Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) — Question 249

Which OS uses a distributed subsystem architecture?

Answer options

• A. IOS XE
• B. IOS
• C. IOS XR
• D. CatOS

Correct answer: C

Explanation

IOS XR is designed with a distributed subsystem architecture, allowing for better scalability and reliability in routing operations. In contrast, IOS and CatOS do not implement this architecture, and IOS XE, while modern, is not classified under the same distributed design as IOS XR.