Cisco® CCNA Exam Cram Notes : Cisco Router Architecture

II. Cisco IOS

Cisco IOS (Internetwork Operating System) is a proprietary operating system that runs on most Cisco Systems routers and switches. The core function of Cisco IOS is to enable data communications between network nodes. In addition to routing and switching, Cisco IOS offers dozens of additional services that an administrator can use to improve the performance and security of network traffic

1. Cisco Router Architecture

1.1 Block Diagram

2500 series router architecture






























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CCNA Cram Notes Contents
  • I. Networking Fundamentals
  • II. Cisco IOS
    • 1. Cisco Router Architecture
    • 2. Cisco Router (25xx series) and its interfaces
  • III. Routing Technologies
  • IV. LAN Switching Technologies
  • V. WAN Technologies
  • VI. Network Access
  • VII. IP connectivity and Services
  • VIII. Security Fundamentals
  • IX. Automation and Programmability
  • X. Appendix
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