Randall

An NSG is a firewall that is specifically designed to allow access to certain services and applications from outside the network. An NSG is different from a firewall in that it is not meant to protect the network from unauthorized access.

A firewall is a device or system that protects computers and networks from unauthorized access, either by blocking incoming traffic or by allowing selected traffic through. A firewall can be either hardware or software based.

The two main types of firewalls are network firewalls and host firewalls. A network firewall is a device that sits between the network and your computer, and it protects your computer by preventing unauthorized access to your network.

A host firewall is a device that sits on your computer and protects it from unauthorized access from the internet. .

There are two main types of network firewalls: layer 2 and layer 3. A layer 2 network firewall protects your computer by blocking all incoming traffic on the network. This type of firewall is usually found in small businesses that have a single networked computer.

A layer 3 network firewall protects your computer by allowing selected traffic through. This type of firewall is usually found in large businesses that have multiple networks.

A firewall can also be classified by the type of security it provides. A perimeter firewall protects the entire network by blocking all traffic that isn’t authorized.

A gateway firewall protects a single computer by allowing authorized traffic from the rest of the network. A host-based firewall protects a single computer by allowing authorized traffic from the internet.

A firewall can also be classified by the type of protocol it protects. A packet firewall protects all traffic by blocking all non-secure packets.

A stateful firewall protects traffic by tracking the packets as they travel through the firewall. A rule-based firewall allows administrators to create rules that protect specific types of traffic.