A firewall is the most basic and oldest form of network security. The term has grown gradually in familiar usage to the point where it can be assumed that any conversation about cybersecurity will at least include its mention.
A firewall ideally eliminates, or at least reduces, exposure to external hosts, protocols, and networks that are known to be vectors for network threats. It is the foundation from which current network security technologies build. As the nature of network threats and networks themselves change, the firewall still plays an important role -- albeit alongside other, more recent technologies.
Functions
The primary function of all firewalls is the same: screen network traffic to prevent unauthorized access between computer networks. There are many ways to perform that function, which vary based on the user's needs and the size and state of the user's network. As a result, there are several types of firewalls. The two main types are host-based and network-based.
A host-based firewall is installed on individual servers and monitors incoming and outgoing signals. Network-based firewalls can be built into the cloud's infrastructure or be delivered as a virtual firewall service.
Read more: what is a network firewall and how does it work
A firewall ideally eliminates, or at least reduces, exposure to external hosts, protocols, and networks that are known to be vectors for network threats. It is the foundation from which current network security technologies build. As the nature of network threats and networks themselves change, the firewall still plays an important role -- albeit alongside other, more recent technologies.
Functions
The primary function of all firewalls is the same: screen network traffic to prevent unauthorized access between computer networks. There are many ways to perform that function, which vary based on the user's needs and the size and state of the user's network. As a result, there are several types of firewalls. The two main types are host-based and network-based.
A host-based firewall is installed on individual servers and monitors incoming and outgoing signals. Network-based firewalls can be built into the cloud's infrastructure or be delivered as a virtual firewall service.
Read more: what is a network firewall and how does it work
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