POWER UP YOUR SMALL-MEDIUM BUSINESS: A GUIDE TO ENABLING NETWORK TECHNOLOGIES

Chapter 2: What Is a Computer Network?

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Some popular Internet applications and the transport protocols that they

typically use are noted in Table 2-1.

OSI

Open Systems Interconnection (OSI) is another protocol model. It too is

constructed of network protocols that are layered on top of one another. The OSI

reference model was introduced in the 1990s to serve as a standard for data

network design and product interoperability capabilities. It is made up of seven

layers, each of which describes a specific aspect of the communications process.

These layers define how signals and data are carried through networks. For the

most part, the lower layers deal ...