AWS VPC MCQs with Detailed Answers (60 Questions) – AWS Cloud Architect Associate 2026 Guide - By EduArn.com

 

Introduction: Why AWS VPC is the MOST Important Topic in Certification

If you ask any certified cloud architect:

👉 “What’s the hardest part of AWS?”

Most will say:
“Networking. Especially VPC.”

Because:

• It’s scenario-based
• It tests architecture thinking
• It impacts security + cost + performance

💡 And here’s the truth:

👉 If you master VPC, you can clear 40% of the exam confidently.

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📊 Industry Insight

• 80% of cloud architectures depend on VPC design
• Security breaches often come from misconfigured networks
• Companies prioritize engineers who understand networking deeply

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🧩 SECTION 1: VPC Fundamentals (1–20)

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1. What is a VPC?

A. Physical network
B. Virtual private cloud
C. Storage system
D. Firewall

✅ Answer: B
💡 Why: VPC is a logically isolated network in AWS.
📌 Example: You create 10.0.0.0/16 for your company network.

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2. What does CIDR define?

A. Security
B. IP range
C. Routing
D. DNS

✅ Answer: B
💡 Defines IP address range.
📌 Example: /16 = 65,536 IPs

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3. Subnet is:

✅ Logical division of VPC
💡 Used to organize resources.

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4. VPC is scoped to:

A. AZ
B. Region
C. Instance
D. Global

✅ Answer: B

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5. Subnet is scoped to:

✅ Availability Zone

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6. Public subnet requires:

✅ Route to Internet Gateway

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7. Private subnet:

✅ No direct internet route

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8. Internet Gateway (IGW):

✅ Connects VPC to internet

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9. Route table:

✅ Controls traffic flow

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10. Elastic IP:

✅ Static public IP

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11. Default VPC:

✅ Comes pre-configured

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12. VPC supports IPv6?

✅ Yes

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13. Max CIDR size:

✅ /16

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14. Min CIDR size:

✅ /28

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15. VPC peering allows:

✅ Private communication

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16. Peering is transitive?

❌ No

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17. Subnets can span AZs?

❌ No

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18. VPC spans AZs?

✅ Yes

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19. Default SG inbound:

❌ Deny

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20. Default SG outbound:

✅ Allow

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⚙️ SECTION 2: Routing & Connectivity (21–40)

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21. 0.0.0.0/0 means:

All traffic

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22. NAT Gateway purpose:

Private subnet → internet

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23. NAT Gateway placed in:

Public subnet

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24. IGW attaches to:

VPC

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25. Route priority:

Longest prefix wins

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26. Private subnet route:

0.0.0.0 → NAT

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27. Public subnet route:

0.0.0.0 → IGW

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28. VPC endpoint:

Private AWS access

📌 Example: S3 without internet

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29. Gateway endpoint supports:

S3, DynamoDB

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30. Interface endpoint uses:

ENI

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31. VPN connects:

On-prem → AWS

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32. Direct Connect:

Dedicated connection

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33. VPC peering supports cross-region?

✅ Yes

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34. Overlapping CIDR allowed?

❌ No

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35. One route table per subnet?

✅ Yes

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36. Multiple subnets share route table?

✅ Yes

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37. DNS resolution enabled by default?

✅ Yes

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38. Route tables control inbound?

❌ No (routing only)

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39. Internet access path:

Instance → Route → IGW

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40. NAT supports inbound traffic?

❌ No

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🔐 SECTION 3: Security (41–60)

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41. Security Groups are:

✅ Stateful

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42. NACLs are:

✅ Stateless

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43. SG applies to:

Instance

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44. NACL applies to:

Subnet

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45. SG supports deny?

❌ No

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46. NACL supports deny?

✅ Yes

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47. Ephemeral ports:

1024–65535

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48. Bastion host:

Secure SSH access

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49. Private EC2 access:

Via bastion

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50. Flow logs capture:

Network traffic

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51. Flow logs stored in:

S3 / CloudWatch

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52. Least privilege principle:

Minimal access

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53. Public DB best practice:

❌ Avoid

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54. Secure architecture:

Public + private subnets

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55. Encryption handled by:

AWS services

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56. Multi-AZ improves:

Availability

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57. Load balancer placed in:

Public subnet

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58. App servers placed in:

Private subnet

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59. DB placed in:

Private subnet

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60. Best VPC design:

• Multi-AZ
• Private DB
• NAT + IGW
• Least privilege

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🧠 Real-World Scenario

A company wants:

• Secure app
• High availability
• Internet-facing website

✔ Solution:

• Public subnet (ALB)
• Private subnet (App + DB)
• NAT Gateway
• Multi-AZ

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⚠️ Common Mistakes

❌ Putting DB in public subnet
❌ Missing route tables
❌ Misusing security groups
❌ Not understanding NAT vs IGW

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🏢 Corporate Angle

Companies struggle with:

• Secure network design
• Cost optimization
• Compliance

👉 At EduArn, we train teams on real-world VPC architecture

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📈 Career Growth

Mastering VPC → Roles:

• Cloud Architect
• DevOps Engineer
• Network Engineer

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🔮 Future Trends (2026+)

• AI-driven networking
• Zero trust architecture
• Multi-cloud networking
• Automated VPC design

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🎯 Call To Action (EduArn)

🚀 Want to master AWS VPC and crack certification?

👉 Visit: https://Eduarn.com
👉 Join AWS + DevOps training
👉 Contact for corporate training

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❓ 6. FAQs

1. Is VPC important for AWS exam?

Yes—covers major portion.

2. NAT vs IGW?

IGW = inbound/outbound
NAT = outbound only

3. SG vs NACL?

SG = stateful
NACL = stateless

4. Best subnet design?

Public + Private

5. How to practice?

Hands-on labs

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🔑 7. Keywords

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