Networking is an integral part of the technician’s job. It is difficult to imagine a PC without the ability to connect to a shared printer or drive, let alone the Internet. Networking accounts for 15 percent of both the 220-701 and 220-702 CompTIA A+ Exams.
The seven layer OSI model reduces complexity, ensures interoperability among devices, and simplifies learning. Developed by the International Standards Organization (ISO), it is the global model used to teach and organize the countless networking protocols and devices. Table 4-1 describes the layers of the OSI model.
Table 4-1. OSI Model