Layer 1 Leased Lines
Leased lines have been around a long time, roughly 20 years longer than LANs. However, they still exist today as a WAN service.
As a result of their long history in the market, the networking world has used a large number of different terms. First, the term leased line refers to the fact that the company using the leased line does not own the line, but instead pays a monthly lease fee to use it. Often, you lease the service from a telephone company, or telco. However, many people today use the generic term service provider to refer to a company that provides any form of WAN connectivity, including Internet services. Table 12-2 lists some of those names so that you can understand the different terms you will encounter in a ...
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