Resource Reservation: Guaranteeing Minimum CPU and Memory for Critical VMs
A company runs a critical database application on a virtual machine (VM) hosted on a Type 1 hypervisor. During peak hours, other VMs on the same host consume large amounts of CPU and memory, causing the database VM to experience performance degradation. The administrator wants to guarantee that the database VM always receives at least 4 GB of RAM and 2 vCPUs of processing power, regardless of demand from other VMs. Which virtualization feature should the administrator configure?
Quick Answer
The answer is resource reservation, the correct virtualization feature to guarantee minimum CPU and memory for a critical VM. This setting locks a specified amount of resources—like 4 GB of RAM and 2 vCPUs—exclusively for the database VM, ensuring it never dips below that threshold even when other VMs on the same Type 1 hypervisor compete heavily for resources. On the CompTIA A+ Core 1 220-1101 exam, this concept tests your understanding of how hypervisors allocate physical hardware; a common trap is confusing resource reservation with resource limits or shares, which cap or prioritize usage but do not guarantee a floor. Remember that reservation is like a VIP seat that stays reserved no matter how crowded the bus gets, while limits are the maximum speed a car can drive. For a quick memory tip, think “Reservation = Reserve the minimum, no matter the competition.”
⚠ Common exam trap
A common mix-up: candidates confuse resource reservation with resource pooling or elasticity, mistakenly thinking that dynamic allocation or shared pools can provide guaranteed minimums, when in fact only a reservation enforces a hard floor on resource availability.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Resource reservation
Resource reservation guarantees a minimum amount of CPU and memory resources to a specific VM, ensuring that the database VM always has at least 4 GB of RAM and 2 vCPUs available even when other VMs on the same Type 1 hypervisor are under heavy load. This feature prevents performance degradation by locking those resources for the reserved VM, regardless of demand from other guests.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Resource pooling
Why it's wrong here
Resource pooling aggregates host CPU, memory and storage for shared use, but it does not guarantee a specific VM a minimum 4 GB RAM and 2 vCPUs. Resource pooling would be correct when describing how a hypervisor abstracts and shares physical capacity among VMs.
- ✓
Resource reservation
Why this is correct
Resource reservation guarantees a specified minimum share of CPU and memory to a VM, so the database VM always receives its 4 GB RAM and 2 vCPUs even when other VMs on the Type 1 hypervisor demand resources.
- ✗
Elasticity
Why it's wrong here
Elasticity scales resources up or down automatically in response to demand, but it does not reserve a floor of 4 GB RAM and 2 vCPUs against competing VMs. Elasticity would be correct where workloads need dynamic capacity growth, not guaranteed minimum allocations.
- ✗
Thin provisioning
Why it's wrong here
Thin provisioning allocates storage on demand rather than reserving it upfront, so it addresses disk capacity, not CPU or memory guarantees. Thin provisioning would be correct when aiming to avoid pre-allocating unused storage across many VMs.
Go deeper
Related to this question
Learn chapter
RAM Types and Memory Slots
Key term
RAM
RAM (Random-Access Memory) is volatile computer memory that temporarily stores data for quick access by the CPU.
Key term
Dual In-line Memory Module
A Dual In-line Memory Module (DIMM) is a small circuit board that holds memory chips and plugs into a computer's motherboard to provide Random Access Memory (RAM).
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Same concept, more angles
1 more way this is tested on 220-1101
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company runs a critical database application on a virtual machine (VM) hosted on a Type 1 hypervisor. During peak business hours, other VMs on the same host consume large amounts of CPU and memory, causing the database VM to experience performance degradation. The administrator wants to ensure the database VM always receives at least 4 GB of RAM and 2 vCPUs of processing power, even when other VMs are competing for resources. Which virtualization feature should the administrator configure?
hard- ✓ A.Resource reservation
- B.Resource pooling
- C.High availability
- D.Elasticity
Why A: Resource reservation guarantees that a specific VM always receives a minimum amount of CPU and memory resources, even when other VMs on the same host compete for those resources. In this scenario, setting a reservation of 4 GB RAM and 2 vCPUs ensures the database VM never falls below that threshold, preventing performance degradation during peak usage.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.