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Figure 111 WANs: a switched WAN and a point-to-point WAN
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b Point-to-point WAN
An early example of a switched WAN is X25, a network designed to provide connectivity between end users As we will see in 18, X25 is being gradually replaced by a high-speed, more efficient network called Frame Relay A good example of a switched WAN is the asynchronous transfer mode (ATM) network, which is a network with fixed-size data unit packets called cells We will discuss ATM in 18 Another example ofWANs is the wireless WAN that is becoming more and more popular We discuss wireless WANs and their evolution in 16
Metropolitan Area Networks
A metropolitan area network (MAN) is a network with a size between a LAN and a WAN It normally covers the area inside a town or a city It is designed for customers who need a high-speed connectivity, normally to the Internet, and have endpoints spread over a city or part of city A good example of a MAN is the part of the telephone company network that can provide a high-speed DSL line to the customer Another example is the cable TV network that originally was designed for cable TV, but today can also be used for high-speed data connection to the Internet We discuss DSL lines and cable TV networks in 9
Interconnection of Networks: Internetwork
Today, it is very rare to see a LAN, a MAN, or a LAN in isolation; they are connected to one another When two or more networks are connected, they become an internetwork, or internet As an example, assume that an organization has two offices, one on the east coast and the other on the west coast The established office on the west coast has a bus topology LAN; the newly opened office on the east coast has a star topology LAN The president of the company lives somewhere in the middle and needs to have control over the company
INTRODUCTION
from her horne To create a backbone WAN for connecting these three entities (two LANs and the president's computer), a switched WAN (operated by a service provider such as a telecom company) has been leased To connect the LANs to this switched WAN, however, three point-to-point WANs are required These point-to-point WANs can be a high-speed DSL line offered by a telephone company or a cable modern line offered by a cable TV provider as shown in Figure 112
Figure 112 A heterogeneous network made offour WANs and two LANs
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THE INTERNET
The Internet has revolutionized many aspects of our daily lives It has affected the way we do business as well as the way we spend our leisure time Count the ways you've used the Internet recently Perhaps you've sent electronic mail (e-mail) to a business associate, paid a utility bill, read a newspaper from a distant city, or looked up a local movie schedule-all by using the Internet Or maybe you researched a medical topic, booked a hotel reservation, chatted with a fellow Trekkie, or comparison-shopped for a car The Internet is a communication system that has brought a wealth of information to our fingertips and organized it for our use The Internet is a structured, organized system We begin with a brief history of the Internet We follow with a description of the Internet today
SECTION 13
THE INTERNET
A Brief History
A network is a group of connected communicating devices such as computers and printers An internet (note the lowercase letter i) is two or more networks that can communicate with each other The most notable internet is called the Internet (uppercase letter I), a collaboration of more than hundreds of thousands of interconnected networks Private individuals as well as various organizations such as government agencies, schools, research facilities, corporations, and libraries in more than 100 countries use the Internet Millions of people are users Yet this extraordinary communication system only came into being in 1969 In the mid-1960s, mainframe computers in research organizations were standalone devices Computers from different manufacturers were unable to communicate with one another The Advanced Research Projects Agency (ARPA) in the Department of Defense (DoD) was interested in finding a way to connect computers so that the researchers they funded could share their findings, thereby reducing costs and eliminating duplication of effort In 1967, at an Association for Computing Machinery (ACM) meeting, ARPA presented its ideas for ARPANET, a small network of connected computers The idea was that each host computer (not necessarily from the same manufacturer) would be attached to a specialized computer, called an inteiface message processor (IMP) The IMPs, in tum, would be connected to one another Each IMP had to be able to communicate with other IMPs as well as with its own attached host By 1969, ARPANET was a reality Four nodes, at the University of California at Los Angeles (UCLA), the University of California at Santa Barbara (UCSB), Stanford Research Institute (SRI), and the University of Utah, were connected via the IMPs to form a network Software called the Network Control Protocol (NCP) provided communication between the hosts In 1972, Vint Cerf and Bob Kahn, both of whom were part of the core ARPANET group, collaborated on what they called the Internetting Projec1 Cerf and Kahn's landmark 1973 paper outlined the protocols to achieve end-to-end delivery of packets This paper on Transmission Control Protocol (TCP) included concepts such as encapsulation, the datagram, and the functions of a gateway Shortly thereafter, authorities made a decision to split TCP into two protocols: Transmission Control Protocol (TCP) and Internetworking Protocol (lP) IP would handle datagram routing while TCP would be responsible for higher-level functions such as segmentation, reassembly, and error detection The internetworking protocol became known as TCPIIP
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