Friday, January 23, 2015


Lan Intoduction : History of Ethernet

LAN Introduction: History of Ethernet
Ø  1973 : Xerox invents Ethernet (3 Mbps)
Ø  1982: Ethernet Standards b/w vendors (10Mbps)
Ø  1995: Fast Ethernet emerges (100 Mbps)
Ø  2000: Gigabit Ethernet emerges (1000 Mbps)
Ø  2002: 10 Gigabit Ethernet emerges (10000 Mbps)

Ø  2005: 100 Gigabit Ethernet emerges (100000 Mbps)
Ethernet Distance and Speed: -

CSMA/CD is a set of rules governing how you talk on an Ethernet network
Ø  Carrier: - The Network Signal
Ø  Sense: - The ability to detect.              (Somebody send/receive the data)
Ø  Multiple Access: - All device has equal access
Ø  Collision: - What happens if two devices send at once.
Ø  Detection: - How the computer handle collision when they happen.

 Methods: -
Ø  Unicast: - one to one
Ø  Broadcast: - One to All
Ø  Multicast :- One to many (But not to all)
(One msg. to a group. If they are members of those group)

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