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      "body": "<html>\n<p><strong>&nbsp;1. Introduction&nbsp;</strong></p>\n<p>&nbsp;&nbsp;&nbsp;-A network can be defined as a group of computers and other devices connected in some ways so as to be able to exchange data. -Each of the devices on the network can be thought of as a node; each node has a unique address. -Addresses are numeric quantities that are easy for computers to work with, but not for humans to remember. Example: 204.160.241.98 -Some networks also provide names that humans can more easily remember than numbers. Example: www.javasoft.com, corresponding to the above numeric address.&nbsp;</p>\n<p><strong>&nbsp;Addressing&nbsp;</strong></p>\n<p><strong>Internet address&nbsp;</strong></p>\n<p>&nbsp;Consists of 4 bytes separated by periods&nbsp;</p>\n<p>Example: 136.102.233.49&nbsp;</p>\n<p>&nbsp;-The R first bytes (R= 1,2,3) correspond to the network address;</p>\n<p>&nbsp;-The remaining H bytes (H = 3,2,1) are used for the host machine.&nbsp;</p>\n<p><strong>&nbsp;-InterNIC Register</strong>: organization in charge of the allocation of the address ranges corresponding to networks.&nbsp;</p>\n<p>&nbsp;-Criteria considered:</p>\n<p>&nbsp;→ Geographical area (country)</p>\n<p>&nbsp;→ Organization, enterprise&nbsp;</p>\n<p>→ Department</p>\n<p>&nbsp;→ Host&nbsp;</p>\n<p><strong>&nbsp;Domain Name System (DNS)&nbsp;</strong></p>\n<p>&nbsp;-Mnemonic textual addresses are provided to facilitate the manipulation of internet addresses.&nbsp;</p>\n<p>-<strong>DNS</strong> servers are responsible for translating mnemonic textual Internet addresses into hard numeric Internet addresses.&nbsp;</p>\n<p>&nbsp;<strong>Ports</strong> -An IP address identifies a host machine on the Internet.</p>\n<p>&nbsp;-An IP port will identify a specific application running on an Internet host machine. &nbsp;</p>\n<p>&nbsp;Ports</p>\n<p>&nbsp;-An IP address identifies a host machine on the Internet.&nbsp;</p>\n<p>-An IP port will identify a specific application running on an Internet host machine. &nbsp;</p>\n<p><strong>&nbsp;Data Transmission&nbsp;</strong></p>\n<p>&nbsp;-In modern networks, data are transferred using packet switching.&nbsp;</p>\n<p>-Messages are broken into units called packets, and sent from one computer to the other.&nbsp;</p>\n<p>-At the destination, data are extracted from one or more packets and used to reconstruct the original message&nbsp;</p>\n<p>&nbsp;-Each packet has a maximum size, and consists of a header and a data area.&nbsp;</p>\n<p>-The header contains the addresses of the source and destination computers and sequencing information necessary to reassemble the message at the destination.&nbsp;</p>\n<p><strong>&nbsp;Types of Networks&nbsp;</strong></p>\n<p>&nbsp;There are two principle kinds of networks:</p>\n<p>&nbsp;Wide Area Networks (WANs) and Local Area Networks (LANs)&nbsp;</p>\n<p><strong>&nbsp;WANs</strong></p>\n<p>&nbsp;-Cover cities, countries, and continents.&nbsp;</p>\n<p>-Based on packet switching technology&nbsp;</p>\n<p>&nbsp;-Examples of WAN technology: Asynchronous Transfer Mode (ATM), Integrated Services Digital Network (ISDN)&nbsp;</p>\n<p><strong>&nbsp;LANs&nbsp;</strong></p>\n<p>-Cover buildings or a set of closely related buildings. &nbsp;</p>\n<p>&nbsp;-Examples of LAN technology: Ethernet, Token Ring, and Fibber Distributed Data Interconnect (FDDI). &nbsp;</p>\n<p>&nbsp;Ethernet LANs: based on a bus topology and broadcast communication&nbsp;</p>\n<p>&nbsp;Token ring LANs: based on ring topology&nbsp;</p>\n<p>&nbsp;FDDI LANs: use optical fibbers and an improved token ring mechanism based on two rings flowing in opposite directions.&nbsp;</p>\n<p><em><strong>&nbsp;Interconnection&nbsp;</strong></em></p>\n<p>&nbsp;-Networks of low capacity may be connected together via a backbone network which is a network of high capacity such as a FDDI network, a WAN network etc.</p>\n<p>&nbsp;-LANs and WANs can be interconnected via T1 or T3 digital leased lines</p>\n<p>&nbsp;-According to the protocols involved, networks interconnection is achieved using one or several of the following devices:&nbsp;</p>\n<p>&nbsp;→Bridge: a computer or device that links two similar LANs based on the same protocol.</p>\n<p>&nbsp;→ Router: a communication computer that connects different types of networks using different protocols.</p>\n<p>&nbsp;→ B-router or Bridge/Router: a single device that combines both the functions of bridge and router.</p>\n<p>&nbsp;→ Gateway: a network device that connects two different systems, using direct and systematic translation between protocols.&nbsp;</p>\n<p><br></p>\n</html>",
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