What is network- and host- based firewalls?

Network-based firewalls are hardware or software solutions that examine network traffic and enforce security policies to control traffic flow between networks. They are typically deployed at network perimeters to protect an entire network from external threats. Host-based firewalls are software applications installed on individual computers or servers that protect that specific host from unauthorized access and malicious activity. They control network traffic in and out of the host based on defined rules. Commonly, network-based firewalls protect the overall network, while host-based firewalls provide an extra layer of protection on individual machines.