CV0-003 Question #359: Real Exam Question with Answer & Explanation

The correct answer is D: Adding a host to a cluster. Horizontal scaling means increasing capacity by adding more nodes to a system, while vertical scaling means adding resources to an existing node. Adding a host to a cluster is the textbook definition of horizontal scaling.

Cloud Architecture and Design

Question

Which of the following is an example of horizontal scaling?

Options

AMigrating a VM guest from one host to another in a cluster
BAdding VM guests to a host
CAdding CPU to a host
DAdding a host to a cluster

Explanation

Horizontal scaling means increasing capacity by adding more nodes to a system, while vertical scaling means adding resources to an existing node. Adding a host to a cluster is the textbook definition of horizontal scaling.

Common mistakes.

A. Migrating a VM from one host to another is a live migration or workload balancing operation - it moves existing capacity but does not add new capacity to the environment.
B. Adding VM guests to a host increases utilization of the existing host's resources but does not introduce new capacity into the cluster, so it is not a scaling operation.
C. Adding CPU to a host is vertical scaling (scale-up) because it increases the resource capacity of an existing node rather than adding a new node to the infrastructure.

Concept tested. Horizontal vs vertical scaling in virtualized cluster environments

Reference. https://learn.microsoft.com/en-us/azure/architecture/best-practices/auto-scaling

Topics

#horizontal scaling#scale out#vertical scaling#cluster expansion

Community Discussion

No community discussion yet for this question.

Full CV0-003 Practice