350-501 · Question #617
Which Cisco Software OS uses microkernel architecture?
The correct answer is B. IOS XR. Among Cisco's network operating systems, IOS XR is distinct for its use of a microkernel architecture, which provides enhanced modularity and fault isolation.
Question
Which Cisco Software OS uses microkernel architecture?
Options
- AIOS 12.2
- BIOS XR
- CIOS
- DIOS 15.1
How the community answered
(41 responses)- A2% (1)
- B90% (37)
- C5% (2)
- D2% (1)
Why each option
Among Cisco's network operating systems, IOS XR is distinct for its use of a microkernel architecture, which provides enhanced modularity and fault isolation.
Cisco IOS 12.2 is a version of the traditional Cisco IOS, which is based on a monolithic kernel architecture where all system services run in the same kernel space.
Cisco IOS XR is built upon a microkernel architecture, distinguishing it from traditional Cisco IOS versions. This design choice provides significant advantages such as process isolation, allowing individual processes to fail without affecting the entire system, and enabling features like in-service software upgrades (ISSU) for higher availability and modularity.
Cisco IOS (Internetwork Operating System) refers to the classic operating system for Cisco routers and switches, which fundamentally uses a monolithic kernel architecture.
Cisco IOS 15.1 is a more recent version of the traditional Cisco IOS, and it continues to employ a monolithic kernel architecture, unlike IOS XR.
Concept tested: Cisco OS architectures (microkernel)
Source: https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ios-xr-software/white_paper_c11-686940.html
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