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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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Introduction to LAN,MAN and WAN For more notes and topics visit: www.eITnotes.com eITnotes.com
Network classification by size or scale LAN(Local Area Network) MAN(Metropolitan Area Network) WAN(Wide Area Network) eITnotes.com
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
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
The Local Network (LAN) Client Client Client Client Client Client eITnotes.com
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
A Typical WLAN eITnotes.com
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
Ethernet Standard 10BaseT 10Mbps (Mega bits per second) 100BaseT 100Mbps 1000BaseT 1000Mbps or 1Gbps eITnotes.com
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
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
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
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
DIFFERENCE BETWEEN LAN,MAN,WAN eITnotes.com
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
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
HTTP transaction eITnotes.com
HTTP request and response messages eITnotes.com
HTTP request message The request line Header Body Status line Header Body HTTP response message eITnotes.com
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
HTTP request message:-The request type portion of request line in HTTP request message specifies the various methods. eITnotes.com
HTTP response message:-These are status codes of status line in response message eITnotes.com
Status codes (continued) eITnotes.com
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
Various request headers eITnotes.com
Various Response headers eITnotes.com
THANKYOU eITnotes.com