CV0-004 Security Practice Question
A cloud engineer is configuring a web application on AWS and needs to ensure that only HTTP and HTTPS traffic from the internet is allowed to reach the EC2 instances. Which AWS service should be used to control inbound traffic at the instance level?
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
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Security Group
Security groups are stateful virtual firewalls that control inbound and outbound traffic at the instance level. Network ACLs operate at the subnet level and are stateless.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Security Group
Why this is correct
Security groups are stateful instance-level firewalls that can allow HTTP/HTTPS inbound traffic.
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AWS Shield
Why it's wrong here
AWS Shield is a DDoS protection service, not used for basic inbound traffic filtering.
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AWS WAF
Why it's wrong here
AWS WAF is a web application firewall that protects against web exploits, not a basic traffic control.
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Network ACL
Why it's wrong here
Network ACLs are stateless and operate at the subnet level, not instance level.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.