Computer Networks

Computer Networks are any means by which computers communicate, or send information to each other. Information is sent either through a wire or wirelessly. The most famous and most commonly used computer network is the internet.

In order to send information from a computer to another computer, we must have an address for both computers, just like the post office box addresses. Thus, all computers connected to a network have an address. For the Internet, these addresses are the IP addresses. Next, we must have a medium for transporting the data from computer to computer. The medium is either wired (using electric cables or fiber optics) or wireless (using radio-waves). I shall focus more on wired networks here, because wireless networks are usually only short-ranged and are not (in my opinion) as interesting :P. Since we want to optimize the sending of information around the network, the shape of the network is of extreme importance to us.

There is a lot to talk about when it comes to networks, and I encourage you (yes you) to check out my classmates’ posts on computer networks in their own websites which can be found here: https://www.qatar.cmu.edu/~kharras/courses/15129/other.html.

I, however, find the shapes of networks most fascinating to talk about.

Usually what we care most about when it comes to the shape of a network is the nodes and their edges. Although the distances matter when we talk about speed, the topology, or unweighted graph of the network is a good classification of networks. Topologies mix some repetitive simple forms: stars, buses, trees, and rings. Rings are useful for they connect various computers to each other with minimal wiring. However, when the number of nodes is big, it is more useful to have a star shaped topology. Here, a central computer is connected to many computers around it in the shape of a star. The center is usually something like your internet service provider. In a bus layout, a central cable is connected to many sub-cables which connect to other nodes.

Links

https://en.wikipedia.org/wiki/Computer_network

Must sign-up to watch full video: http://study.com/academy/lesson/what-is-a-computer-network-types-definition-quiz.html

And as always: https://www.coursera.org/learn/networks-illustrated

Questions:

What facts about the deep web are true and which are false? Are there all these layers you see when you google "layers of the web"? (Except for the obviously fantastical Mariana's web)