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  1. Home
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Nokia 4A0-D01 Exam (page: 1)
Nokia Data Center Fabric Fundamentals
Updated on: 26-Oct-2025

Viewing Page 1 of 6
4A0-D01 PDF 35 Questions

Which of the following is NOT one of the reasons why BGP is used as the routing protocol in the data center?

  1. It is more efficient than link-state protocols like IS-IS and OSPF.
  2. BGP neighbors automatically discover each other.
  3. It is a well understood and mature routing protocol.
  4. It supports both IPv4 and IPv6.

Answer(s): A

Explanation:

BGP is not chosen because it is more efficient than link-state protocols; in fact, link-state protocols like IS-IS and OSPF generally provide faster convergence and more efficient route calculation. BGP is used in data centers mainly because it is mature, well understood, supports both IPv4 and IPv6, and offers flexible policy control.



Which of the following statements about the data center's leaf-spine topology (clos network) is FALSE?

  1. Each leaf router is connected to all the spine routers in the cluster.
  2. It provides a consistent path for east-west traffic.
  3. It uses the spanning tree protocol to avoid forwarding loops.
  4. It uses ECMP to distribute traffic across duplicate links.

Answer(s): C

Explanation:

The leaf-spine (Clos) topology does not use the spanning tree protocol because it relies on equal-cost multipath (ECMP) routing to prevent loops and efficiently utilize all available paths. Spanning tree is typically avoided in modern data center fabrics to enable full bandwidth utilization.



Which of the following is NOT a function of Nokia's SR Linux application manager?

  1. It monitors the health of all applications.
  2. It manages the SR Linux and customer-defined applications.
  3. It reads the application's configuration information and starts each application.
  4. It translates the application's YANG model into protobufs for the IDB.

Answer(s): D

Explanation:

The SR Linux application manager does not perform the function of translating an application's YANG model into protobufs for the Interface DataBase (IDB). Its primary roles are managing applications, reading their configuration, and monitoring their health.



Which of the following statements about the YANG model used in Nokia's SR Linux is FALSE?

  1. All configuration and state information is defined as a YANG model.
  2. The YANG model uses a tree structure with "leafs" as the branches and "containers" as the data components.
  3. The YANG model can be converted into other formats such as JSON or XML.
  4. The YANG model provides a standardized way for applications to retrieve SR Linux configuration and state information.

Answer(s): B

Explanation:

In YANG models, "leafs" are the data nodes (not branches), and "containers" group related data nodes. The statement incorrectly reverses their roles by calling leafs branches and containers data components.



Which of the following is NOT one of the characteristics of Nokia's SR Linux?

  1. It uses an unmodified Linux kernel that simplifies the use of third party applications.
  2. It uses a modular, state-driven architecture that gives applications efficient access to system information.
  3. It includes a NetOgs development kit that supports the integration of third-party applications.
  4. It uses mature and stable SNMP protocol to access the command line interface.

Answer(s): D

Explanation:

Nokia's SR Linux does not rely on the SNMP protocol for accessing the command line interface; instead, it uses modern, programmable interfaces aligned with its modular architecture.



Which of the following statements about Nokia's Fabric Services System is FALSE?

  1. Data center fabric configuration is represented as the fabric intent in a declarative YAML format.
  2. Digital sandbox provides notification of performance issues in the data center fabric.
  3. Telemetry data is provided in a context that is relevant to the fabric intent.
  4. Cloud-native design enables easy integration with the customer's environment.

Answer(s): B

Explanation:

The Digital Sandbox in Nokia's Fabric Services System is primarily used for simulation and validation of fabric intent, not for providing notifications of performance issues.



Which of the following statements about configuration checkpoints in Nokia SR Linux is FALSE?

  1. Checkpoint 0 is always the oldest checkpoint.
  2. The current running configuration can be saved as a JSON-formatted checkpoint file.
  3. The operator can revert to any existing checkpoint.
  4. The operator can generate a new checkpoint when committing configuration changes.

Answer(s): A

Explanation:

In Nokia SR Linux, checkpoint numbering is dynamic. The system assigns the lowest available number to the most recent checkpoint, not necessarily "0." When the number of saved checkpoints exceeds the configured maximum, the oldest checkpoint is removed, and the remaining checkpoints are renumbered accordingly. Therefore, checkpoint "0" is not always the oldest checkpoint.



Which of the following statements about the CLI modes in Nokia's SR Linux is FALSE?

  1. The state mode displays the current configuration and operational information.
  2. The show mode uses pre-defined reports to display operational information.
  3. The running mode is used to make configuration changes.
  4. Users can switch from one mode to another using the enter command.

Answer(s): D

Explanation:

In Nokia SR Linux, users switch between CLI modes using specific commands like configure or exit,

not an enter command. The enter command is not used for mode switching.



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