CPEH-001 Question #190: Real Exam Question with Answer & Explanation

The correct answer is A. Transport layer port numbers and application layer headers. Newer firewalls can filter traffic based on many packet attributes like source IP address, source port, destination IP address or transport layer port, destination service like WWW or FTP. They can filter based on protocols, TTL values, netblock of originator, of the source, and

Question

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

Options

ATransport layer port numbers and application layer headers
BPresentation layer headers and the session layer port numbers
CNetwork layer headers and the session layer port numbers
DApplication layer port numbers and the transport layer headers

Explanation

Newer firewalls can filter traffic based on many packet attributes like source IP address, source port, destination IP address or transport layer port, destination service like WWW or FTP. They can filter based on protocols, TTL values, netblock of originator, of the source, and many other Application layer firewalls are responsible for filtering at 3, 4, 5, 7 layer. Because they analyze the application layer headers, most firewall control and filtering is performed actually in the software. https://en.wikipedia.org/wiki/Firewall_(computing)#Network_layer_or_packet_filters

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