COMPUTER COURSES (DHNE)

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on April 28, 2018

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TOKEN RING

2. Token Ring = Token Ring local area network (LAN) technology is a communications protocol for local area networks. It uses a special three-byte frame called a "token" that travels around a logical "ring" of workstations or servers.

OSI MODEL

OSI (OPEN SYSTEM INTERCONNECTION) -It is a reference model -In actual we use TCP/IP (transimition control protocol / internet protocol) -It consist of 7 layers - It is developed by ISO ( International orginasition for standardisition ) PHYSICAL LAYER :- - Data will be in bits - Bits will be converted into light signals or electric signals - protocol data unit is bits DATA LINK LAYER :- -It adds hedder & trailer -Header & trailer cotains MAC address of source and destination -Header contains destination MAC address -Trailer contains source MAC address -protocol data unit is frame Network layer :- -the routing layer -It provides addressing and routing service - There are 2 addresses in packet one is source address & another is destination address -The primary network protocol on the neternet , IPv4 ,IPv6 logical addressing -It is used to connect multiple network -network layer does not broadcast the data -protoc

LAN

LAN (local area network) :- A local area network (LAN) is a computer network within a small geographical area such as a home, school, computer laboratory, office building or group of buildings. A LAN is composed of inter-connected workstations and personal computers which are each capable of accessing and sharing data and devices * We can connect 1024 switch at a time * The LAN can extend upto 1km * The speed of LAN can varies from 10 Mbps , 100 Mbps , 1000 Mbps & 10,000 Mbps

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