The main difference between a network-based firewall and a host-based firewall is that a network-based firewall controls traffic passing through the device, while a host-based firewall controls traffic destined for the device. A firewall is a device or a software that filters and regulates the network traffic based on a set of rules or policies, and that blocks or allows the traffic based on the source, destination, protocol, port, or content of the traffic. A network-based firewall is a type of firewall that is deployed at the network perimeter or the network segment, and that controls the traffic that passes through the device, such as the traffic that enters or exits the network, or the traffic that moves between different network zones or subnets. A host-based firewall is a type of firewall that is installed on a specific host or system, such as a server, a workstation, or a mobile device, and that controls the traffic that is destined for the device, such as the traffic that originates from or terminates at the device, or the traffic that is related to the applications or processes running on the device. The other options are not the main difference between a network-based firewall and a host-based firewall, as they either do not describe the characteristics or functions of the firewalls, or do not apply to both types of firewalls. References: CISSP - Certified Information Systems Security Professional, Domain 4.
Communication and Network Security, 4.2 Secure network components, 4.2.2 Implement secure communication channels, 4.2.2.1 Network and host-based firewalls; CISSP Exam Outline, Domain 4.
Communication and Network Security, 4.2 Secure network components, 4.2.2 Implement secure communication channels, 4.2.2.1 Network and host-based firewalls