What action should be taken if an EC2 instance is unreachable?

What action should be taken if an EC2 instance is unreachable?

• A. Stop and start the instance
• B. Modify the security group rules
• C. Check the instance status checks
• D. All of the above

Answer: (D)

When an EC2 instance is unreachable, it is important to consider a multifaceted approach to diagnosing and resolving the issue. Stopping and starting the instance can often resolve transient issues. This action effectively reboots the instance, which can help clear up any underlying problems that may be preventing the instance from responding. Modifying the security group rules is also crucial because it addresses potential networking issues. If the rules inadvertently block access, the instance may seem unreachable. Adjusting these rules can restore the necessary traffic flow to and from the instance. Checking the instance status checks is an essential step in troubleshooting. AWS performs automated system checks on the instance, and reviewing the results can indicate whether the instance has passed all checks or if there are underlying hardware or software issues. Thus, taking all of these actions combined provides a comprehensive strategy for diagnosing and potentially resolving the issue of an unreachable EC2 instance. Each step deals with different aspects of what could be causing the accessibility problem, making it a logical collective choice to take all the listed actions.

When an EC2 instance is unreachable, it is important to consider a multifaceted approach to diagnosing and resolving the issue.

Stopping and starting the instance can often resolve transient issues. This action effectively reboots the instance, which can help clear up any underlying problems that may be preventing the instance from responding.

Modifying the security group rules is also crucial because it addresses potential networking issues. If the rules inadvertently block access, the instance may seem unreachable. Adjusting these rules can restore the necessary traffic flow to and from the instance.

Checking the instance status checks is an essential step in troubleshooting. AWS performs automated system checks on the instance, and reviewing the results can indicate whether the instance has passed all checks or if there are underlying hardware or software issues.

Thus, taking all of these actions combined provides a comprehensive strategy for diagnosing and potentially resolving the issue of an unreachable EC2 instance. Each step deals with different aspects of what could be causing the accessibility problem, making it a logical collective choice to take all the listed actions.