Certified Ethical Hacker (CEH v11) — Question 94

You are the Network Admin, and you get a complaint that some of the websites are no longer accessible. You try to ping the servers and find them to be reachable. Then you type the IP address and then you try on the browser, and find it to be accessible. But they are not accessible when you try using the URL.
What may be the problem?

Answer options

• A. Traffic is Blocked on UDP Port 53
• B. Traffic is Blocked on TCP Port 80
• C. Traffic is Blocked on TCP Port 54
• D. Traffic is Blocked on UDP Port 80

Correct answer: A

Explanation

The correct answer is A, as it indicates that DNS queries, which operate over UDP Port 53, are being blocked, preventing URL resolution. Options B and C are incorrect because the websites are reachable via IP, indicating that HTTP (TCP Port 80) isn't blocked. Option D is also wrong since UDP Port 80 is not a standard port used for web traffic.