Leased Line WANs with HDLC
Lesson 1: Basic Serial Interface Configuration and Verification
A physical leased line WAN works a lot like in an Ethernet crossover cable connecting two routers, but with no distance limitations. As shown in Figure 12-1, each router can send at any time (full duplex). The speed is also symmetric, meaning that both routers send bits at the same speed.
Figure 12-1 Leased Line: Same Speed, Both Directions, Always On
Although the leased line provides a physical layer bit transmission facility, routers also need to use ...
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