What does IOS stand for in Cisco terminology?

• A. Internetwork Operating System
• B. Internet Operating System
• C. Integrated Operating Software
• D. Interface Oriented System

Answer: (A)

In Cisco terminology, IOS stands for Internetwork Operating System. The word “internetwork” highlights the system’s role in enabling communication between multiple networks—routers and switches use this OS to run routing and switching functions that connect different networks together. It’s the software that provides the command-line interface, handles protocols, and manages device configuration.

The other options don’t fit Cisco’s naming conventions: “Internet Operating System” would imply the global Internet itself, which isn’t how the product is described; “Integrated Operating Software” and “Interface Oriented System” aren’t terms Cisco uses for its operating system.