Objective 3.3

Question 1

What is Recovery Point Objective (RPO)?
- Recovery Time Objective (RTO)
- Recovery Point Objective (RPO)
- Mean Time Between Failures (MTBF)
- Mean Time to Repair (MTTR)

Answer 1

Recovery Point Objective (RPO)
Practical Example: If the RPO is 4 hours, backups must ensure no more than 4 hours of data loss.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How does RPO influence backup frequency?

Question 2

What is Recovery Time Objective (RTO)?
- Recovery Point Objective (RPO)
- Recovery Time Objective (RTO)
- Mean Time Between Failures (MTBF)
- Mean Time to Repair (MTTR)

Answer 2

Recovery Time Objective (RTO)
Practical Example: If the RTO is 2 hours, the business must restore operations within that time.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How does RTO influence DR site selection?

Question 3

What is Mean Time to Repair (MTTR)?
- Mean Time Between Failures (MTBF)
- Mean Time to Repair (MTTR)
- Recovery Point Objective (RPO)
- Recovery Time Objective (RTO)

Answer 3

Mean Time to Repair (MTTR)
Practical Example: A server outage is resolved in 1.5 hours on average.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: Why is a lower MTTR better?

Question 4

What is Mean Time Between Failures (MTBF)?
- Mean Time to Repair (MTTR)
- Mean Time Between Failures (MTBF)
- Recovery Time Objective (RTO)
- Recovery Point Objective (RPO)

Answer 4

Mean Time Between Failures (MTBF)
Practical Example: A router operates for 12,000 hours on average before failing.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How can improving MTBF reduce operational costs?

Question 5

Which statement describes the difference between RPO and RTO?
- Both measure data loss tolerance
- RPO measures downtime tolerance, RTO measures data loss tolerance
- Both measure downtime tolerance
- RPO measures data loss tolerance, RTO measures downtime tolerance

Answer 5

RPO measures data loss tolerance, RTO measures downtime tolerance
Practical Example: RPO relates to backup frequency, RTO relates to restoration time.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How could a low RPO and low RTO affect recovery planning?

Question 6

Which statement describes the difference between MTTR and MTBF?
- Both measure repair time
- MTTR is time between failures, MTBF is repair time
- Both measure time between failures
- MTTR is repair time, MTBF is time between failures

Answer 6

MTTR is repair time, MTBF is time between failures
Practical Example: MTTR is measured after a failure occurs, MTBF is a measure of reliability.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How can MTBF help predict replacement schedules?

Question 7

A company’s RPO is 6 hours. What does this mean?
- No more than 6 hours of data loss is acceptable
- Systems will fail every 6 hours
- Systems must be restored within 6 hours
- Repairs must take less than 6 hours

Answer 7

No more than 6 hours of data loss is acceptable
Practical Example: Backup schedules must ensure data loss never exceeds 6 hours.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What might happen if backups occur every 12 hours instead?

Question 8

A company’s RTO is 2 hours. What does this mean?
- Systems must be restored within 2 hours of downtime
- Systems fail every 2 hours
- No more than 2 hours of data loss is acceptable
- Repairs must take less than 2 hours

Answer 8

Systems must be restored within 2 hours of downtime
Practical Example: Disaster recovery plans must restore systems within 2 hours.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: Which DR site type could meet a 2-hour RTO?

Question 9

A server has an MTTR of 1 hour. What does this mean?
- It fails every hour
- It can only operate for 1 hour after repair
- It takes 1 hour on average to repair the server after failure
- It runs for 1 hour before failing

Answer 9

It takes 1 hour on average to repair the server after failure
Practical Example: Quick repairs reduce downtime.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What strategies can lower MTTR further?

Question 10

A router has an MTBF of 12,000 hours. What does this mean?
- It must be replaced after 12,000 hours
- It will take 12,000 hours to repair
- On average, it will operate 12,000 hours before failure
- It will fail every 12,000 hours exactly

Answer 10

On average, it will operate 12,000 hours before failure
Practical Example: Higher MTBF means greater reliability.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How could preventive maintenance extend MTBF?

Question 11

What is a cold site?
- A site with infrastructure but no equipment until needed
- A standby system ready to activate
- A site with partial equipment
- A fully operational backup site

Answer 11

A site with infrastructure but no equipment until needed
Practical Example: Cheapest DR site option but slowest to activate.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: Why is a cold site less costly than other DR sites?

Question 12

What is a warm site?
- A site with no equipment
- A standby server
- A site partially equipped for faster recovery
- A fully operational backup site

Answer 12

A site partially equipped for faster recovery
Practical Example: Balances cost and recovery speed.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What additional steps are needed to make a warm site operational?

