100% Pass 2026 Nokia 4A0-D03: The Best New Nokia SR Linux EVPN and Data Center Interconnect Exam Vce

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Nokia 4A0-D03 Exam Syllabus Topics:

Section	Objectives
BGP EVPN Control Plane Operations	- Multi-homing scenarios 1. Active-active and active-standby models 2. DF election mechanisms - Route distribution and policies 1. Route targets and route distinguishers 2. Policy-based control of EVPN routes
Data Center Interconnect (DCI)	- Resiliency and convergence 1. Failure handling mechanisms 2. Multi-site redundancy design - Interconnecting data centers with EVPN 1. L2 and L3 extension methods 2. Routing separation and segmentation
SR Linux Data Center Architecture	- Fabric design principles 1. Scalability and redundancy considerations 2. Leaf-spine topology design - SR Linux system fundamentals 1. Network operating system concepts 2. Configuration model and management
EVPN Fundamentals	- VXLAN data plane basics 1. Encapsulation and forwarding behavior 2. VTEP operation principles - EVPN architecture and control plane 1. BGP EVPN route types overview 2. MAC/IP advertisement concepts

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Nokia SR Linux EVPN and Data Center Interconnect Sample Questions (Q27-Q32):

NEW QUESTION # 27
e-BGP is used as the routing protocol in the data center underlay.
When configuring the EVPN MP-BGP route reflector sessions, which of the following statements is FALSE?

A. If redundant route reflectors are deployed, the client leaf routers will receive duplicated updates.
B. A second route reflector can be deployed for redundancy purposes.
C. The leaf's underlay autonomous system number is used for the route reflector EVPN peering sessions.
D. The cluster-id that uniquely identifies the route reflector is only configured on the route reflector itself.

Answer: C

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In many SR Linux data center fabrics, eBGP is used in the underlay because it gives simple hop-by-hop routing, fast convergence, and clean autonomous-system separation between leaf and spine nodes. The EVPN overlay, however, is a separate MP-BGP control plane used to distribute EVPN NLRI. The overlay route-reflector session does not have to reuse the leaf's underlay autonomous system number. In practice, an overlay BGP group may use a distinct local AS or configuration model separate from the underlay AS design. Therefore, option B is false. The route reflector's cluster ID is configured on the route reflector itself to prevent reflection loops and identify the RR cluster. Redundant route reflectors can be deployed for resiliency, and clients may receive duplicate paths or duplicate updates from multiple RRs; the BGP decision process and route reflection rules handle this. The key design distinction is that underlay eBGP provides IP reachability between loopbacks, while overlay MP-BGP EVPN carries tenant service reachability. Mixing these roles leads to incorrect AS planning. Reference: SR Linux EVPN MP-BGP route reflectors, eBGP underlay, overlay BGP sessions.

NEW QUESTION # 28
Which of the following statements about configuring and using an integrated routing and bridging (IRB) interface is TRUE?

A. When the IRB sub-interface is configured with multiple IP addresses, one of them can be configured as the primary.
B. A MAC-VRF can be configured with multiple IRB sub-interfaces to support multi-homing.
C. When using an IRB interface to interconnect a MAC-VRF to an IP-VRF, one sub-interface is configured for the MAC-VRF and another one for the IP-VRF.
D. The IRB sub-interface must be configured as either type bridge or routed.

Answer: A

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
An IRB interface is the logical connection point between a Layer 2 MAC-VRF and a Layer 3 IP-VRF. It provides the routed gateway function for hosts in the bridge domain while allowing traffic to move into the routed VRF for inter-subnet forwarding. The correct statement is that when an IRB sub-interface has multiple IP addresses, one can be designated as the primary. This is important because the primary address is used for normal gateway or subnet behavior when more than one address is present on the same routed interface context. Option A is inaccurate because the question is about an IRB sub-interface, not a generic subinterface selection between bridge or routed access modes. Option B is not the defining multi-homing model; EVPN multi-homing is implemented through Ethernet Segment association and MAC-VRF attachment behavior, not by adding multiple IRB subinterfaces for multi-homing. Option D is also wrong because the IRB is the shared logical link between the MAC-VRF and IP-VRF; the design does not require separate IRB subinterfaces on each side as independent constructs. Reference: SR Linux IRB configuration, MAC-VRF to IP-VRF interconnection, primary IP addressing.

NEW QUESTION # 29
Which of the following EVPN route-types is used to implement aliasing?

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

Answer: A

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Aliasing is an EVPN multi-homing mechanism that allows remote PEs to send traffic to any eligible PE attached to the same Ethernet Segment, even if a specific MAC address was learned and advertised by only one of those PEs. This avoids a traffic bottleneck and enables load-sharing in all-active multi-homing designs. The route type used to implement this behavior is the Ethernet Auto-Discovery per EVI route, commonly referred to as AD per EVI. This route tells remote PEs that a given PE has reachability to a specific Ethernet Segment for a specific EVPN instance. When remote PEs receive these advertisements from multiple PEs for the same ESI and EVI, they can treat those PEs as valid next-hops for traffic toward that Ethernet Segment. Ethernet Segment routes support ES discovery and DF election, while IP/MAC routes advertise host MAC and optionally IP binding information. AD per ES routes are used for broader Ethernet Segment-level procedures, but aliasing at the service level relies on AD per EVI reachability. Reference: EVPN route type 1, AD per EVI, aliasing in all-active multi-homing.

NEW QUESTION # 30
Consider the exhibit.

Which of the following statements about the proxy ARP entry for the neighbor IP 192.168.100.1 is FALSE?

A. All traffic destined to 192.168.100.1 will be discarded for 9 minutes if the state changes to duplicate.
B. The traffic will be forwarded to a blackhole if the state changes to duplicate.
C. The MAC address will be changed to 00:00:00:00:DE:AD if the state changes to duplicate.
D. The state is pending because this MAC address was originally associated with a different IP address.

Answer: A

Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
Proxy ARP in a Layer 2 EVPN service allows the leaf to answer ARP requests locally using learned IP/MAC bindings, reducing broadcast flooding across the overlay. SR Linux can also monitor IP duplication and MAC/IP inconsistencies in the proxy ARP table. A pending state indicates that the system has detected suspicious or conflicting information and is monitoring the binding before declaring it duplicate. If the entry becomes duplicate, SR Linux can use a blackhole behavior to prevent forwarding traffic toward a conflicted endpoint, and a special discard MAC such as 00:00:00:00:DE:AD can be associated with the duplicate entry. Option D is false because it incorrectly states that all traffic destined to 192.168.100.1 will be discarded for exactly 9 minutes. The exhibit references monitoring and hold-down behavior, but the answer key rejects the fixed "9 minutes" traffic-discard statement. The key concept is that duplicate handling protects the EVPN service from unstable or conflicting IP/MAC bindings, but the specific discard duration in option D is not correct. Reference: proxy ARP, IP duplication monitoring, duplicate-state blackhole behavior.

NEW QUESTION # 31
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?

A. Allows the other PEs to discover which PEs are connected to the same Ethernet segment.
B. Identifies the redundancy mode of the Ethernet segment.
C. Identifies the type of algorithm to be used in the election process.
D. Triggers the election of a designated forwarder.

Answer: C

NEW QUESTION # 32
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