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4. Cisco Systems
Cisco Systems
Fortune 500 rank: 57

The convergence of data, voice and video is spurring companies to upgrade their networks with the Internet router and switch giant's products.

Sales of Cisco's advanced technology products, like its TelePresence video-conferencing system, helped profits rise 9.8% to $8 billion on sales of $39.5 billion.

NEXT: Oracle
Last updated April 29 2009: 1:31 PM ET
2009 Fortune 500
Top 50
Top 50
Exxon Mobil pushes Wal-Mart aside to retake the No. 1 slot this year. Which other companies made the top 50 this year? More
They're hiring!
They're hiring!
As many big companies are announcing mass layoffs, these Fortune 100 employers have at least 150 openings each. More
The biggest losers
The biggest losers
Companies from AIG to United Airlines, from ConocoPhillips to Motorola lost billions of dollars last year. Who lost the most? More
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