Pass the Nokia Nokia Certified Data Center Fabric Professional 4A0-D01 Questions and answers with CertsForce

Comprehensive and Detailed Explanation From Exact Extract:

Option A: TRUE – SR Linux leverages an unmodified Linux kernel for broad third-party compatibility.

"SR Linux uses a standard, unmodified Linux kernel, enabling seamless integration of third-party applications."

— Nokia SR Linux Technical Overview, "Linux Foundation"

Option B: TRUE – Its state-driven architecture (centered on the Interface Database) enables efficient data access.

"The state-driven architecture provides applications with granular, real-time access to system state via the IDB."

— SR Linux Architecture White Paper, "State-Driven Design"

Option C: TRUE – The NetOps Development Kit (NDK) (not "NetOgs") supports third-party app integration.

"The NetOps Development Kit (NDK) offers tools and libraries for third-party application development and integration."

— SR Linux DevOps Guide, "NDK Overview"

Option D: FALSE – SNMP is not used for CLI access. SR Linux uses gNMI, JSON-RPC, or SSH/CLI.

"SR Linux CLI is accessed via SSH or modern interfaces (gNMI/JSON-RPC). SNMP is supported only for legacy monitoring, not CLI interaction."

— SR Linux Management Interfaces Guide, "Protocol Support"

Conclusion: Option D is incorrect as SNMP is not a CLI access method.

Comprehensive and Detailed Explanation with Exact Extracts:

Option A (TRUE): Type 1 routes enable multi-homing functions.

Extract from Nokia EVPN Multi-Homing Guide:

"Type 1 Ethernet A-D routes signal reachability for an Ethernet Segment (ES) and enable fast convergence/aliasing in multi-homing."

Option B (TRUE): Type 4 routes facilitate DF election.

Extract from Nokia EVPN Fundamentals Guide:

"Type 4 Ethernet Segment routes advertise ESI and VTEP IP to peers for Designated Forwarder (DF) election, which prevents BUM traffic loops."

Option C (FALSE): The ESI is globally unique, not locally significant.

Extract from Nokia SR Linux Configuration Guide (Section: EVPN ESI):

"The ESI must be unique network-wide and consistently configured on all leafs attached to the same multi-homed device. It is not locally significant."

Option D (TRUE): An ES defines the host connectivity model.

Extract from Nokia EVPN Multi-Homing Guide:

"An Ethernet Segment (ES) is a set of links connecting a single host (e.g., server) to one or more leafs for redundancy/load balancing."

Comprehensive and Detailed Explanation with Exact Extracts:

Option A (TRUE): VTEPs (VXLAN Tunnel Endpoints) are deployed flexibly.

Extract from Nokia VXLAN Configuration Guide:

"VTEPs can reside on hypervisors (virtual switches), leaf routers (network-based overlays), or data center gateways (for inter-fabric connectivity)."

Option B (TRUE): EVPN is the control plane for VXLAN.

Extract from Nokia EVPN-VXLAN Integration Guide:

"EVPN route types (e.g., Type 2 MAC/IP, Type 3 Inclusive Multicast) are exchanged between VTEPs to establish forwarding semantics for the VXLAN overlay."

Option C (FALSE): The VNI (VXLAN Network Identifier) is not automatically assigned per VTEP.

Extract from Nokia SR Linux Fundamentals Guide (Section: VXLAN):

"The VNI is a manually configured 24-bit segment ID per Layer 2 domain (or VRF for L3VNI). A single VTEP handles multiple VNIs simultaneously. VTEPs are identified by IP addresses, not VNIs."

Option D (TRUE): VXLAN enables L2 extension over IP underlays.

Extract from Nokia Data Center Design Guide:

"VXLAN encapsulation provides Layer 2 connectivity between workloads (e.g., VMs, containers) across a routed underlay network."

Comprehensive and Detailed Explanation From Exact Extract:

BGP is widely adopted in data center fabrics due to its scalability, multiprotocol support, and maturity. However, option B is incorrect because BGP does not automatically discover neighbors. Unlike link-state protocols (e.g., OSPF, IS-IS), which use multicast for neighbor discovery, BGP requires manual configuration of peers via IP addresses. This is explicitly stated in Nokia's documentation:

"BGP requires explicit configuration of neighbors. It does not support automatic neighbor discovery via multicast/broadcast mechanisms."

— Nokia SR Linux Configuration Guide, Section: "BGP in Data Center Underlays"

Validation of Other Options:

A: Correct. BGP scales more efficiently in large data centers than link-state protocols. Per Nokia:

"BGP’s path-vector design reduces control-plane overhead compared to link-state protocols, making it optimal for large-scale data center underlays."

— Nokia Data Center Fabric Design Guide

C: Correct. BGP’s maturity is a key advantage:

"BGP’s decades of deployment and extensive vendor interoperability make it a reliable choice for fabric underlays."

— SR Linux EVPN Services Guide

D: Correct. BGP natively supports multi-protocol extensions (MP-BGP) for IPv4/IPv6:

"MP-BGP enables simultaneous transport of IPv4 and IPv6 routes via the same BGP session."

— SR Linux Routing Protocols Handbook

Conclusion:

Option B is the only choice that misrepresents BGP functionality, as neighbor auto-discovery is not a feature of BGP. This distinction is critical in Nokia SR Linux fabric deployments.

