Certified Ethical Hacker (CEH) — Question 32

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 utilize transport layer port numbers and application layer headers to make decisions about allowing or blocking traffic. The other options include incorrect layer combinations or irrelevant headers that do not play a role in firewall filtering.