Discussion
Suppose that you have a customer who has a central HQ and six branch offices. They anticipate adding six more branches in the near future. They wish to implement a WAN technology that will allow the branches to economically connect to HQ and you have no free ports on the HQ router. Which of the following would you recommend?
Answer: C
Correct answer: Frame Relay
Frame Relay carries many permanent virtual circuits over one physical connection, so twelve branches can be reached through a single serial interface at headquarters using subinterfaces. That directly solves the stated problem of having no free ports, and it costs far less than twelve leased lines. PPP and HDLC are point-to-point and would need a port each, and ISDN is dial-up rather than an always-on branch link.
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