CISA Practice Question: Information Systems Operations and Business Resilience
This CISA practice question tests your understanding of information systems operations and business resilience. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A multinational corporation is implementing a disaster recovery plan for its critical financial systems. The plan includes off-site backups and redundant hardware. During a recent test, the recovery time objective (RTO) was met, but the recovery point objective (RPO) was exceeded by 30 minutes due to delayed data replication. Which of the following is the BEST action to address this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement synchronous replication to the secondary site.
Option B is correct because synchronous replication ensures data is written to both sites simultaneously, minimizing RPO. Option A is wrong because increasing full backups to every 4 hours still leaves up to 4 hours of potential data loss. Option C is wrong because reducing bandwidth for replication would likely increase the delay further. Option D is wrong because extending the RTO does not address the RPO issue.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Extend the RPO to accommodate the delay.
Why it's wrong here
Extending RPO accepts the risk rather than fixing the root cause; not a best practice.
✓
Implement synchronous replication to the secondary site.
Why this is correct
Synchronous replication ensures near-zero data loss, directly addressing the RPO exceedance.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Reduce the bandwidth for replication to avoid congestion.
Why it's wrong here
Reducing bandwidth would slow replication further, worsening the RPO.
✗
Increase the frequency of full backups to every 4 hours.
Why it's wrong here
Increasing backup frequency reduces RPO but not enough to meet the 30-minute gap; still significant data loss.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISA NAT questions on configuration and troubleshooting.
Information Systems Operations and Business Resilience — This question tests Information Systems Operations and Business Resilience — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement synchronous replication to the secondary site. — Option B is correct because synchronous replication ensures data is written to both sites simultaneously, minimizing RPO. Option A is wrong because increasing full backups to every 4 hours still leaves up to 4 hours of potential data loss. Option C is wrong because reducing bandwidth for replication would likely increase the delay further. Option D is wrong because extending the RTO does not address the RPO issue.
What should I do if I get this CISA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISA NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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