Metropolitan Area Network
Metropolitan Area Network (MAN). MANs connect two or more local area networks or campus area networks by connecting routers, switches and hubs (will be defined in hardware section), within the area of a single town or city.
Campus Area Network (CAN). A CAN is a connection of LANs within a limited area such as a public school or college campus. This type of network often links academic buildings, the university/school library, or student dorms. It is similar to a MAN because it connects multiple LANs but the difference is that a CAN is usually smaller than a MAN and is specific to an academic setting.
Wide Area Network (WAN). A WAN is a network that covers a broad area; any network that crosses, metropolitan, regional or national boundaries is considered a WAN. A WAN operates by connecting multiple routers and public communications links, such as telephone lines. The most commonly known WAN is the internet, which most of the other computer networks also connect to.
SD-WAN networks allow users to install virtual WAN architecture that allows users, be they clients or internal users from other branches, to access virtual appliances through the internet.