15 Replication & HA questions from the Redis bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
B.the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
C.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
D.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
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2. Which term means: "copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync"?
Junior
A.Leader-replica replication
B.Sentinel
C.Automatic failover
D.Quorum
Answer + AI explanation with Pro
3. Which statement is correct?
Junior
A.Leader-replica replication — the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
B.Leader-replica replication — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
C.Leader-replica replication — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
D.Leader-replica replication — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
Answer + AI explanation with Pro
4. What is Sentinel?
Mid
A.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
B.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
C.the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
D.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
Answer + AI explanation with Pro
5. Which term means: "a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically"?
Mid
A.Sentinel
B.Quorum
C.Partial resynchronization
D.Leader-replica replication
Answer + AI explanation with Pro
6. Which statement is correct?
Mid
A.Sentinel — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
B.Sentinel — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
C.Sentinel — resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
D.Sentinel — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
Answer + AI explanation with Pro
7. What is Automatic failover?
Mid
A.the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
B.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
C.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
D.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
Answer + AI explanation with Pro
8. Which term means: "the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability"?
Mid
A.Quorum
B.Partial resynchronization
C.Sentinel
D.Automatic failover
Answer + AI explanation with Pro
9. Which statement is correct?
Mid
A.Automatic failover — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
B.Automatic failover — the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
C.Automatic failover — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
D.Automatic failover — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
Answer + AI explanation with Pro
10. What is Quorum?
Senior
A.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
B.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
C.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
D.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
Answer + AI explanation with Pro
11. Which term means: "the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized"?
Senior
A.Automatic failover
B.Sentinel
C.Partial resynchronization
D.Quorum
Answer + AI explanation with Pro
12. Which statement is correct?
Senior
A.Quorum — resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
B.Quorum — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
C.Quorum — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
D.Quorum — the unattended promotion of a replica to primary when the original primary is judged down, restoring write availability
Answer + AI explanation with Pro
13. What is Partial resynchronization?
Senior
A.resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
B.a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
C.the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
D.copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
Answer + AI explanation with Pro
14. Which term means: "resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy"?
Senior
A.Partial resynchronization
B.Quorum
C.Automatic failover
D.Leader-replica replication
Answer + AI explanation with Pro
15. Which statement is correct?
Senior
A.Partial resynchronization — copying all writes from one primary node to one or more read-only copies that stay asynchronously in sync
B.Partial resynchronization — a monitoring process that watches nodes, detects an unreachable primary, and coordinates promoting a replica automatically
C.Partial resynchronization — the minimum number of monitoring processes that must agree a primary is unreachable before a failover is authorized
D.Partial resynchronization — resuming replication after a brief disconnect by sending only the backlog of missed commands instead of a full dataset copy
Answer + AI explanation with Pro
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