We must first understand the differences between a LAN and a WAN. In a LAN, we own our infrastructure, and we have full control of every aspect of it. In a WAN, we must lease the infrastructure from a provider and have little to no control of what happens to our packets as they go through the provider's networks.
Although, in today's modern era of networking, where everything is moving to the cloud and we have services such as PaaS, IaaS, and SaaS, which vary in the amount of control we can have on the software and even the hardware, we still are paying for the services for a provider to take us across to our branch networks or use their software or hardware. One of the issues we face is bandwidth. Luckily for us, our technology has grown to the point where bandwidth is not an issue, if you have the money. Therefore, you really need to understand the...