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For more notes and topics visit: eITnotes

Introduction to LAN,MAN and WAN. For more notes and topics visit: www.eITnotes.com. Network classification by size or scale. LAN(Local Area Network) MAN(Metropolitan Area Network) WAN(Wide Area Network). Local Area Networks (LANs): .

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  1. Introduction to LAN,MAN and WAN For more notes and topics visit: www.eITnotes.com eITnotes.com

  2. Network classification by size or scale LAN(Local Area Network) MAN(Metropolitan Area Network) WAN(Wide Area Network) eITnotes.com

  3. Local Area Networks (LANs): A local area network (LAN) is privately owned network that operates in a very small geographical area upto few kilometers. It is used to link devices in a single office, building or a campus. The resources to be shared can be a hardware device like printer, software like an application program or data. The various devices in LAN are connected to central devices called hub or switch using a cable. eITnotes.com

  4. LAN offers high speed communication of data. LAN is easy to and maintain. The communication medium used in LAN is co-axial cable, unshielded twisted pair. LAN operates on principle of the broadcasting. eITnotes.com

  5. The Local Network (LAN) Client Client Client Client Client Client eITnotes.com

  6. Wireless LAN -Most LANs use fixed wiring although increasingly Wireless connectivity (a WLAN) is becoming common.-The major advantage of a WLAN is that there does not need to be a ‘hard-wired’ connection between the computers. This allows users’ computers to easily join and leave the network, and move around. Normally the computers communicate via an access point’ that is permanently connected to a standard fixed network. eITnotes.com

  7. A Typical WLAN eITnotes.com

  8. ETHERNET developed by Xerox in 1973–1975 standardized as IEEE 802.3 has replaced token ring, FDDI and ARCNET usually uses twisted pair cable ( RJ-45) eITnotes.com

  9. Ethernet Standard 10BaseT 10Mbps (Mega bits per second) 100BaseT 100Mbps 1000BaseT 1000Mbps or 1Gbps eITnotes.com

  10. Metropolitan Area Network (MAN) A MAN normally consists of a group of LANs, which may be spread across an area the size of a city. It would normally consist of a number of buildings each with a central hub that connects to the MAN network. Older MANs use broadcast technologies but as switching has become more efficient point to point relay is now more typical and the boundary between MAN and WAN is now becoming unclear. eITnotes.com

  11. MANs are increasingly using the same access technology as LANs. The links are typically made using microwave, radio, infra-red free-space or optical-fiber links. eITnotes.com

  12. Wide Area Network(WAN) WAN covers a large geographic area such as country, continent or even whole of the world. WAN interconnects two or more LANs(or WANs) and provide long distance transmission of data, images, audio and video information. may be public, leased or private Also called “enterprise networks” if they are privately owned by a large company. eITnotes.com

  13. Transmission media include microwave, fibre-optic, telephone lines & satellite. Is typically slower and less reliable than a LAN. Services include internet ,frame relay and ATM(Asynchronous Transfer Mode). The largest and most well-known example of a WAN is the Internet eITnotes.com

  14. DIFFERENCE BETWEEN LAN,MAN,WAN eITnotes.com

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  17. HTTP: THE HYPERTEXT TRANSFER PROTOCOL It is a set of rules or protocol that governs the transfer of hypertext between two or more computers. The hypertext transfer protocol (http) is a protocol used mainly to access data on the World Wide Web. HTTP functions as a combination of FTP and SMTP. eITnotes.com

  18. HTTP uses the services of TCP on port 80. The basic operation consists of three steps: the client opens a TCP connection and sends request for a document. The server respond with the document. The server closes the connection. HTTP transaction between the client and server consists of request and response. HTTP messages from the client to server are called HTTP request. HTTP messages from the server to client HTTP response. eITnotes.com

  19. HTTP transaction eITnotes.com

  20. HTTP request and response messages eITnotes.com

  21. HTTP request message The request line Header Body Status line Header Body HTTP response message eITnotes.com

  22. The request line:- it is consists of three elements: methods or request type, URL, HTTP version. Status line:-it is also consists of three elements: HTTP version, status code, status phrase. eITnotes.com

  23. HTTP request message:-The request type portion of request line in HTTP request message specifies the various methods. eITnotes.com

  24. HTTP response message:-These are status codes of status line in response message eITnotes.com

  25. Status codes (continued) eITnotes.com

  26. Request header:- The header present in HTTP request message is called request header. Each header has a header name, a colon, a space and a header value. eITnotes.com

  27. Various request headers eITnotes.com

  28. Various Response headers eITnotes.com

  29. THANKYOU eITnotes.com

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