Comprehensive and Detailed Explanation From Exact Extract:

In a leaf-spine Clos network:

Option A is TRUE: Each leaf connects to every spine for full redundancy and non-blocking fabric.

"In a Clos topology, every leaf node connects to every spine node, ensuring any-to-any connectivity."

— Nokia Data Center Fabric Design Guide, "Leaf-Spine Architecture"

Option B is TRUE: East-west traffic flows predictably via spines.

"Leaf-spine provides deterministic paths for east-west traffic, minimizing latency and jitter."

— Nokia SR Linux EVPN Configuration Guide, "Traffic Flow in Clos Networks"

Option C is FALSE: Clos networks do not use STP. They rely on Layer 3 ECMP and routing protocols for loop avoidance.

"Clos fabrics eliminate STP by design. Forwarding loops are avoided through ECMP and routing protocols (e.g., BGP), not Layer 2 STP."

— Nokia Data Center Fabric Best Practices, "Loop Avoidance"

Option D is TRUE: ECMP load-balances traffic across multiple spine paths.

"ECMP is fundamental to leaf-spine, distributing traffic across all available spine links."

— Nokia SR Linux Routing Guide, "ECMP in Clos Fabrics"

Comprehensive and Detailed Explanation with Exact Extracts:

Options A, B, and C ARE configured in static-routes:

Blackhole: Configured under static-routes for a prefix to drop traffic.

IPv4 destination prefix: Defined directly in the static-routes container.

Preference value: Set per static route entry within static-routes.

Extract from Nokia SR Linux Configuration Guide (Section: Static Routes):

"Static routes are configured under /routing-policy/static-routes. Each entry requires a prefix (e.g., 0.0.0.0/0). The blackhole parameter and preference value are configured directly within this container for a specific prefix."

Option D (Next-hop group) CANNOT be configured in static-routes:

Next-hop groups are separate objects defined under /routing-policy/next-hop-groups.

The static-routes container references a next-hop group by name but does not define its properties.

Extract from Nokia SR Linux Configuration Guide (Section: Next-Hop Groups):

"Next-hop groups are configured under /routing-policy/next-hop-groups. Each group is given a name and defines properties like next-hop IPs, blackhole behavior, or indirect settings. Static routes reference a next-hop group via the next-hop-group parameter under /routing-policy/static-routes but do not configure the group itself here."

The "baseline diff" command is used to compare the candidate configuration against the baseline datastore to see changes or conflicts, especially when multiple users are involved or to verify differences. It does not indicate that the user is unable to commit changes.

Comprehensive and Detailed Explanation From Exact Extract:

Option A: TRUE – Fabric intent is declaratively defined in YAML.

"FSS uses YAML-based declarative intent to define and manage fabric configurations."

— Nokia Fabric Services System User Guide, "Intent-Based Fabric"

Option B: FALSE – The Digital Sandbox is for pre-deployment validation, not performance monitoring.

"The Digital Sandbox simulates configurations for validation before deployment. Performance monitoring is handled by telemetry analytics, not the sandbox."

— Nokia FSS Deployment Guide, "Digital Sandbox"

Option C: TRUE – Telemetry is contextualized with intent.

"Telemetry data is correlated with fabric intent, providing context-aware insights."

— Nokia FSS Operations Guide, "Telemetry and Analytics"

Option D: TRUE – FSS is cloud-native for flexible integration.

"FSS’s cloud-native microservices architecture simplifies integration with customer ecosystems."

— Nokia FSS Architecture White Paper, "Cloud-Native Design"

Conclusion: Option B misrepresents the Digital Sandbox’s purpose.

Comprehensive and Detailed Explanation From Exact Extract:

Option A: TRUE – "duplicate" status confirms multiple interfaces.

"A 'duplicate' entry indicates the MAC was detected on multiple ports."

— SR Linux Bridge Table Guide, "Duplicate MAC Handling"

Option B: FALSE – No re-learning rate data is present. The output shows a static duplicate entry, not rate violations.

"MAC re-learning rate thresholds generate specific alerts (not shown here). This exhibit only shows a persistent duplicate state."

— SR Linux Monitoring Guide, "MAC Mobility Events"

Option C: TRUE – The MAC is explicitly bound to ethernet-1/10.0.

"The 'Destination' column specifies the interface where the MAC was last observed."

— SR Linux CLI Reference, "show bridge-table"

Option D: TRUE – Duplicate detection is active since duplicates are flagged.

"The presence of 'duplicate' entries confirms MAC duplication detection is enabled."

— SR Linux Security Guide, "MAC Duplication"

Conclusion: Option B is unsupported by the exhibit.

Comprehensive and Detailed Explanation with Exact Extracts:

Option A is FALSE: The provisioning script URL is not defined in the TLS profile. It is provided via DHCP (option 239) or DNS.

Extract from Nokia SR Linux ZTP Guide:

"The DHCP server supplies the URL to the provisioning script (via option 239). TLS profiles secure script/image downloads but do not define the script location."

Options B, C, and D are TRUE:

B: ZTP is managed by the ztp application in the management container.

C: DHCP provides initial IP/gateway.

D: ZTP requires no manual configuration.

Extract from Nokia SR Linux Installation Guide:

"The ZTP application automates deployment. It uses DHCP for network parameters and fetches scripts to make the device operational without pre-configuration."