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Nokia 4A0-D03 - Nokia SR Linux EVPN and Data Center Interconnect

Last Update Jul 17, 2026

Nokia Certification Exams Pack

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  • Exam Name: Nokia SR Linux EVPN and Data Center Interconnect
  • 56 Questions Answers with Explanation Detail
  • Total Questions: 56 Q&A's
  • Single Choice Questions: 56 Q&A's


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Total Questions: 56
Free Practice Questions: 32

When PEs are connected to an Ethernet segment with at least one active MAC-VRF, which of the following statements about the AD per EVI updates sent by a PE is FALSE?

Options:

A.

It is used by the remote peers for aliasing.

B.

It advertises the multi-homing mode used by the PEs for the Ethernet segment.

C.

It contains the VNI that is to be used by the remote peers in the data plane.

D.

It contains the route-target so that the update can be imported into the correct MAC-VRF instance.

Answer
D
Explanation

Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:

Ethernet Auto-Discovery per EVI information is used in EVPN multi-homing to advertise that a PE has reachability to a particular Ethernet Segment for a specific EVPN instance. Remote PEs use this information for aliasing, allowing them to forward known unicast traffic toward a multi-homed Ethernet Segment through eligible PEs rather than relying only on the PE that advertised a specific MAC route. In VXLAN-based EVPN, the update also carries information needed by remote peers to select the proper data-plane encapsulation and VNI for the service. The multi-homing behavior advertised with the Ethernet Segment enables remote peers to understand whether the attachment is operating in all-active or single-active mode. Option D is the false statement in this context because route-target handling is a general BGP EVPN import/export mechanism associated with VPN route policy and extended communities; it is not the specific operational function that defines AD per EVI behavior. The AD per EVI route's purpose is Ethernet Segment reachability for an EVI, not route-target-based service identification by itself. Reference: EVPN route type 1, AD per EVI, aliasing and multi-homing signaling.

================

Consider the exhibit.

Question # 2

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?

Options:

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.

================

Which of the following statements about PE-CE routing is FALSE?

Options:

A.

There are two methods to implement routing between the PE and CE, static and dynamic.

B.

BGP is the preferred option for PE-CE routing as it scales better than static routing.

C.

eBGP is preferred which means that the PE and CE are required to be in different autonomous systems.

D.

The CE advertises BGP EVPN route type 5 updates to the PE and the PE forwards to other PEs.

Answer
D
Explanation

Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:

PE-CE routing is the mechanism used to exchange customer prefix reachability between a provider edge or data center leaf and the attached customer edge router. It can be implemented statically or dynamically. Static routing is operationally simple but does not scale well when many prefixes or frequent changes are involved. BGP is preferred for larger deployments because it supports policy, route filtering, attributes, and automated advertisement of changing reachability. In most EVPN PE-CE designs, eBGP is preferred because it creates a clean routing boundary between the PE and CE, with each device operating in a different autonomous system. Option D is false because the CE does not advertise BGP EVPN route type 5 updates to the PE. The CE advertises ordinary IPv4 or IPv6 unicast prefixes over the PE-CE routing session. The PE then imports those customer prefixes into the IP-VRF and advertises them into the EVPN overlay as route type 5 IP Prefix routes toward other PEs. This distinction matters: EVPN signaling is a PE-to-PE overlay function, not a CE-originated EVPN control-plane role. Reference: PE-CE routing, eBGP, EVPN RT-5 prefix advertisement.

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Nokia 4A0-D03 FAQ'S

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