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Exam 300-550 topic 1 question 70 discussion

Actual exam question from Cisco's 300-550
Question #: 70
Topic #: 1
[All 300-550 Questions]

Which statement about sharding in ACI is true?

  • A. Sharding is the technology that is designed to prevent "split-brain" scenarios in ACI.
  • B. Sharding is the service that presents the API on a Cisco APIC.
  • C. Sharding is the mechanism for the distributing the database and configuration changes on a Cisco APIC cluster.
  • D. Sharding is the distributed topology that is used in ACI (also referred to as spine-leaf).
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Suggested Answer: C 🗳️
The Cisco APIC cluster uses a technology from large databases called sharding to distribute data among the nodes of the cluster. Data stored in the APIC is portioned to shards. Each shard has three replicas that are stored in the three controller nodes. For each shard, one controller is elected as leader and the rest are followers.

Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/kb/b_kb-aci-stretched-fabric.html
by maj at Feb. 13, 2019, 3:45 a.m.

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maj
5 years, 10 months ago
Sharding is the technology that is designed to prevent "split-brain" scenarios in ACI. https://qbox.io/blog/split-brain-problem-elasticsearch https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/unified-fabric/white-paper-c11-730021.pdf
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