Firewall guidelines and policies

Abstract

Information systems must be protected by firewalls, which are designed to control traffic flowing between private and
public networks, allowing and denying requests made by the different networks in order to protect them from threats. There
are different types of firewalls that are used depending on the filtering techniques to be implemented, according to the TCP/
IP protocol stack, they can work at network, transport and application level. A good firewall policy design strengthens
network security by controlling certain types of data traffic.