Azure networking protection

- [Instructor] The second of the four broad categories … of networking services is called protection. … So how does a network provide protection … to the applications and servers running on that network? … Hopefully you've heard the term firewall before. … Firewall is an extremely broad term … but it's basically a device that blocks traffic … from passing over it unless it meets very specific criteria. … It's often portrayed as a brick wall in networking diagrams. … Each virtual network has a basic firewall feature … called network security groups or NSG. … An NSG is not intelligent at all … and is purely rule-based. … If traffic matches the rule, it passes through. … If it does not, it's denied. … You can block off access to source computers, … destination computers, ports or the method … by which the traffic arrived to your network. … You can also add third party firewall products … to your network from the marketplace, … which are called virtual appliances. … Azure provides a service called DDoS Protection …