CISCO:
CISCO IS A VENDOR COMPANY WHICH MAKES NETWORK DEVICES(hubs,switches,routers etc.)
CISCO DEVICES HAVE THERE OWN OPERATING SYSTEMS WHICH ARE CALLED AS "IOS".
IOS (INTERNETWORK OPERATING SYSTEM)
FEATURES OF IOS:
1.NEVER CORRUPT
2.NO VIRUS
* IOS CAN BE INSTALLED ONLY IN CISCO DEVICES.
CISCO MAKES:
1.HUBS
2.SWITCHES
3.BRIDGE
4.ROUTER
5.WIRELESS AP
CISCO IS THE BEST COMPANY WHICH MAKES DURABLE AND LONG LIFE NETWORK DEVICES BUT THEY ARE VERY COSTLY.