Redundancy and failover design in SCADA systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the primary server in a redundant SCADA setup.

SCADA systems

primary_server = '[1]'

Drag options to blanks, or click blank then click option'

A10.0.0.1

B192.168.1.10

C192.168.1.100

Dlocalhost

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing localhost instead of the actual IP address.

The primary server IP is set to 192.168.1.100 as the main SCADA controller.

2fill in blank

medium

Complete the code to set the failover timeout in seconds.

SCADA systems

failover_timeout = [1]

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A60

B10

C30

D120

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the timeout too low causing frequent failovers.

The failover timeout is set to 60 seconds to allow stable switching.

3fill in blank

hard

Fix the error in the failover check function by completing the missing condition.

SCADA systems

if current_server_status == 'down' and [1]:
    switch_to_backup()

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Abackup_server_status == 'down'

Bbackup_server_status == 'up'

Cprimary_server_status == 'up'

Dnetwork_status == 'down'

Attempts:

3 left

💡 Hint

Common Mistakes

Switching when backup server is also down.

The failover should switch only if the backup server is up and ready.

4fill in blank

hard

Fill both blanks to create a dictionary that maps server names to their statuses, filtering only active servers.

SCADA systems

active_servers = {name: status for name, status in servers.items() if status [1] [2]

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A==

B'active'

C'down'

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' causing wrong filtering.

This dictionary comprehension filters servers with status exactly 'active'.

5fill in blank

hard

Fill all three blanks to create a failover log entry with timestamp, server name, and event type.

SCADA systems

failover_log = {'timestamp': [1], 'server': [2], 'event': [3]

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Atime.strftime('%Y-%m-%d %H:%M:%S')

B'primary_server'

C'failover_triggered'

D'backup_server'

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect server name or event string.

The log records the current time, the primary server name, and the failover event.