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Unformatted text preview: ) (c) 77. (a) (b) (c) (d) (e) (f) (d) (e) (f) Asynchronous and synchronous transmission Write short notes on: LAN versus WAN Communication protocols Ethernet Write short notes on: The OSI model Internetworking tools Distributed computing systems Write short notes on: Fixed versus mobile wireless systems Issues in successful use of wireless computing systems Wireless applications Multihop wireless networks Write short notes on: Analog cellular Digital cellular Mobile radio networks Write short notes on: 2G technology 3G technology Wireless LANs Cellular Digital Packet Data (CDPD) Personal Communications Services (PCS) Local Multipoint Distribution Systems (LMDS) Wireless Local Loops (WLLs) Radio-router technology Wireless Application Protocol (WAP)1 Chapter 18 The Internet DEFINITION (WHAT IT IS?) The Internet is a huge network of computers that links many different types of computers all over the world. It is a network of networks that share a common mechanism for addressing (identifying) computers and a common set of communication protocols for communications between two computers on the network. BRIEF HISTORY The Internet has its root in the ARPANET system of the Advanced Research Project Agency of the U.S. Department of Defense. ARPANET was the first WAN and had only four sites in 1969. The Internet evolved from the basic ideas of ARPANET for interconnecting computers and was initially used by research organizations and universities to share and exchange information. In 1989, the U.S. Government lifted restrictions on the use of the Internet and allowed it to be used for commercial purposes as well. Since then, the Internet has rapidly grown to become the world's largest network. It now interconnects more than 30,000 networks, allowing more than 10 million computers and more than 50 million computer users in more than 150 countries around the world to communicate with each other. The Internet continues to grow at a rapid pace. ITS BASIC SERVICES There are basically four types of services p...
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