500-205 · Question #39
Which type of redundancy configuration can fabric cards be configured in on the NCS 4016 and 4009 platforms?
The correct answer is B. 3+1. On the NCS 4016 and NCS 4009, fabric cards operate in a 3+1 redundancy model - three fabric cards carry active traffic while a fourth stands by as a hot spare, ensuring the system remains fully operational if any single fabric card fails. Option A (2+2) describes an equal…
Question
Which type of redundancy configuration can fabric cards be configured in on the NCS 4016 and 4009 platforms?
Options
- A2+2
- B3+1
- Cno redundancy
- Dmultichassis
How the community answered
(31 responses)- A3% (1)
- B87% (27)
- C3% (1)
- D6% (2)
Explanation
On the NCS 4016 and NCS 4009, fabric cards operate in a 3+1 redundancy model - three fabric cards carry active traffic while a fourth stands by as a hot spare, ensuring the system remains fully operational if any single fabric card fails. Option A (2+2) describes an equal active-to-standby split not used for fabric cards on these platforms. Option C (no redundancy) is wrong because Cisco designed these carrier-grade platforms specifically for high availability, and fabric redundancy is a core feature. Option D (multichassis) is a different concept entirely - it refers to linking multiple physical chassis for redundancy at the system level, not the per-chassis fabric card configuration.
Memory tip: Think "3+1 = N+1" - these Cisco NCS platforms follow a classic N+1 high-availability pattern where N=3 active cards, so you only need to remember one spare protects three actives.
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