Now that you have studied wide-area network
(WAN) technologies, it is important to understand that WAN connections
are controlled by protocols that perform the same basic functions as
Layer 2 LAN protocols, such as Ethernet. In a LAN environment, in
order to move data between any two nodes or routers, a data path must
be established, and flow control procedures must be in place to ensure
delivery of data. This is also true in the WAN environment and is
accomplished by using WAN protocols such as Point-to-Point Protocol.
In this chapter, you will learn about
the basic components, processes, and operations that define
Point-to-Point Protocol (PPP) communication. In addition, this chapter
discusses the use of Link Control Protocol (LCP) and Network Control
Program (NCP) frames in PPP. Finally, you will learn how to configure
and verify the configuration of PPP. Along with PPP authentication,
you will learn to use Password Authentication Protocol (PAP) and
Challenge Handshake Authentication Protocol (CHAP).
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Threaded
Case
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Washington
Project: Applying PPP
You
learned about WAN design and developed the
Washington School District's WAN design to allow
connectivity between all sites in the district.
Without a Layer 2 protocol, the physical WAN links
have no mechanism to transmit data and implement
flow control. In this chapter you will apply PPP
as the data link-layer protocol to be used in the
district WAN implementation.
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