# Microsoft
According to the research firm IDC, Microsoft is ranked among the top 15 in the IT security vendors in terms of the revenue. The firm is said to be keen on working with security researchers to work on crime botnets that have seized the operations of the computers worldwide. The company has been in the trusted books of people for providing security and has been admired for its efforts over the years.

 # Cisco
Headquartered in California, Cisco systems are the pioneers in manufacturing, selling and designing the networking equipments. They are one of the top dealers in security products like the firewalls and offers services for small business organizations and corporate markets too. Cisco also offers a lot of other software products like the Cisco security manager, Cisco Works Network management Software and many more.

# Symantac
Symantac is an American company which offers storage, backup and security software with professional services for its support. The company competes with most of the anti-virus software companies and is the top vendor in the worldwide IT product revenues list as per the research conducted by IDC. 

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