col. The fourth layer (medium), shouting and grabbing from the table rather than politely requesting assistance from another person seated nearby, is unacceptable behavior in most any social situation. By analyzing this interaction in terms of layers you can understand more clearly some of the problems of communication in both humans or computers, and how you might solve them. As you learned in chapter 1, the most basic level of computer information consists of binary digits, or bits (0s and 1s). Computers that send one or two bits of information, however, would not be very useful, so other groupings - bytes, kilobytes, megabytes, and gigabytes - are necessary. In order for computers to send information through a network, all communications on a network originate at a source, then travel to a destination. ...
