Disaster recovery planning in SCADA systems - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Key Objective of Disaster Recovery Planning

What is the primary goal of disaster recovery planning in SCADA systems?

A To eliminate the need for backups by using redundant hardware only

B To prevent all possible hardware failures from occurring

C To increase the complexity of the system for better security

D To ensure rapid restoration of system operations after a failure

💡 Hint

Think about what disaster recovery aims to achieve after an incident.

The main goal of disaster recovery planning is to restore system operations quickly after a failure or disaster, minimizing downtime and impact.

💻 Command Output

intermediate

Result of Running Backup Verification Script

Given a backup verification script for SCADA system data, what output indicates a successful backup verification?

SCADA systems

echo "Verifying backup integrity..."
if cmp -s /backup/scada_data.bak /data/scada_data; then
  echo "Backup verification successful"
else
  echo "Backup verification failed"
fi

A Backup verification successful

B Permission denied

C Syntax error: unexpected token 'then'

D Backup verification failed

💡 Hint

Look for the message printed when the files match exactly.

If the backup file matches the original data file exactly, the script prints 'Backup verification successful'.

🔀 Workflow

advanced

Correct Order of Disaster Recovery Steps

Arrange the following steps in the correct order for disaster recovery in a SCADA system.

A 1,3,2,4

B 2,1,3,4

C 1,2,3,4

D 3,2,1,4

💡 Hint

Think about what must be done first before restoring hardware or data.

First assess damage, then restore hardware, recover data, and finally test and resume operations.

❓ Troubleshoot

advanced

Identifying Cause of Failed Backup Restore

A SCADA system backup restore fails with the error: 'Permission denied while accessing backup files'. What is the most likely cause?

A User running restore lacks file access permissions

B Backup files are corrupted

C Network connection to backup server is down

D Backup files are missing from the backup location

💡 Hint

Consider what 'Permission denied' usually means in file operations.

'Permission denied' indicates the user or process does not have rights to read the backup files, causing the restore to fail.

✅ Best Practice

expert

Best Practice for Backup Frequency in SCADA Disaster Recovery

Which backup frequency is considered best practice for minimizing data loss in critical SCADA systems?

A Perform incremental backups every 24 hours

B Perform continuous or near-real-time backups

C Perform full backups once a month

D Perform backups only after system updates

💡 Hint

Think about how often data changes and the impact of data loss.

Continuous or near-real-time backups minimize data loss by capturing changes as they happen, which is critical for SCADA systems.