Learn about the flexibility and functionality of security groups in cloud computing. Discover how they act as firewalls to safeguard instances and subnets.
Table of Contents
Question
Which of the following statements about security groups are true? (Select TWO.)
A. Security groups can be modified at any time.
B. Security groups can be modified, but a user must stop the instance first.
C. Security groups cannot be modified.
D. Security groups act as a firewall to protect a subnet.
E. Security groups act as a firewall to protect an instance.
Answer
A. Security groups can be modified at any time.
E. Security groups act as a firewall to protect an instance.
Explanation
A security group acts as a firewall at the instance level, not the subnet level. It can be modified without stopping the instance, and the changes apply immediately to every instance that is using that security group.
Security groups in cloud computing serve as virtual firewalls that control inbound and outbound traffic at the instance level. They provide a flexible and effective way to protect instances from unauthorized access.
One of the key advantages of security groups is that they can be modified at any time without the need to stop or restart the instance (Answer A). This allows for quick and seamless adjustments to security settings as requirements change.
While security groups are primarily associated with protecting individual instances (Answer E), they do not directly act as firewalls for entire subnets (Answer D). Subnet-level protection is typically handled by network access control lists (ACLs).
It’s important to note that security group modifications take effect immediately, ensuring that instances are always protected by the most up-to-date security rules (Answer C is incorrect).
In summary, security groups are essential tools for safeguarding instances in cloud computing environments. Their ability to be modified on-the-fly and their role as instance-level firewalls make them a crucial component of a robust security strategy.
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