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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Cable and DSL

Okay, before I talk about the principal serial encapsulation connections used on Cisco routers (HDLC, PPP, and Frame Relay), I’m going to discuss cable modems and DSL (including ADSL and PPPoE) as solutions for connections to wide area networks because I think it will really help you understand the practical differences between DSL and cable modem networking.

DSL and cable Internet services truly do have a lot in common, but they still have some basic, essential differences that are important for you to understand:

Speed Most would say that cable is faster than DSL Internet, but cable doesn’t always win the race in real-world use.

Security DSL and cable are based on different network security models, and until recently, cable ...

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