350-501 Question #577: Real Exam Question with Answer & Explanation

Question

Which Cisco Software OS uses microkernel architecture?

Options

• AIOS 12.3
• BIOS 15.1
• CIOS
• DIOS XR

Explanation

Cisco IOS XR is the Cisco operating system that employs a microkernel architecture, which provides significant advantages in terms of modularity, fault isolation, and high availability. This contrasts with traditional Cisco IOS, which uses a monolithic kernel.

Approach. Cisco IOS XR (Internetwork Operating System eXtensible Routing) is built on a modular microkernel architecture, distinguishing it from the monolithic kernel of traditional Cisco IOS. This microkernel design isolates processes, allowing for greater stability, fault tolerance, and features like in-service software upgrades (ISSU) as failures in one process do not crash the entire system.

Common mistakes.

• A. IOS 12.3 is a version of Cisco IOS, which is based on a monolithic kernel architecture, not a microkernel.
• B. IOS 15.1 is a version of Cisco IOS, which is based on a monolithic kernel architecture, not a microkernel.
• C. Cisco IOS, in general, refers to the traditional monolithic operating system used on many Cisco routing and switching platforms, which does not employ a microkernel architecture.

Concept tested. Cisco OS architecture (Microkernel)

Reference. https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xr-software/white_paper_c11-736021.html

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