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The Nokia 4A0-D01 Data Center Fabric Fundamentals exam is active in 2026 and sits at the foundation of Nokia’s Data Center Fabric Certification program. Nokia lists it as a 90-minute, 40-question exam with no mandatory prerequisite. It contributes to the Data Center Fabric Professional, Data Center Fabric Network Expert, and SR Linux Automation Expert credentials.
The associated current course is built around SR Linux and modern data-center design rather than traditional Layer 2 access switching. Nokia emphasizes Layer 3 leaf-spine fabrics, BGP underlays, EVPN-VXLAN overlays, model-driven management, observability, access control, zero-touch provisioning, and the Event Driven Automation platform.
The broader Nokia certifications connect 4A0-D01 with the more advanced SR Linux EVPN and Data Center Interconnect exam. D01 establishes the language and operating model that D03 uses for deeper multihoming and inter-data-center design.
Leaf-spine architectures create predictable paths between endpoints. Leaf switches connect servers and services, while spine switches provide a high-bandwidth routed core. Each leaf typically connects to every spine, producing equal-cost paths and avoiding the large blocked Layer 2 trees common in older designs.
Nokia’s course emphasizes BGP as an underlay routing protocol because it scales well, has clear policy controls, and supports operational models already familiar to many service-provider engineers.
The underlay should be understood independently from the overlay. Its job is to provide reliable IP reachability among fabric nodes and tunnel endpoints. If the underlay is broken, no EVPN or VXLAN service can compensate.
SR Linux exposes configuration and operational state through structured data models. The CLI, gNMI, JSON-RPC, and other programmatic interfaces work against that model rather than each presenting unrelated device logic.
This approach improves automation because structured data is easier to validate and consume than free-form text. It also helps candidates understand why the CLI can display output in table or JSON form and why external tools can configure the same objects programmatically.
A strong D01 candidate should see the CLI as one client of the system’s model, not as the entire management architecture.
SR Linux uses network instances such as IP-VRF and MAC-VRF contexts to organize Layer 3 and Layer 2 forwarding. This supports multi-tenant overlays and clear separation between customer or application environments.
Interfaces and subinterfaces are associated with the appropriate network instance so the platform knows which forwarding table or Ethernet domain should process the traffic.
Candidates should understand the difference between interface state, network-instance state, and overlay-service state. A physical link can be healthy while the VRF or MAC-VRF configuration prevents traffic from reaching the intended destination.
The fabric underlay can use eBGP relationships among leaf and spine devices so routes to loopbacks and infrastructure prefixes are distributed dynamically. Equal-cost multipath can use several spine paths simultaneously.
Operationally, candidates should understand neighbor establishment, advertised prefixes, next-hop reachability, ECMP, and what happens when one spine or link fails.
The underlay should remain simple. Customer or overlay routes do not need to pollute the infrastructure routing domain when the overlay can carry that service information separately.
VXLAN encapsulates tenant traffic across the routed underlay, while EVPN uses BGP to distribute reachability and service information among fabric nodes. Together they let a Layer 3 fabric support multi-tenant Layer 2 and Layer 3 services.
D01 candidates should understand L2 EVPN and L3 EVPN at a foundation level, including how remote MAC or IP information reaches the correct tunnel endpoint and why the underlay does not need to know every tenant prefix.
Deeper multihoming and DCI behavior is covered in 4A0-D03, but the conceptual separation between underlay and overlay begins here.
A modern fabric needs useful telemetry and protection around its control plane. Nokia’s D01 course covers SR Linux logging, traffic-monitoring filters, interface ACLs, system ACLs, and CPM filters.
Candidates should understand the purpose of each layer. Interface ACLs control traffic at data interfaces; control-plane filters protect the routing system itself; capture filters help observe traffic without changing forwarding behavior.
Monitoring should be tied to normal-state baselines. Interface counters, BGP sessions, EVPN routes, CPU, logs, and service state become more useful when the operator knows what healthy output looks like before an incident.
Large data centers can contain many switches, making manual initial configuration slow and inconsistent. Zero-touch provisioning lets a new device discover or receive bootstrap information and obtain the configuration or software state needed to join the managed environment.
