The correct answer is to check the security group outbound rules, because even with a public IP, a public subnet, and a route to an internet gateway, the EC2 instance still needs explicit outbound permission to initiate traffic to the internet. Security groups are stateful, meaning that if you allow inbound traffic, the return flow is automatically permitted, but the reverse is not true—outbound rules must be configured separately for the instance to start a connection outward. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of the difference between network ACLs and security groups, as many candidates mistakenly check inbound rules or the route table first when the real issue is a missing outbound allow rule. A common trap is assuming that a public IP and IGW route guarantee connectivity, but the security group acts as a virtual firewall that can silently drop outgoing packets. Remember the mnemonic: “Out to the internet, outbound must permit it.”
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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.
A SysOps administrator is troubleshooting an issue where an Amazon EC2 instance cannot connect to the internet. The instance is in a public subnet with a route table that has a route to an internet gateway (IGW). The instance has a public IP assigned. What should the administrator check next?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the security group rules to ensure outbound traffic is allowed
The instance has a public IP and is in a public subnet with a route to an IGW, so network-level routing and addressing are already configured. The most common remaining cause for no internet connectivity is that the security group's outbound rules are blocking traffic. Security groups are stateful, so even if inbound rules allow return traffic, outbound rules must explicitly permit the instance to initiate connections to the internet (e.g., outbound HTTPS on port 443 or all traffic).
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Check the security group rules to ensure outbound traffic is allowed
Why this is correct
Security groups are stateful and control outbound traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Verify the network ACL associated with the subnet allows inbound traffic from the internet
Why it's wrong here
The issue is outbound connectivity; inbound rules are for incoming traffic.
✗
Confirm that the route table has a route to the IGW for 0.0.0.0/0
Why it's wrong here
The route is already present.
✗
Ensure the instance has a public IP address
Why it's wrong here
The instance already has a public IP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overlook security group outbound rules because they assume outbound traffic is always allowed by default, but the default security group allows all outbound traffic only if not modified; a custom security group may block outbound traffic, causing internet connectivity failure even with correct routing and public IP.
Detailed technical explanation
How to think about this question
Security groups operate at the instance level and are stateful, meaning that if you allow inbound traffic, the return outbound traffic is automatically permitted, but outbound-initiated traffic must be explicitly allowed in the outbound rules. In contrast, network ACLs are stateless and require explicit rules for both directions. A common real-world scenario is when an instance can receive inbound SSH but cannot download packages from the internet because the security group's outbound rule for ephemeral ports or HTTPS is missing.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the security group rules to ensure outbound traffic is allowed — The instance has a public IP and is in a public subnet with a route to an IGW, so network-level routing and addressing are already configured. The most common remaining cause for no internet connectivity is that the security group's outbound rules are blocking traffic. Security groups are stateful, so even if inbound rules allow return traffic, outbound rules must explicitly permit the instance to initiate connections to the internet (e.g., outbound HTTPS on port 443 or all traffic).
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.