Certified Ethical Hacker (CEH v11) — Question 159

What does a firewall check to prevent particular ports and applications from getting packets into an organization?

Answer options

• A. Transport layer port numbers and application layer headers
• B. Presentation layer headers and the session layer port numbers
• C. Network layer headers and the session layer port numbers
• D. Application layer port numbers and the transport layer headers

Correct answer: A

Explanation

The correct answer is A because firewalls primarily analyze transport layer port numbers and application layer headers to manage incoming and outgoing network traffic. Options B, C, and D are incorrect as they refer to incorrect layers or combinations that do not specifically focus on the functions of firewalls.