The answer is to use a mix of reserved instances for the minimum required capacity and spot instances to handle the daily workload. This approach optimizes cost for batch jobs by leveraging reserved instances for the predictable baseline memory-intensive load, which offers significant discounts over on-demand pricing, while using spot instances to absorb the daily spike in demand at a fraction of the cost. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding of workload profiling and the trade-offs between instance purchasing options—specifically that reserved instances provide stability for steady-state needs, and spot instances are ideal for fault-tolerant, time-flexible batch processing. A common trap is choosing on-demand for simplicity, but that ignores the substantial savings from mixing models. Remember the memory tip: “Reserve the base, spot the race”—lock in your minimum capacity with reserved instances, then let spot instances handle the daily surge.
CV0-004 Operations and Support Practice Question
This CV0-004 practice question tests your understanding of operations and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A cloud administrator is managing a fleet of virtual machines that run a batch processing job. The job is memory-intensive and runs once a day. The administrator wants to optimize cost without affecting performance. Which of the following is the BEST approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a mix of reserved instances for the minimum required capacity and spot instances to handle the daily workload
Option A is correct: using a combination of reserved instances for baseline and spot instances for spikes reduces cost. Option B is wrong: on-demand is most expensive. Option C is wrong: dedicated hosts are costly and unnecessary. Option D is wrong: shutting down manually is inefficient and may miss jobs.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Purchase dedicated hosts to ensure resource isolation
Why it's wrong here
Dedicated hosts are expensive and not needed for batch jobs.
✓
Use a mix of reserved instances for the minimum required capacity and spot instances to handle the daily workload
Why this is correct
Reserved instances provide discount; spot instances offer cheap compute for tolerant jobs.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Manually shut down instances when the job completes
Why it's wrong here
Manual intervention is not scalable and may miss cost savings opportunities.
✗
Use only on-demand instances to avoid commitment
Why it's wrong here
On-demand is most expensive for regular workloads.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CV0-004 NAT questions on configuration and troubleshooting.
Operations and Support — This question tests Operations and Support — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a mix of reserved instances for the minimum required capacity and spot instances to handle the daily workload — Option A is correct: using a combination of reserved instances for baseline and spot instances for spikes reduces cost. Option B is wrong: on-demand is most expensive. Option C is wrong: dedicated hosts are costly and unnecessary. Option D is wrong: shutting down manually is inefficient and may miss jobs.
What should I do if I get this CV0-004 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CV0-004 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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