In the previous chapter, we defined a LAN as a network that covered a small geographical area. In contrast, a WAN is one that covers a large geographical area. We can further define this by saying that a WAN is also used to link LANs, and a prime example of this is the internet. Pretty much every resource we access on the internet is located within someone's LAN. Because of the size of the network involved in a WAN, we will usually find parts of the infrastructure are hosted and controlled by third-party service providers.
For the purposes of the MTA exam, the definitions I have used for LAN and WAN should be adhered to. However, in the real world, you will likely find that uses of the terms LAN and WAN are used incorrectly. For example, I once worked for a global company with offices across the world. You can't get much larger. Resources we accessed...