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CCNA Quick Reference Sheets (CCNA Exam 640-802) by Jim Doherty, Eric Rivard

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Chapter 9. Establishing Serial Point-to-Point Connections

WANs connect networks, users, and services across a broad geographic area. Companies use the WAN to connect company sites for information exchange (see Figure 9-1).

WAN Connections

Figure 9-1. WAN Connections

Understanding Serial WAN Interfaces

WAN serial interfaces, defined as follows, are either synchronous or asynchronous:

  • Synchronous links have identical frequencies and contain individual characters encapsulated in control bits, called start/stop bits, which designate the beginning and end of each character. Synchronous links try to use the same speed as the other end of a serial link. Synchronous transmission ...

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