FREE CompTIA Cloud+ High Availability and Recovery Questions and Answers

Question 1

A financial application requires that database transactions are written to both a primary and a secondary database in different availability zones simultaneously. A transaction is only considered complete after it is successfully committed to both locations to ensure zero data loss in case of a failure. Which type of replication does this scenario describe?

Accepted Answer

Synchronous replication

Answer

Synchronous replication writes data to both the primary and secondary storage locations at the same time. The operation is not considered complete until the write is acknowledged by both locations, which guarantees that the data is identical and up-to-date. This method achieves a Recovery Point Objective (RPO) of zero but can introduce latency. [11, 28]

Question 2

In a high-availability cluster configuration, two servers are set up to provide redundancy for a critical application. One server actively handles all requests, while the other remains in standby mode, ready to take over only if the primary server fails. What is this configuration called?

Accepted Answer

Active-passive cluster

Answer

An active-passive cluster involves one node that is operational (active) and one node that is on standby (passive). The passive node only takes over the workload if the active node fails. This is a common configuration for failover and disaster recovery. [1, 4, 16]

Question 3

Which of the following cloud architecture principles is MOST directly aimed at achieving fault tolerance by eliminating single points of failure?

Accepted Answer

Deploying redundant components across multiple availability zones

Answer

Fault tolerance is the ability of a system to continue operating without interruption when one or more components fail. Deploying redundant resources, such as virtual machines or databases, across multiple, physically isolated availability zones ensures that the failure of a single zone does not cause a complete service outage. [5, 12, 19]

Question 4

A cloud administrator is configuring high availability for a web application where users log in and perform a series of actions. The application requires that once a user starts a session, all subsequent requests from that user are sent to the same backend server. Which load balancer configuration must be enabled to meet this requirement?

Accepted Answer

Session persistence

Answer

Session persistence, also known as sticky sessions, is a load balancer feature that directs all requests from a single client to the same backend server for the duration of a session. This is critical for stateful applications that store session-specific data on the server. [2, 29, 31]

Question 5

An organization wants a cost-effective disaster recovery strategy in the cloud. The plan involves continuously replicating data to a secondary region and maintaining a minimal version of the core infrastructure, such as a small database instance and a single web server. In a disaster, this minimal environment will be scaled up to full production capacity to take over the workload. What is this DR strategy called?

Accepted Answer

Pilot Light

Answer

The Pilot Light strategy involves keeping a minimal version of the environment running in the cloud, which contains only the most critical core components. In the event of a disaster, this 'pilot light' can be quickly scaled up to a full production environment. It offers a balance between cost and recovery time, being faster than backup and restore but cheaper than warm standby. [6, 7, 9, 15]

CompTIA Cloud+ Practice Test

CompTIA Cloud+ Practice Test

FREE CompTIA Cloud+ High Availability and Recovery Questions and Answers