While controlling access to Amazon EC2 resources, which of the following acts as a firewall that controls the traffic allowed to reach one or more instances?

While controlling access to Amazon EC2 resources, which of the following acts as a firewall that controls the traffic allowed to reach one or more instances?
A .  A security group
B .  An instance type
C .  A storage cluster
D .  An object

View Answer

Answer: A

Explanation:

A security group acts as a firewall that controls the traffic allowed to reach one or more instances. When you launch an instance, you assign it one or more security groups.

Reference: http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/UsingIAM.html