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While Cisco Systems' core development areas continue to be in routing and switching, it also provides advanced technologies such as IP communications, application networking services and network security.
Founded in 1979, this storage stalwart has presence in more than 60 countries around the world and employs approximately 38,000 globally.
IBM, whose businesses include software, storage, servers and services, has also ventured into new areas such as environmental, social networking and "cloud computing" technologies.
Best known for its Windows operating system and application software, Microsoft continues to ramp up efforts in the online search business.
Founded in 1968, Tata Consultancy Services is one of the oldest providers of IT and business process outsourcing services in India.
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