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Because of the popularity of PPP and the Internet, a more secure dial-in solution was needed PPTP grants you the capability to have a user log in to a remote, private, corporate network via any ISP and maintain a secure, encrypted connection This concept is being implemented by more and more companies every year; its popularity has exploded since its rst draft was proposed in 1996

7:

The OSI Model separates the methods and protocols needed for a network connection into seven different layers Each higher layer relies on services provided by a lower-level layer As an illustration, if you were to think about a desktop computer in this way, its hardware would be the lowest layer, and the operating system drivers the next higher layer would rely on the lowest layer to do their job The operating system itself, the next higher layer, would rely on both of the lower layers working properly This continues all the way up to the point at which an application presents data to you on the computer screen This illustration is just to make a point: The real OSI Model contemplates only the network connection itself, and not what, for instance, computer applications do Figure 3-3 shows the seven layers of the OSI Model

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What people think: The Internet is the Web/email/AOL What we think: The Net is much more than meets the eye

Most larger companies now have employees traveling for training, seminars, and conventions Companies require a means for these traveling employees to be able to access the company network securely Remote access is becoming widely used, whether via direct connections with modems or a VPN connection through the Internet

NOTE: The OSI Model is sometimes called the seven-layer model It was developed by the International Standards Organization (ISO) in 1983 and is documented as standard 7498

Integrated Services Digital Network (ISDN)

Ah, the Web We wouldn t have much of a book to write if the Web hadn t come along and brought networked computing to the forefront of public consciousness But

In the past, the phone network consisted of an interconnection of wires that directly connected telephone users via an analog-based system This system was very inef cient because it did not work well for long-distance connections and was very prone to noise In the 1960s, the telephone company began converting this system to a packet-based, digital switching network Today, nearly all voice switching in the United States is digital; however, the customer connection to the switching of ce is primarily still analog

For a complete network connection, data flows from the top layer on one computer, down through all the lower layers, across the wire, and back up the seven layers on the other computer The following sections discuss each layer in turn, making comparisons to real networking systems as appropriate

Integrated Services Digital Network (ISDN) is a system of digital telephone connections that enables data to be transmitted simultaneously end to end This technology has been available for more than a decade and is designed to enable faster, clearer communications for small of ces and home users It came about as the standard telephone system began its migration from an analog format to digital ISDN is the format portion of the digital telephone system now being used to replace analog systems

Figure 3-3

A History of ISDN The concept of ISDN was introduced in 1972 The concept was based on moving the analog-to-digital conversion equipment onto the customer s premises to enable voice and data services to be sent through a single line Telephone companies also began using a new kind of digital communications link between each central of ce A T1 link could carry twenty-four 64 Kbps voice channels, and it used the same amount of copper wire as only two analog voice calls Throughout the 1970s, the telephone companies continued to upgrade their switching of ces They began rolling out T1 links directly to customers to provide high-speed access The need for an ef cient solution was greater than ever In the early 1990s, an effort was begun to establish a standard implementation for ISDN in the United States The National ISDN 1 (NI-1) standard was de ned

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