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Network Implementation →easyMultiple SelectObjective-mapped

ANS-C01 Network Implementation Practice Question

This ANS-C01 practice question tests your understanding of network implementation. 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 of the following are true about AWS VPC security groups? (Choose two.)

A
Rules are evaluated in order, and the first matching rule is applied.
Why wrong: All rules are evaluated; there is no order.
B
They have an implicit deny all rule at the end.
If no rule matches, traffic is denied.
C
They are stateful, meaning return traffic is automatically allowed regardless of outbound rules.
Stateful nature allows return traffic.
D
They support both allow and deny rules.
Why wrong: Security groups only support allow rules.
E
They can be associated with subnets.
Why wrong: Security groups are associated with ENIs, not subnets.

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

✓

They have an implicit deny all rule at the end.

Security groups in AWS VPC are stateful, meaning that if you allow inbound traffic, the corresponding outbound return traffic is automatically permitted, regardless of outbound rules. They also have an implicit deny all rule at the end, so any traffic not explicitly allowed by a rule is denied. This makes options B and C correct.

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.

✗
Rules are evaluated in order, and the first matching rule is applied.
Why it's wrong here
All rules are evaluated; there is no order.
✓
They have an implicit deny all rule at the end.
Why this is correct
If no rule matches, traffic is denied.
Related concept
Read the scenario before looking for a memorised answer.
✓
They are stateful, meaning return traffic is automatically allowed regardless of outbound rules.
Why this is correct
Stateful nature allows return traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
They support both allow and deny rules.
Why it's wrong here
Security groups only support allow rules.
✗
They can be associated with subnets.
Why it's wrong here
Security groups are associated with ENIs, not subnets.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The ANS-C01 exam often tests the misconception that security groups are stateless like network ACLs, or that they support deny rules, or that they are associated with subnets, leading candidates to confuse security groups with network ACLs.

Detailed technical explanation

How to think about this question

Under the hood, security groups act as a virtual firewall at the instance level, using a connection-tracking mechanism to maintain state. For example, if you allow inbound TCP port 443 from the internet, the security group automatically creates a temporary outbound rule to allow the return traffic, even if the outbound rules are restrictive. This stateful behavior is implemented via the AWS hypervisor layer and is not configurable.

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.

Visual reference

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.

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FAQ

Questions learners often ask

What does this ANS-C01 question test?

Network Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: They have an implicit deny all rule at the end. — Security groups in AWS VPC are stateful, meaning that if you allow inbound traffic, the corresponding outbound return traffic is automatically permitted, regardless of outbound rules. They also have an implicit deny all rule at the end, so any traffic not explicitly allowed by a rule is denied. This makes options B and C correct.

What should I do if I get this ANS-C01 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.

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This ANS-C01 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 ANS-C01 exam.