it 242 1: A WAN or wide area network is a network that supports connectivity outside of a local area network. Some would reference the Internet itself as a WAN and they would probably be correct, your home set up is both a LAN and a WAN all in one as you have a LAN side (your devices internal to your router or modem) and then the connectivity outside of your router (the link from your router out to the Internet through your ISP). An example of a simple WAN is where I work, I work out of a satellite office set apart from the main building. We are both on the same WAN while we each have our own LAN (LANs for their case) for each building. Our LANS are linked together on the companys WAN through coax and fiber lines connecting us to them with plenty of hardware in between. We share a server that handles the accounts as far as authenticating and creating / managing accounts, its located at the main building site but we still access it and utilize it for services. 2: A Wide Area Network (WAN) is an infrastructure made of LANs and MANs that connects to each other over a large geographic area. This can include world wide. A great example of this the Internet. There are many small LANS and MANs to talk to a centrally located area to those networks. Those will then branch off to more of the same network connections and so on. That all eventually connects to each other and forms the WAN. Large businesses that have locations all across the glob will use a WAN to connect all of their servers with each other for seamless operation in the day to day activities. If they have an office on the East coast and an office on the West coast they would be using a WAN which would have to be connected through use of the Internet. Each office would have their own ISP providing internet and switches in each office connecting their staff PCs together and eventually going out to the Internet. 4: Why is it important to follow the order of operations? 5: I think its important to follow the order of operations when simplifying expressions and equation because it defines the order. If you dont use it you will get the wrong answer. For example 4+2×3=4+(2×3)=4+6=10 but if you use the wrong order (4+2)x3=6×3=18 you will come out with the wrong answer. I think its just like looking up directions on the gps. You are going to use the direct steps its gives you. You are not going to choose which directions to take out or you may never get there. I dont think I could invent a new notation where the order of operation was made clear. PEMDAS works for me.
