AWS Certified SysOps Administrator – Associate (legacy) — Question 435

What is a security group in Amazon AWS?

Answer options

• A. A UNIX Group that gives permission to edit security settings
• B. An authorized group of instances that control access to other resources
• C. A virtual firewall that controls the traffic for one or more instances
• D. An Access Control List (ACL) for AWS resources

Correct answer: C

Explanation

In Amazon AWS, a security group acts as a virtual firewall that controls inbound and outbound traffic at the instance level. It is not a UNIX group, nor is it a Network Access Control List (NACL), which operates at the subnet level instead of the instance level.