The DMZ provides a buffer zone between the untrusted public network (Internet) and the resources within the trusted private network (LAN) that the company is trying to protect. Most companies use firewalls to restrict access to their networks from the Internet, or to restrict one internal network segment from accessing another internal network segment, or to set up demilitarized zones (DMZ)-a small isolated network segment that sits between the protected and unprotected network. The term firewall just as the name implies, originally referred to a fire-resistant wall used to prevent the spread of fire to adjacent buildings, but the concept was applied to network security during the early days of the internet.įirewalls are important because they have become the key foundational element in modern network security in both corporate and consumer settings. It can be described as a “choke point” in the network because all traffic flows in and through it for the purpose of inspection.
A firewall is a network security system or device that monitors and controls incoming and outgoing network traffic and decides whether to allow or block specific traffic based on predefined security rules. It is in fact an important concept when it comes to network security. One of the best defense mechanisms against cyber attacks is the Firewall. What is a network firewall and why do we need one?
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