Quiz on Availability in Software Systems

What does availability refer to in software systems?

• The security of the software

• The amount of data processed

• The readiness of the software for carrying out a task

• The speed of the software

Which of the following is a cause of system failure?

• Fault

• Service Level Agreement

• Recovery

• Security

What is the SLA percentage guaranteed by Amazon for AWS?

• 99.99%

• 95.00%

• 90.00%

• 100.00%

What does the term 'unavailability' mean in the context of Amazon's SLA?

• All running instances have external connectivity

• The system is under maintenance

• All attached volumes perform zero read write IO

• The system is fully operational

What is hazard analysis used for?

• To categorize hazards based on severity

• To monitor system performance

• To recover from faults

• To increase system speed

Which of the following is a fault detection tactic?

• Rollback

• Ignore faulty behavior

• Ping/echo

• Active redundancy

What does the 'heartbeat' tactic do?

• Sends periodic messages to check responsiveness

• Monitors the state of health of a system

• Records system faults

• Checks the validity of operations

What is the purpose of exception handling in fault recovery?

• To ignore all faults

• To prevent all failures

• To handle detected exceptions appropriately

• To increase system speed

What does the degradation tactic aim to do?

• Increase system performance

• Maintain all system functions

• Ignore all faults

• Drop less critical functions during failures

Which tactic involves running procedures to test components?

• Self-test

• Exception detection

• Sanity checking

• Fault tree analysis