Monolithic SCADA architecture in SCADA systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the main drawback of monolithic SCADA architecture

In a monolithic SCADA system, all components are tightly integrated into a single unit. What is the primary disadvantage of this design?

A It makes the system hard to scale and maintain because all parts are interdependent.

B It allows easy replacement of individual components without affecting others.

C It improves fault tolerance by isolating failures to single modules.

D It enables distributed control across multiple physical locations.

💡 Hint

Think about how tightly connected parts affect changes and growth.

Monolithic SCADA systems bundle all functions together, making it difficult to update or scale parts independently. This tight coupling increases maintenance complexity.

💻 Command Output

intermediate

Output of system status command in monolithic SCADA

Given a monolithic SCADA system, the command scada_status --all is run. What output would you expect?

SCADA systems

scada_status --all

A Returns an error because the command is invalid in monolithic systems.

B Displays status of all integrated components in a single report.

C Shows status of only the communication module.

D Outputs status of distributed nodes separately.

💡 Hint

Monolithic means all parts are together, so status commands usually cover everything at once.

The command reports the status of all components since they are integrated in one system, producing a unified status report.

❓ Troubleshoot

advanced

Troubleshooting a failure in monolithic SCADA system

A monolithic SCADA system suddenly stops responding. Which step is the best initial troubleshooting action?

A Check network connections between distributed nodes.

B Isolate and restart only the failed module without affecting others.

C Restart the entire SCADA system to reset all components at once.

D Update the firmware of remote terminal units individually.

💡 Hint

Remember that in monolithic systems, components are tightly coupled.

Because components are tightly integrated, restarting the whole system is often necessary to recover from failures.

🔀 Workflow

advanced

Deploying updates in a monolithic SCADA system

What is the correct workflow to deploy a software update in a monolithic SCADA system?

A Apply updates automatically without backups to minimize downtime.

B Update individual modules one by one while the system runs to avoid downtime.

C Deploy updates only to remote units and leave central system unchanged.

D Schedule downtime, backup the entire system, apply update to all components simultaneously, then test system functionality.

💡 Hint

Consider the risks of updating tightly coupled components.

Because all components are integrated, updates require full system backup and downtime to ensure stability and recovery options.

✅ Best Practice

expert

Best practice to improve scalability in monolithic SCADA architecture

Which approach best improves scalability in a monolithic SCADA system without redesigning it completely?

A Implement load balancing by adding redundant hardware to share the processing load.

B Refactor the system into microservices immediately to separate components.

C Remove legacy modules to reduce system size and complexity.

D Increase polling frequency to speed up data collection.

💡 Hint

Think about ways to handle more work without changing the software structure.

Adding redundant hardware and load balancing helps distribute workload and improve scalability without changing the monolithic design.