAC routes
B. AD per ES routes
C. Ethernet segment routes
D. AD per EVI routes

Answer: D

NEW QUESTION # 25
Which of the following statements about utilizing asymmetric routing in an L3 EVPN network is FALSE?

A. The ingress and egress PE routers will perform both MAC and IP forwarding.
B. Each PE must have a full ARP table for all of the hosts in the L3 EVPN network.
C. All the MAC-VRFs connected to the L3 EVPN network must exist on each PE.
D. If a host interface's has two IP addresses, it must send out two separate EVPN route-type 2 updates for the MAC-VRF.

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Asymmetric routing relies heavily on host MAC/IP information because the ingress PE performs routing into the destination subnet and then sends the frame across the overlay using the destination MAC-VRF/VNI. This means PEs require enough ARP and MAC/IP binding information to forward traffic toward remote hosts correctly. If a host has multiple IP addresses on the same interface, separate EVPN route type 2 advertisements may be needed to communicate each IP-to-MAC binding. The ingress and egress PEs participate in MAC and IP forwarding across the end-to-end service path, but the forwarding responsibilities differ by direction and stage. The false statement is option C. The statement says all MAC-VRFs connected to the L3 EVPN network must exist on each PE, but that is not the correct requirement in this question's verified answer set. In practical EVPN designs, the exact MAC-VRF placement depends on whether the service is implemented as asymmetric, symmetric, interface-less, or interface-ful routing. Here, the course answer marks the universal MAC-VRF requirement as false. Reference: asymmetric L3 EVPN routing, RT-2 MAC/IP advertisements, ARP and MAC forwarding behavior.

NEW QUESTION # 26
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