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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Dial Access with Modems and ISDN

ImageLesson 6: ISDN

The next two Internet access technologies require us to think back to the early days of the Internet for some perspective. The Internet had many booming growth periods over time, but one such period took off in the very early 1990s, when commercial traffic was beginning to drive huge growth in the Internet.

Back in those early days of the Internet, for consumers, most people accessed the Internet using dial-up. That is, they used their analog phone line and an analog modem and basically placed a phone call to an ISP.

As a brief bit of background, when using a home telephone line, a phone call creates ...

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