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switched-broadband transport, they are expensive, complex, and cumbersome to operate. And given the degree to which IP has taken the lead position in networking discussions today, it makes sense that IP should have its space, particularly given the fact that it is now being deployed in conjunction with Multiprotocol Label Switching (MPLS) as a carriergrade, layer three network infrastructure that offers truly granular QoS. We begin with a discussion of the remarkable protocol suite called TCP/IP and how it works. The Internet as we know it today began as a DoD project designed to interconnect DoD research sites. In December of 1968, the government research agency known as the Advanced Research Projects Agency (ARPA) awarded a contract to Bolt, Beranek, and Newman (BBN) to design and build the packet network that would ultimately become the Internet. It had a proposed transmission speed of 50 Kbps, and in September of 1969 the first node was installed at UCLA. Other nodes were installed on roughly a monthly basis at Stanford Research Institute (SRI), the University of California at Santa Barbara (UCSB), and the University of Utah. The ARPANET spanned the continental United States by 1971 and had connections to research facilities in Europe by 1973. The original protocol selected for the ARPANET was called the Network Control Protocol (NCP). It was designed to handle the emergent requirements of the low-volume architecture of the ARPANET network. As traffic grew, however, it proved to be inadequate to handle the load, and in 1974 a more robust protocol suite was implemented, based on the TCP an ironclad protocol designed for end-to-end network communications control. In 1978, a new design split the responsibilities for end-toend vs. node-to-node transmission between two protocols: the newly crafted IP, designed to route packets from device to device and TCP, designed to offer reliable, end-to-end communications. Since TCP and IP were originally envisioned as a single protocol, they are now known as the TCP/IP protocol suite, a name that also incorporates a collection of protocols and applications that also handle routing, QoS, error control, and other functions. One problem that occurred that the ARPANET planners didn t envision when they sited their nodes at college campuses was visibility. Naturally, they placed the switches in the raised floor facilities of the computer science department, and we know what is also found there: Undergraduus Nerdus, the dreaded computer science (or worse yet, engineering) student. In a matter of weeks the secret was out ARPA s top secret network was top secret no longer. So, in 1983, the ARPANET was
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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split into two networks. One half, still called ARPANET, continued to be used to interconnect research and academic sites; the other, called MILNET, was specifically used to carry military traffic and ultimately became part of the Defense Data Network. That year was also a good year for TCP/IP. It was included as part of the communications kernel for the University of California s UNIX implementation, known as 4.2BSD (Berkeley Software Distribution) UNIX. Extension of the original ARPANET continued. In 1986, the National Science Foundation (NSF) built a backbone network to interconnect four NSF supercomputing centers and the National Center for Atmospheric Research. This network, known as NSFNET, was originally intended to serve as a backbone for other networks, not as a stand-alone interconnection mechanism. Additionally, the NSF s Appropriate Use Policy limited transported traffic to noncommercial traffic only. NSFNET continued to expand, and eventually became what we know today as the Internet. And while the original NSFNET applications were multiprotocol implementations, TCP/IP was used for overall interconnectivity. In 1994, a structure was put in place to reduce the NSF s overall role in the Internet. The new structure consists of three principal components. The first of these was a small number of network access points (NAPs), where ISPs would interconnect to the Internet backbone. The NSF originally funded four NAPs in Chicago (operated by Ameritech, now part of SBC), New York (really Pensauken, NJ, operated by Sprint), San Francisco (operated by Pacific Bell, now part of SBC), and Washington, D.C. (MAE-East, operated by MFS, now a division of MCI). The second component was the very High-Speed Backbone Network Service, a network that interconnected the NAPs and was operated by MCI. It was installed in 1995 and originally operated at OC-3 (155.52 Mbps) but was upgraded to OC-12 (622.08 Mbps) in 1997. The third component was the routing arbiter, designed to ensure that appropriate routing protocols for the Internet were available and properly deployed. ISPs were given 5 years of diminishing funding to become commercially self-sustaining. The funding ended in 1998, and starting at roughly the same time, a significant number of additional NAPs have been launched. As a matter of control and management, three tiers of ISPs have been identified. Tier 1 refers to national ISPs that have a national presence and connect to at least three of the original four NAPs. National ISPs include AT&T, Cable & Wireless, MCI, and Sprint. Tier 2 refers to regional ISPs, which primarily have a regional presence and connect to
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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