- A
Allow all ICMP traffic from the internet to the VPC.
Why wrong: ICMP can be used for reconnaissance.
- B
Set the default route (0.0.0.0/0) to a virtual private gateway.
Why wrong: Only if VPN is required; otherwise use internet gateway or NAT.
- C
Use a VPC Gateway Endpoint for S3 to allow private access.
Provides secure access to S3 without internet.
- D
Configure Security Groups to allow only required inbound traffic.
Security Groups act as a virtual firewall.
- E
Allow all outbound traffic from the application instances.
Why wrong: Outbound traffic should be restricted to necessary destinations.
Question 577 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO actions should be taken to secure a VPC that hosts a web application? (Choose TWO.)
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
✓
Use a VPC Gateway Endpoint for S3 to allow private access.
To secure a VPC hosting a web application, you should use Security Groups to allow only required inbound traffic (Option D) and use a VPC Gateway Endpoint for S3 to allow private access to S3 without traversing the internet (Option C). Option A is incorrect because allowing all ICMP from the internet increases attack surface. Option B is incorrect because the default route should point to an Internet Gateway for internet access, not a virtual private gateway unless for VPN. Option E is incorrect because allowing all outbound traffic may permit unauthorized data exfiltration.
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.
- ✗
Allow all ICMP traffic from the internet to the VPC.
Why it's wrong here
ICMP can be used for reconnaissance.
- ✗
Set the default route (0.0.0.0/0) to a virtual private gateway.
- ✓
Use a VPC Gateway Endpoint for S3 to allow private access.
Why this is correct
Provides secure access to S3 without internet.
Related concept
Standard ACLs match source addresses.
- ✓
Configure Security Groups to allow only required inbound traffic.
Why this is correct
Security Groups act as a virtual firewall.
Related concept
Standard ACLs match source addresses.
- ✗
Allow all outbound traffic from the application instances.
Why it's wrong here
Outbound traffic should be restricted to necessary destinations.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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 ANS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use a VPC Gateway Endpoint for S3 to allow private access. — To secure a VPC hosting a web application, you should use Security Groups to allow only required inbound traffic (Option D) and use a VPC Gateway Endpoint for S3 to allow private access to S3 without traversing the internet (Option C). Option A is incorrect because allowing all ICMP from the internet increases attack surface. Option B is incorrect because the default route should point to an Internet Gateway for internet access, not a virtual private gateway unless for VPN. Option E is incorrect because allowing all outbound traffic may permit unauthorized data exfiltration.
What should I do if I get this ANS-C01 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 ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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