SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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.
Network Topology
A security engineer runs the command above and finds an ENI attached to a Lambda function. The security group sg-12345678 allows inbound traffic on port 443 from 0.0.0.0/0. The Lambda function is used to process API requests. The engineer is concerned about security. What should the engineer do?
Network Topology
A
Modify the Lambda function to not use a VPC.
Why wrong: This may break functionality if the function needs VPC resources.
B
Add a deny rule for inbound 0.0.0.0/0 and allow only from the Lambda function's own IP.
Why wrong: Lambda functions don't have static IPs without a NAT.
C
Remove the VPC attachment from the Lambda function and use a VPC endpoint.
Why wrong: VPC attachment might be needed for accessing other VPC resources.
D
Restrict the security group source to the API Gateway's VPC endpoint or the ALB security group.
Limits inbound traffic to only the expected source.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Restrict the security group source to the API Gateway's VPC endpoint or the ALB security group.
The correct answer is D because the Lambda function should not be directly accessible from the internet. The security group sg-12345678 currently allows inbound traffic on port 443 from 0.0.0.0/0, which exposes the function to unnecessary risk. The function is intended to process API requests, typically invoked via API Gateway or an ALB. Therefore, the security group should restrict inbound traffic to only the source from the API Gateway's VPC endpoint or the ALB's security group. Option A is incorrect because the Lambda function might need to be in a VPC to access internal resources, and removing VPC attachment is not the best security measure. Option B is incorrect because Lambda functions do not have their own static IP; the ENI's IP is dynamic and cannot be used as a source restriction. More importantly, the source should be the API Gateway, not the Lambda function itself. Option C is incorrect because while using a VPC endpoint is beneficial, simply removing the VPC attachment does not solve the security group issue; the function may still need VPC access. The most direct fix is to modify the security group rule.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Modify the Lambda function to not use a VPC.
Why it's wrong here
This may break functionality if the function needs VPC resources.
✗
Add a deny rule for inbound 0.0.0.0/0 and allow only from the Lambda function's own IP.
Why it's wrong here
Lambda functions don't have static IPs without a NAT.
✗
Remove the VPC attachment from the Lambda function and use a VPC endpoint.
Why it's wrong here
VPC attachment might be needed for accessing other VPC resources.
✓
Restrict the security group source to the API Gateway's VPC endpoint or the ALB security group.
Why this is correct
Limits inbound traffic to only the expected source.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
Cloud Service Model Comparison
Model
You Manage
Provider Manages
Examples
IaaS
OS, runtime, apps, data
Hardware, hypervisor, networking
EC2, Azure VMs, GCP Compute Engine
PaaS
Apps and data
OS, runtime, middleware, hardware
Elastic Beanstalk, Azure App Service
SaaS
Data and settings only
Everything else
Microsoft 365, Salesforce, Workday
FaaS / Serverless
Function code only
Infra, scaling, runtime
Lambda, Azure Functions, Cloud Run
CaaS
Containers and apps
Kubernetes, OS, hardware
EKS, AKS, GKE
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Restrict the security group source to the API Gateway's VPC endpoint or the ALB security group. — The correct answer is D because the Lambda function should not be directly accessible from the internet. The security group sg-12345678 currently allows inbound traffic on port 443 from 0.0.0.0/0, which exposes the function to unnecessary risk. The function is intended to process API requests, typically invoked via API Gateway or an ALB. Therefore, the security group should restrict inbound traffic to only the source from the API Gateway's VPC endpoint or the ALB's security group. Option A is incorrect because the Lambda function might need to be in a VPC to access internal resources, and removing VPC attachment is not the best security measure. Option B is incorrect because Lambda functions do not have their own static IP; the ENI's IP is dynamic and cannot be used as a source restriction. More importantly, the source should be the API Gateway, not the Lambda function itself. Option C is incorrect because while using a VPC endpoint is beneficial, simply removing the VPC attachment does not solve the security group issue; the function may still need VPC access. The most direct fix is to modify the security group rule.
What should I do if I get this SAP-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SAP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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