SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company runs a critical web application on EC2 instances behind an Application Load Balancer across three Availability Zones. The application stores session data in an RDS MySQL database. To improve reliability, the company wants to ensure that a single Availability Zone failure does not impact the application's availability. Which combination of actions should the SysOps administrator take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Deploy RDS in Multi-AZ configuration with automatic failover, and enable cross-zone load balancing on the ALB.
Option C is correct because deploying RDS Multi-AZ with automatic failover ensures that database operations continue during an AZ outage. Enabling cross-zone load balancing ensures the ALB can route traffic to healthy instances in other AZs. Option A is wrong because ELB health checks alone do not handle AZ failures. Option B is wrong because increasing instance size does not provide AZ redundancy. Option D is wrong because increasing the Auto Scaling group's desired capacity does not distribute across AZs if not configured.
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.
✗
Configure the ALB to use only healthy instances and enable detailed CloudWatch metrics.
Why it's wrong here
This does not provide AZ redundancy.
✗
Increase the EC2 instance size to handle more traffic in a single AZ.
Why it's wrong here
Single AZ is a single point of failure.
✗
Increase the Auto Scaling group's desired capacity to a larger number.
Why it's wrong here
Without multi-AZ distribution, all instances may be in one AZ.
✓
Deploy RDS in Multi-AZ configuration with automatic failover, and enable cross-zone load balancing on the ALB.
Static NAT maps one inside address to one outside address.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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 SOA-C02 NAT questions on configuration and troubleshooting.
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Deploy RDS in Multi-AZ configuration with automatic failover, and enable cross-zone load balancing on the ALB. — Option C is correct because deploying RDS Multi-AZ with automatic failover ensures that database operations continue during an AZ outage. Enabling cross-zone load balancing ensures the ALB can route traffic to healthy instances in other AZs. Option A is wrong because ELB health checks alone do not handle AZ failures. Option B is wrong because increasing instance size does not provide AZ redundancy. Option D is wrong because increasing the Auto Scaling group's desired capacity does not distribute across AZs if not configured.
What should I do if I get this SOA-C02 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 SOA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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