What kind of firewall filters packets based on rules applied to their source and destination?

What kind of firewall filters packets based on rules applied to their source and destination?

• A. Application firewall
• B. Packet filtering firewall
• C. Stateful inspection firewall
• D. Circuit-level firewall

Answer: (B)

A packet filtering firewall operates by examining the headers of packets that are transmitted between devices on a network. It employs a set of predefined rules to determine whether to allow or deny the communication. These rules are based on criteria such as the source IP address, destination IP address, source port, destination port, and the protocol being used (like TCP or UDP). This type of firewall works at the network layer of the OSI model, making decisions quickly and efficiently without maintaining any context or state information about the communications. It is commonly used for basic access control to allow or block traffic and is often the first line of defense in network security. In contrast, application firewalls operate at a higher layer and inspect the payload of packets for specific application-level commands. Stateful inspection firewalls keep track of the state of active connections and make filtering decisions based on this state, which enables them to allow or block traffic more intelligently. Circuit-level firewalls operate at the session layer and monitor TCP handshakes and sessions but do not filter based on packet content. Thus, the characteristics of a packet filtering firewall make it the correct answer to the question regarding filtering packets based on rules applied to their source and destination.

A packet filtering firewall operates by examining the headers of packets that are transmitted between devices on a network. It employs a set of predefined rules to determine whether to allow or deny the communication. These rules are based on criteria such as the source IP address, destination IP address, source port, destination port, and the protocol being used (like TCP or UDP).

This type of firewall works at the network layer of the OSI model, making decisions quickly and efficiently without maintaining any context or state information about the communications. It is commonly used for basic access control to allow or block traffic and is often the first line of defense in network security.

In contrast, application firewalls operate at a higher layer and inspect the payload of packets for specific application-level commands. Stateful inspection firewalls keep track of the state of active connections and make filtering decisions based on this state, which enables them to allow or block traffic more intelligently. Circuit-level firewalls operate at the session layer and monitor TCP handshakes and sessions but do not filter based on packet content.

Thus, the characteristics of a packet filtering firewall make it the correct answer to the question regarding filtering packets based on rules applied to their source and destination.