I'd start an article with a question: why do we need a simple Frame Relay, for example, let's suppose that you're working in a large company, and your company has only two points of expansion. The main site that connects the two branch offices branch name branch 1 and 2, and your boss wants the two branches can communicate with the parent site. How to solve the problem, the easiest is to connect them directly (also known as leased line) shown below.
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