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As with a computer, a router or switch cannot function without an
operating system. Cisco calls its operating system the Cisco
Internetwork Operating System or Cisco IOS. It is the embedded
software architecture in all of the Cisco routers and is also the
operating system of the Catalyst switches. Without an operating system, the hardware does not have
any capabilities. The Cisco IOS provides the following network
services:
- Basic routing and switching functions
- Reliable and secure access to networked resources
- Network scalability
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