Firewall Packet Filtering

B.

The correct answer to the question is B. Packet filtering.

Packet filtering is a firewall technique used to control network traffic by analyzing individual packets of data and allowing or denying them based on a set of predefined rules. Packet filtering can be implemented at the network level or application level, and it can be configured to allow or block traffic based on various criteria, such as source IP address, destination IP address, port number, protocol type, and packet contents.

Packet filtering is one of the simplest and most commonly used firewall techniques. It provides a basic level of security by blocking unwanted traffic and allowing only authorized traffic to enter the network. Packet filtering is effective in preventing certain types of attacks, such as Denial of Service (DoS) attacks, but it has limitations in detecting and blocking more sophisticated attacks, such as malware and advanced persistent threats (APTs).

To summarize, packet filtering is the method used by firewalls to allow or restrict specific types of packets from crossing over the network. It is a simple and effective way to control network traffic, but it has limitations in detecting and preventing more advanced attacks.