Which one of these is a basic firewall?

A.
Packet Filtering Firewalls

B.
Proxy Firewalls

C.
All of the above

D.
None of the above

Explanation:
Packet Filtering Firewall – only examines an IP packet based on Source IP (SIP),
Destination IP (DIP), Source Port and Destination Port for both UDP and TCP by subjecting each
IP packet to an Access Control List.