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Download lan protocols - Bca Cauverians, Gonikoppal
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UNIT--11 LAN PROTOCOLS Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com NETWORK A E Switch B D C Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com Network Protocol:~ N/w Protocol is defined as rules or communication formats which have been agreed by communication device This defines Addressing method Data format Reliability Speed of communication Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com TYPE OF LAN PROTOCOL: Lower-layer Protocol ARC net Ethernet Token Ring Fiber Distributed data Interface Middle-layer Protocol TCP/IP IPX/SPX NETBEUI Higher-layer Protocol HTTP FTP SMTP Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com L0wer Layer Protocol: This operate at the physical and data link layer of OSI reference layer and perform following Functions 1) Transmitting data 2) Ensure data transmission 3) Media Access to the Device Following Protocol are 1) ARC NET 2) Ethernet Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com ARC NET: Attached resource computer network Developed in 1970 by an organization called data point Speed at starting was 156 kbps to 2.5 Mbps. And now it gives 10Mbps This uses Token ring Scheme This consist of an frame format which has three Parts 1) Header 2) Data 3) Trailer SOH SID Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com DID COUNT DATA CRC Main Feature of ARC net: ARC net Support Co-Axial and Twisted pair cables Support star bus and ring topologies This uses token passing system which prevent collusion Limitation of ARC net: Maximum frame size is 508 bytes ACK is required for every frame Maximum number of node in single ARC net is 255 Maximum speed is 10Mbps Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com Ethernet: Most Popular LAN Protocol developed in 1972 in Xerox Palo Alto research Center (PARC) This uses a technique called CSMA/CD which is even known as 802.3 Carrier is a signal containing some specific data Device needs data then it check cable for any signal If multiple device access the signal simultaneously through medium Device near to the point detect and inform all device about collusion Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com Representation of CSMA/CD A B Check for signal C D Step 1 D Step 2 Check for signal A B Start Data Transfer A B C Start Data Transfer C D Step 3 Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com Collision Ethernet Communication:A E Hub B D C Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com BroadCasting Department of BCA ,Cauvery College,Gonikoppal http://www.bcacauverians.com