Question 13

What is a hot site?
- A site with partial equipment
- A site with no equipment
- A fully operational backup site ready for immediate use
- A standby system only

Answer 13

A fully operational backup site ready for immediate use
Practical Example: Most expensive option but offers zero downtime failover.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: Which industries most often require hot sites?

Question 14

What is the difference between cold and warm sites?
- Warm sites have some equipment pre-installed, cold sites do not
- Cold sites are faster to activate
- Both have identical readiness
- Cold sites have more equipment than warm sites

Answer 14

Warm sites have some equipment pre-installed, cold sites do not
Practical Example: Warm sites enable faster recovery than cold sites.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How might recovery time differ between cold and warm sites?

Question 15

What is the difference between warm and hot sites?
- Both are identical
- Warm sites are faster to activate than hot sites
- Hot sites are fully operational, warm sites are partially equipped
- Warm sites are fully operational, hot sites are partially equipped

Answer 15

Hot sites are fully operational, warm sites are partially equipped
Practical Example: Hot sites allow immediate failover, warm sites require setup.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: Why might a company choose a warm site over a hot site?

Question 16

Which DR site is cheapest but takes longest to become operational?
- Cold site
- Warm site
- Active-passive site
- Hot site

Answer 16

Cold site
Practical Example: Cold sites lack pre-installed equipment.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: When might a cold site be acceptable despite longer recovery time?

Question 17

Which DR site is fully ready to take over immediately?
- Warm site
- Cold site
- Hot site
- Active-active site

Answer 17

Hot site
Practical Example: Hot sites mirror the primary site.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What is the main cost drawback of a hot site?

Question 18

Which DR site balances cost with recovery speed?
- Hot site
- Warm site
- Cold site
- Active-passive site

Answer 18

Warm site
Practical Example: Warm sites have partial readiness.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How long might a warm site take to activate compared to a hot site?

Question 19

What is an active-active configuration?
- Systems run only during failure
- A site without any active systems
- One system runs while the other is standby
- Both systems run simultaneously, sharing load

Answer 19

Both systems run simultaneously, sharing load
Practical Example: Provides load balancing and redundancy.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What is one complexity of active-active systems?

Question 20

What is an active-passive configuration?
- One system runs while another is on standby
- Both systems run simultaneously
- Systems switch roles periodically
- Both systems are off until needed

Answer 20

One system runs while another is on standby
Practical Example: Simpler than active-active but can involve downtime.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What happens during failover in active-passive setups?

Question 21

What is the difference between active-active and active-passive setups?
- Both operate identically
- Active-passive shares load, active-active has standby only
- Both keep standby systems active
- Active-active shares load, active-passive has standby only

Answer 21

Active-active shares load, active-passive has standby only
Practical Example: Active-active maximizes uptime, active-passive reduces cost.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: When might active-passive be preferred?

Question 22

In which setup do both systems share the load?
- Hot site
- Warm site
- Active-passive
- Active-active

Answer 22

Active-active
Practical Example: Active-active increases performance and redundancy.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: What is a possible drawback of active-active in terms of maintenance?

Question 23

In which setup is one system on standby?
- Active-passive
- Hot site
- Active-active
- Cold site

Answer 23

Active-passive
Practical Example: Active-passive can involve downtime during switchover.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How can downtime in active-passive setups be minimized?

Question 24

What is a tabletop exercise?
- A full failover test
- A discussion-based DR test without real resource activation
- A backup restoration test
- A simulated failover with live systems

Answer 24

A discussion-based DR test without real resource activation
Practical Example: Used to identify gaps in DR plans.
Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts.
Follow-Up Question: How can tabletop exercises improve readiness?

Question 25

What is a validation test? - A simulation without execution - A theory-based plan review - A DR test involving execution of recovery procedures - A discussion-only exercise

Answer 25

A DR test involving execution of recovery procedures Practical Example: Confirms recovery objectives are achievable. Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts. Follow-Up Question: Why are validation tests more resource-intensive?

Question 26

Which DR test involves discussing scenarios without activating systems? - Validation test - Hot site drill - Tabletop exercise - Full system failover

Answer 26

Tabletop exercise Practical Example: Allows low-cost DR planning checks. Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts. Follow-Up Question: How often should tabletop exercises be conducted?

Question 27

Which DR test involves executing the recovery process to verify objectives? - Tabletop exercise - Backup file inspection - Validation test - Walkthrough only

Answer 27

Validation test Practical Example: Ensures systems can be restored to meet RTO and RPO. Exam Objective: CompTIA N10-009 Objective 3.3 – Disaster Recovery Concepts. Follow-Up Question: What risks can be uncovered during validation tests?