How Long Does it Take to Update Security Group Changes in AWS?

Correct Answer - D.

You can assign a security group to an instance when you launch the instance.

When you add or remove rules, those changes are automatically applied to all instances to which you've assigned the security group.

Option A is incorrect.

Any changes made to the Security Group are immediately effected.

Option B is incorrect because you don't need to restart the server to check any Security Group updates.

Option C is incorrect because you can modify rules in the security group.

Option D is CORRECT because any changes made to the security group are taken into effect immediately.

Option E is incorrect because this security group works at the instance level, not at the application level.

Reference:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html#adding-security-group-rule https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/working-with-security-groups.html

When you add a new rule to a security group, it is applied immediately to all the resources associated with that security group. Therefore, the correct answer is D - "Immediately without restart."

Security groups are virtual firewalls that control inbound and outbound traffic to your AWS resources such as EC2 instances. When you add a new rule to a security group, the change takes effect immediately, and it applies to all instances associated with that security group.

However, keep in mind that changes to security group rules may take some time to propagate to all instances in some rare cases. In such cases, the delay may depend on the size of the security group, network latency, and other factors, but it is usually no more than a few minutes.

In summary, you do not need to restart the EC2 server, create a new security group, or redeploy your application. Adding a rule to a security group takes effect immediately and applies to all resources associated with that security group.