First Lecture DCN386

DCN386 First Lecture

Test on week 6 another test on week 10, a lot of lab marks in the cisco room, configure and take out of a router, data communication is career, mainframe computers start from big to small personal computer, the story of a purchasing through cash register, if you buy something a message is sent to the main computer of the company so it says that you have purchased the item. Banks to mainframe computers to lottery ticket machines all these are examples of DTE DATA TERMINAL EQUIPMENT, Sending data is through the NIC card, another way for this is a MODEM 70% of the world use modems, multiplexors MUX for short, there is a collective term for these devices they are called DCE Data Communication Equipment, these are sepretate devices made by different people, How do they connect together they use Standards, last semester for the cables and wireless we called them the communication medium, an example of this would be copper wire, fiber optics, wireless
Can you send data through a vacuume?

Rules for any DTE to DCE we call the rules interfaces, theirs are hundreds of interfaces and we will only learn a couple, again this is standardized, think in terms of data communication protocols, we are going to learnining detailed understanding of the protocols what they do and how does it work?


What is token ring?

It is a older technology, Developed by IBM first but not only LAN technology, complex hard to install, its obsolete now, Zerox brilliant that invented a ton of stuff like mice, windows, taken by Microsoft and apple, the most important thing they created was an Ethernet Network Interface Card, companies have Ethernet, they couldn’t intercommunicate with each other because u couldn’t intercommunicate until standards took over, the group that standardized Local Area Network identify four standards orgnization and tell me them, the first standard organization is the IEEE, started a project in 1980 the 802 family of standards and have been working for LAN ever since, first thing they did was create a standard protocol 802.2, they modified slightly Ethernet 802.3 and token 802.5, wireless 802.11.

IEEE student member,

Another standard group ITU this is a telecommunications union, get countries network to internet with each other, they have standards for everything, TIA-586A or B created provide contractors with a standard way to build networks, we will be talking about later in this course. IETF never invented a standard but a lot of protocols were made by this ogroup, this job is to listen to comments, you may write memos, HYPER TEXT a way of linking sites, www….changed the world, he set his idea on paper and it was tested by IETF and changed the world. Go to the website and look for the request for comments RFC.