Zones
In networking, when we move data between the internet and a company computer, we do so through three distinct zones:
- Wide Area Network (WAN): A WAN is an external public network that covers a wide geographical area. This is considered an untrusted zone.
- Local Area Network (LAN): A LAN is a network covering a small location such as a building or a company with staff working in close proximity. This is seen as a trusted zone.
- Screened subnet: A screened subnet is a boundary layer owned by a company whose purpose is to protect the company from external hackers. This is a neutral zone that hosts data accessible to people from both the trusted and untrusted zones. An example of this is a mail server. For instance, say Company A (a car manufacturer) has their office staff working from the LAN, but they also have mobile sales staff who travel externally. The company has placed the mail server in the screened subnet so that both office staff and remote users can access...