If a Cisco ARC cluster is fully operational, how many replica copies does each shard have in addition to the leader replica?

Question

Options

• A4
• B3
• C1
• D2

• A
  6% (2)
• B
  91% (29)
• C
  3% (1)

Explanation

In a fully operational Cisco ARC (Automated Redundancy Cluster) cluster, each shard maintains 3 replica copies in addition to the leader replica, resulting in a total replication factor of 4 per shard - this redundancy ensures high availability and fault tolerance across the cluster.

Option A (4) is incorrect because that would mean 5 total copies per shard, which exceeds ARC's design specification and is unnecessarily resource-intensive. Option C (1) is wrong because a single replica offers minimal redundancy and would not meet enterprise-grade resilience requirements. Option D (2) is a common replication count in other systems (like some Kafka setups), making it a tempting distractor, but ARC specifically uses 3 replicas to tolerate multiple simultaneous node failures.

Memory tip: Think of the ARC's replication count as matching the three legs of an arc: 3 replicas support the leader, just as three points define a curve. Alternatively, remember "ARC = 1 leader + 3 followers = 4 total" - if you see "4" as an answer choice, that's the total count, not the additional replica count.

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