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Question 342 - SOA-C02 discussion

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A SysOps administrator has set up a new Amazon EC2 instance as a web server in a public subnet. The instance uses HTTP port 80 and HTTPS port 443.

The SysOps administrator has confirmed internet connectivity by downloading operating system updates and software from public repositories. However, the SysOps administrator cannot access the instance from a web browser on the internet.

Which combination of steps should the SysOps administrator take to troubleshoot this issue? (Select THREE.)

A.
Ensure that the inbound rules of the instance's security group allow traffic on ports 80 and 443.
Answers
A.
Ensure that the inbound rules of the instance's security group allow traffic on ports 80 and 443.
B.
Ensure that the outbound rules of the instance's security group allow traffic on ports 80 and 443.
Answers
B.
Ensure that the outbound rules of the instance's security group allow traffic on ports 80 and 443.
C.
Ensure that ephemeral ports 1024-65535 are allowed in the inbound rules of the network ACL that is associated with the instance's subnet.
Answers
C.
Ensure that ephemeral ports 1024-65535 are allowed in the inbound rules of the network ACL that is associated with the instance's subnet.
D.
Ensure that ephemeral ports 1024-65535 are allowed in the outbound rules of the network ACL that is associated with the instance's subnet.
Answers
D.
Ensure that ephemeral ports 1024-65535 are allowed in the outbound rules of the network ACL that is associated with the instance's subnet.
E.
Ensure that the filtering rules for any firewalls that are running on the instance allow inbound traffic on ports 80 and 443.
Answers
E.
Ensure that the filtering rules for any firewalls that are running on the instance allow inbound traffic on ports 80 and 443.
F.
Ensure that AWS WAF is turned on for the instance and is blocking web traffic.
Answers
F.
Ensure that AWS WAF is turned on for the instance and is blocking web traffic.
Suggested answer: A, D, E

Explanation:

When troubleshooting inability to access an EC2 instance from the internet, you should:

A: Verify that the security group rules allow inbound HTTP and HTTPS traffic on ports 80 and 443. Security groups act as a virtual firewall to control the traffic to instances.

D: Check that outbound rules in the network ACL allow traffic for ephemeral ports 1024-65535. This is crucial for return traffic from web requests, which typically use these higher port numbers for responses.

E: Confirm that any software-based firewalls on the instance (such as Windows Firewall or iptables in Linux) are configured to allow inbound traffic on HTTP and HTTPS. These steps will ensure that the web server is correctly configured to receive and respond to web traffic from the internet. AWS provides guidelines on these configurations in their documentation on security groups EC2 Security Groups and network ACLs Network ACLs.

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asked 16/09/2024
Steve Parnell
30 questions
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