A Network Security Firewall acts as a barrier to keep destructive forces away from computers on a network behind the firewall. A network firewall is similar to a physical firewall which prevents a fire from spreading from one area to the other. Firewalls protect against several security threats like denial of service attacks, unauthorized remote logins, and viruses and worms which are spread over a network.
WHAT DO WE UNDERSTAND BY ‘NETWORK SECURITY FIREWALL’?
Firewalls are network security system