← SOA-C02·Amazon Web Services

Question 909 of 1,546

Monitoring, Logging, and Remediation →hardMultiple SelectObjective-mapped

Quick Answer

The correct approach to automatically terminate EC2 instances after 24 hours is to combine an AWS Lambda function, an Amazon EventBridge rule, and instance tags. This solution works because the Lambda function uses the EC2 API to check each instance’s launch time against a 24-hour threshold, the EventBridge rule triggers that function on a scheduled basis (e.g., every hour), and a tag like “LaunchTime” stores the precise start time for the function to evaluate. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of event-driven automation versus monitoring-based solutions—a common trap is selecting CloudWatch alarms, which are designed for metric thresholds (like CPU or memory), not time-based instance lifecycle management. Another pitfall is choosing Auto Scaling lifecycle hooks, which handle instance transitions during scaling events, not arbitrary time-based termination. For a quick memory tip, remember “LET”: Lambda to terminate, EventBridge to trigger, Tags to track time.

SOA-C02 Monitoring, Logging, and Remediation Practice Question

This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 SysOps administrator is tasked with setting up a solution that automatically terminates EC2 instances that have been running for more than 24 hours. Which steps should the administrator take? (Select THREE.)

Question 1hardmulti select

Read the full NAT/PAT explanation →

A
Configure an Auto Scaling group lifecycle hook to terminate instances after 24 hours.
Why wrong: Lifecycle hooks are for transitions, not time-based termination.
B
Create a CloudWatch alarm on the InstanceAge metric and set it to trigger the Lambda function.
Why wrong: InstanceAge is not a standard CloudWatch metric.
C
Tag each EC2 instance with its launch time (e.g., key: LaunchTime, value: timestamp).
Tags allow the Lambda function to calculate age.
D
Create an Amazon EventBridge rule that triggers the Lambda function on a schedule (e.g., every hour).
Scheduled EventBridge rules can invoke Lambda periodically.
E
Create an AWS Lambda function that uses the EC2 API to terminate instances older than 24 hours.
Lambda can run custom code to terminate instances.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Tag each EC2 instance with its launch time (e.g., key: LaunchTime, value: timestamp).

Options A, B, and D are correct. Option A creates a Lambda function to terminate instances. Option B creates an EventBridge rule that triggers the Lambda function. Option D tags instances with a launch time for the function to evaluate. Option C is wrong because CloudWatch alarms are for metric thresholds, not time-based. Option E is wrong because Auto Scaling lifecycle hooks are for lifecycle actions, not time-based termination.

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 an Auto Scaling group lifecycle hook to terminate instances after 24 hours.
Why it's wrong here
Lifecycle hooks are for transitions, not time-based termination.
✗
Create a CloudWatch alarm on the InstanceAge metric and set it to trigger the Lambda function.
Why it's wrong here
InstanceAge is not a standard CloudWatch metric.
✓
Tag each EC2 instance with its launch time (e.g., key: LaunchTime, value: timestamp).
Why this is correct
Tags allow the Lambda function to calculate age.
Related concept
Static NAT maps one inside address to one outside address.
✓
Create an Amazon EventBridge rule that triggers the Lambda function on a schedule (e.g., every hour).
Why this is correct
Scheduled EventBridge rules can invoke Lambda periodically.
Related concept
Static NAT maps one inside address to one outside address.
✓
Create an AWS Lambda function that uses the EC2 API to terminate instances older than 24 hours.
Why this is correct
Lambda can run custom code to terminate instances.
Related concept
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

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Tag each EC2 instance with its launch time (e.g., key: LaunchTime, value: timestamp). — Options A, B, and D are correct. Option A creates a Lambda function to terminate instances. Option B creates an EventBridge rule that triggers the Lambda function. Option D tags instances with a launch time for the function to evaluate. Option C is wrong because CloudWatch alarms are for metric thresholds, not time-based. Option E is wrong because Auto Scaling lifecycle hooks are for lifecycle actions, not time-based termination.

What should I do if I get this SOA-C02 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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