tailieunhanh - Accessing the WAN – Chapter 2

Point-to-Point Protocol. Objectives: In this chapter, you will learn to: Describe the fundamental concepts of point-to-point serial communication. Describe key PPP concepts. Configure PPP encapsulation. Explain and configure PAP and CHAP authentication. | 11 I a 111 CISCO Point-to-Point Protocol Accessing the WAN - Chapter 2 ITE I Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public 1 Cisco Thai Nguyen Networking Academy Objectives In this chapter you will learn to - Describe the fundamental concepts of point-to-point serial communication. - Describe key PPP concepts. - Configure PPP encapsulation. - Explain and configure PAP and CHAP authentication. ITE 1 Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public 2 Cisco Thai Nguyen Networking Academy How Does Serial Communication Work Most PCs have both serial and parallel ports. Computers use of relatively short parallel connections between interior components but use a serial bus to convert signals for most external communications. -With a serial connection information is sent across one wire one data bit at a time. The 9-pin serial connector on most PCs uses two loops of wire one in each direction for data communication plus additional wires to control the flow of information. -A parallel connection sends the bits over more wires simultaneously. In the 25-pin parallel port on your PC there are 8 data wires to carry 8 bits simultaneously. The parallel link theoretically transfers data eight times faster than a serial connection. In reality it is often the case that serial links can be clocked considerably faster than parallel links and they achieve a higher data rate Serial and Parallel Communication Stria CcwiHHntoiflon 00 G 00 ------ --------- gố 1 dry - -Two factors that affect parallel communications clock skew and crosstalk interference. ITE 1 Chapter 6 2006 Cisco Systems Inc. All rights reserved. Cisco Public