The workflow still needs safeguards. Incorrect DHCP, boot URLs, images, certificates, or device identity can cause a switch to fail onboarding or receive the wrong intent.
Candidates should understand the autoboot process conceptually and recognize common ZTP failure points rather than treating zero-touch provisioning as magic.
Nokia’s Event Driven Automation platform is part of the current DCF fundamentals course. It is designed around fabric and service intent, observability, and an automation model that can coordinate the data-center network at system level.
This is related to the wider practice of continuous monitoring: automation should compare desired and actual state continuously rather than push one configuration and assume the network remains correct forever.
Candidates should understand why intent systems become more valuable as the number of switches, services, and changes increases.
Role-based users, TLS profiles, secure APIs, interface filtering, control-plane protection, and tenant separation all contribute to the fabric security model.
A shared physical fabric must prevent one tenant from accidentally or maliciously reaching another tenant’s forwarding context. Management APIs also need protected credentials and encrypted sessions because programmatic access can change many devices quickly.
Security should therefore be built into the operational model, not added after EVPN services are already in production.
Nokia’s current D01 course includes hands-on use of SR Linux, BGP, EVPN, monitoring, ACLs, user management, ZTP, and EDA concepts. Candidates should build a small leaf-spine lab and verify both underlay and overlay state. Practice should include failing a leaf-spine link, observing BGP and ECMP behavior, checking an EVPN route, changing a network-instance assignment, and tracing the resulting traffic path. Because 4A0-D01 remains current and feeds several DCF credentials, Nokia’s live exam and course pages should define the final scope. The durable skill is understanding a data-center fabric as a model-driven routed system in which underlay, overlay, operations, security, and automation are intentionally separated but operationally connected. Fabric design should also account for failure domains. A leaf-spine topology offers path diversity, but the server, rack, power domain, and uplink design determine whether applications truly survive a device failure. Candidates should distinguish “multiple links exist” from “the application has independent usable paths.” Configuration transactions are another model-driven advantage. SR Linux can validate candidate configuration before it becomes active, reducing the risk of leaving a device half-changed. Operators should still understand dependency order: a valid configuration object can be operationally useless when a peer, interface, or route it relies on is missing.
EVPN route targets and import/export policy become important as the number of tenants grows. A route should enter only the MAC-VRF or IP-VRF that owns the service. Broad import policy can create accidental tenant connectivity even when VXLAN tunnels and BGP sessions are technically healthy. Observability should span both underlay and overlay. BGP session state, loopback reachability, interface errors, EVPN route counts, tunnel endpoints, MAC/IP learning, CPU, and logs provide different views of the same service. A dashboard that shows only link state can miss an overlay failure entirely. Lifecycle planning matters because data-center fabrics change frequently. New racks, leaf nodes, tenants, software releases, and automation versions should be introduced with controlled rollout and validation. The fabric is easier to scale when naming, addressing, BGP policy, network-instance templates, and automation intent are standardized before expansion begins. VXLAN Network Identifiers provide the logical segmentation carried across the IP underlay. Candidates should understand that a VNI identifies an overlay context while the outer IP header delivers the encapsulated packet between tunnel endpoints. This separation lets tenants reuse internal addressing without forcing the underlay to understand their topology.
Configuration checkpoints and rollback are valuable in a model-driven operating system. A fabric change should be staged, validated, and committed only when dependencies are ready. When a change has broad scope, automation should apply it in batches and compare actual state with intent before moving to the next group of devices. BGP policy in the fabric should remain intentionally simple. Underlay routing primarily needs infrastructure reachability; overlay EVPN policy primarily needs tenant/service reachability. Mixing customer prefixes into the underlay or infrastructure prefixes into tenant VRFs makes troubleshooting and security harder without providing useful scale. External connectivity is another design boundary. A data-center fabric eventually connects to firewalls, WAN routers, load balancers, or other networks. The candidate should understand where tenant routes leave the fabric, how default or specific routes are imported, and how the boundary preserves tenant isolation. Operational consistency is another reason Nokia emphasizes model-driven management. The same interface or service pattern should be represented predictably across the fabric so automation, monitoring, and human troubleshooting all use the same vocabulary. Local exceptions may solve one immediate problem while making the larger fabric harder to understand and maintain. That consistency is a major operational advantage.
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