In Pictures: Critical milestones in Cisco history

Cisco: From its Catalyst 6500 Ethernet switch rollout to 2011's 'transformation,' the networking giant has a rich history

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2004

In 2004, Cisco introduces the Integrated Services Router -- better known as ISR -- for branch offices. ISR goes to become one of Cisco's most successful products, selling more than 7.5 million units in five years. Cisco follows up the first-generation ISR with the ISR G2 (pictured) in 2009.

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In Pictures: Critical milestones in Cisco history

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