Computer Network Unit 1 q what are the topologies in computer n/w ?

Q 6. Explain Ethernet with frame format ?
Ans: Ethernet is the most widely-installed local area network ( LAN) technology. Specified in a standard, IEEE 802.3, Ethernet was originally developed by Xerox from an earlier specification called Alohanet and then developed further by Xerox, DEC, and Intel. An Ethernet LAN typically uses coaxial cable or special grades of twisted pair wires. Ethernet is also used in wireless LANs.


Ethernet was originally developed to run on a long coaxial cable that connected all the computers on the network. This type of network topology is called a bus. When one station transmitted data, all the other stations heard it. Ethernet was designed assuming that all stations would hear these broadcasts to the segment of wire used to connect them. This is where the terms 'wire segment' and 'broadcast domain' come from. A broadcast domain includes all the wire and computers that can hear each other whenever one of the computers is transmitting. A wire segment is the piece of wire used to connect two devices.

IEEE 803.2 / 802.2

7 bytes	1 byte	2 or 6 bytes	2 or 6 bytes	2 bytes	4-1500 bytes				4 bytes