AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 147

Your company has just completed a transition to IPv6 and has deployed a website on a server. You were able to download software on the instance without an issue. This website is deployed using IPv6, but the public is not able to access it. What should you do to fix this problem?

Answer options

• A. Add an internet gateway for the instance.
• B. Add an egress-only internet gateway.
• C. Add an inbound rule to your security group that allows inbound traffic on port 80 for ::/0.
• D. Add an inbound rule to your security group that allows inbound traffic on port 80 for 0.0.0.0/0.

Correct answer: C

Explanation

The correct answer is C because it allows inbound traffic from all IPv6 addresses on port 80, which is necessary for HTTP access to the website. Option A is incorrect as an internet gateway is not needed for IPv6 access, while option B is irrelevant because an egress-only internet gateway is used for outbound traffic and does not address inbound access. Option D is also incorrect since it only permits IPv4 traffic, which does not solve the issue for an IPv6 deployed website.