Cloud SCADA platforms in SCADA systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Cloud SCADA Data Flow

In a typical Cloud SCADA platform, which component is responsible for collecting real-time data from field devices and sending it to the cloud for processing?

A Edge gateway that interfaces with field devices

B Cloud data historian that stores processed data

C Cloud dashboard that visualizes data

D User authentication service managing access

💡 Hint

Think about the device that connects physical sensors to the cloud.

The edge gateway acts as the bridge between field devices and the cloud, collecting data and forwarding it for processing.

💻 Command Output

intermediate

Analyzing Cloud SCADA Service Status Command Output

What is the output of the following command on a Linux server running a Cloud SCADA edge gateway service?

systemctl status scada-edge-gateway

SCADA systems

● scada-edge-gateway.service - SCADA Edge Gateway
   Loaded: loaded (/etc/systemd/system/scada-edge-gateway.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2024-06-14 10:15:30 UTC; 2h 5min ago
 Main PID: 1234 (scada-edge-gateway)
    Tasks: 12 (limit: 4915)
   Memory: 45.0M
   CGroup: /system.slice/scada-edge-gateway.service
           └─1234 /usr/bin/scada-edge-gateway --config /etc/scada/config.yaml

A Service is not found on the system

B Service is inactive and failed to start

C Service is active but in a failed state

D Service is active and running without errors

💡 Hint

Look for the 'Active' line and its status.

The output shows the service is loaded, enabled, and active (running) for over 2 hours, indicating it is working properly.

❓ Configuration

advanced

Configuring Secure MQTT Connection for Cloud SCADA

Which configuration snippet correctly sets up a secure MQTT connection with TLS for a Cloud SCADA edge device?

SCADA systems

mqtt:
  broker: "mqtts://broker.example.com:8883"
  client_id: "edge-device-01"
  tls:
    ca_cert: "/etc/ssl/certs/ca.pem"
    client_cert: "/etc/ssl/certs/client.pem"
    client_key: "/etc/ssl/private/client.key"
  username: "edgeuser"
  password: "edgepass"

A

mqtt:
  broker: "mqtt://broker.example.com:8883"
  tls:
    ca_cert: "/etc/ssl/certs/ca.pem"

B

mqtt:
  broker: "mqtts://broker.example.com:8883"
  tls:
    ca_cert: "/etc/ssl/certs/ca.pem"
    client_cert: "/etc/ssl/certs/client.pem"
    client_key: "/etc/ssl/private/client.key"

C

mqtt:
  broker: "mqtts://broker.example.com:1883"
  tls:
    ca_cert: "/etc/ssl/certs/ca.pem"

D

mqtt:
  broker: "mqtt://broker.example.com:1883"
  tls:
    client_cert: "/etc/ssl/certs/client.pem"
    client_key: "/etc/ssl/private/client.key"

💡 Hint

Secure MQTT uses mqtts protocol and port 8883 by default.

Option B correctly uses mqtts protocol with port 8883 and includes all necessary TLS certificates for secure connection.

❓ Troubleshoot

advanced

Diagnosing Cloud SCADA Data Latency Issue

A Cloud SCADA platform shows delayed data updates from an edge device. Which of the following is the most likely cause based on this log snippet?

2024-06-14 12:00:01 WARN Connection to broker lost, retrying...
2024-06-14 12:00:05 ERROR TLS handshake failed: certificate expired
2024-06-14 12:00:10 INFO Reconnecting to broker

A Network cable unplugged at the edge device

B Cloud dashboard software bug delaying updates

C Expired TLS certificate causing failed secure connection

D Edge device CPU overload causing slow processing

💡 Hint

Look carefully at the error message about TLS handshake.

The log shows a TLS handshake failure due to an expired certificate, which prevents secure connection and causes data delays.

🔀 Workflow

expert

Order the Steps to Deploy a Cloud SCADA Edge Gateway

Arrange the following steps in the correct order to deploy a new Cloud SCADA edge gateway device.

A 2,1,3,4

B 1,2,3,4

C 1,3,2,4

D 3,1,2,4

💡 Hint

Think about preparing the device network before software installation.

First configure network and security, then install software, register device in cloud, and finally test connectivity.