LINUX:In 1969 AT&T made a decision to withdraw Multics and go with GECOS (General Electric Comprehensive Operating Supervisor / System), with AT & T in Bells Lab when Multics was withdrawn some of the programmers named Ken Thompson and Dennis Ritchie decided to rewrite operating system in order to support low cost computer..To Know More



    MICROSOFT:Microsoft was established to develop and sell BASIC interpreters for the Altair 8800. It rose to dominate the home computer operating system market with MS-DOS in the mid-1980s,followed by the Microsoft Windows line of operating systems. To Know More



    CISCO:During the early 1980s, there was a married couple namely Len and Sandy Bosack who used to work in two different departments of computer located in Stanford University. This couple was facing problem in making their computers communicate with each other To Know More





Three types of Cable

1.      Coaxial  ----- Specially using for T.V Connection

1.      Fiber Optic

1.      Twisted Pair
There are two types of Twisted Pair
(STP)                                                                                         (UTP)
Shielded twisted pair cable                                          Unshielded twisted pair cable   

Straight Through Used:--

1.      Switch to Router

2.      Switch to PC or Server

3.      Hub to PC or Server

Crossover Used:

1.      Switch to Switch

2.      Switch to Hub

3.      PC to PC
1.      Hub to Hub
2.      Router to Router
3.      Router to Ethernet
Simple E.g.:
Crossover Use: PC to PC
Straight Through Use:  PC to Switch
Category of UTP
CAT 1.Use for telephone communication and suitable for transmitting data.
CAT 2.  Capable of transmitting data at speed of upto 4Mbps
CAT3.  Use in 10Base –T Network
CAT4. Use in token ring network and can transmit data at speed upto 16 Mbps
CAT 5. Capable of Transmitting data speed upto 100 Mbps
CAT 5e.Use in Network running at speed upto 1000 Mbps
CAT 6.Consist of 4 pairs of 24 gauge copper wire, which can transmit data speed upto 1000 Mbps
The History of Network Cable
1.      1973:  Xerox invents Ethernet. (3MBPS)
2.      1982: Ethernet Standardized between Vendors(10 MBPS)
3.      1995: Fast Ethernet EMERGES (100 MBPS)
4.      2000: Gigabytes Ethernet Images (1000 MBPS)
5.      2002: 10 Gigabytes Ethernet emerges (10000 MBPS)
6.      2007: 100 Gigabytes Ethernet emerges ( 100000 MBPS)



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