Mixed practice exam 2

Explanation

Answer: C. AWS words this advantage as "trade fixed expense for variable expense." The fixed expense is the up-front purchase of data centers and servers that must be made before demand is known; the variable expense is a charge that accrues only while resources run, and only in proportion to how much is consumed.

• A. Go global in minutes concerns deploying into Regions worldwide to lower latency, which is a reach benefit rather than a spending model.
• B. Increase speed and agility concerns the drop in time to make resources available to developers, from weeks to minutes.
• D. Stop guessing capacity concerns removing the need to forecast infrastructure size in advance. It is closely related but describes provisioning rather than how the expense is incurred.

Explanation

Answer: C. A capital expenditure buys an asset up front, before the benefit is realized, and that asset is then owned and depreciated over its useful life. An operating expenditure is incurred as the service is consumed. Moving to the cloud shifts spending from the first pattern to the second, which is what AWS means by trading fixed expense for variable expense.

• A. The distinction is about ownership and timing relative to use, not about the billing interval. An annually invoiced subscription is still operating expenditure.
• B. Organizations of every size use both. The choice is driven by what is being acquired, not by company size.
• D. Both categories can contain hardware and software. A perpetual software license bought outright is capital spending; a subscription is operating spending.

Explanation

Answer: D. This is AWS's "benefit from massive economies of scale" advantage. Because demand from a very large customer base is pooled, AWS buys, builds, and operates at a scale no single customer can match, and passes the resulting efficiency on as lower pay-as-you-go prices. AWS has reduced prices many times over the life of the platform as a result.

• A. Bring your own license is a licensing arrangement in which the customer applies existing software licenses to cloud resources.
• B. Total cost of ownership is a comparison method that accounts for all direct and indirect costs of an option over time.
• C. Rightsizing is matching the size of a provisioned resource to the workload's actual requirement. It lowers a customer's own bill but does not describe the provider's cost structure.

Explanation

Answer: D. Rightsizing means analyzing actual utilization and then adjusting the resource so that it fits the workload, which usually means downsizing or terminating instances that are consistently underused. It attacks waste directly, because an oversized instance costs the same whether or not the capacity is used.

• A. Choosing the largest instance for headroom is the opposite of rightsizing and is a common source of overspending.
• B. A multi-year commitment is a purchasing discount. It lowers the rate but does nothing about an instance that is too large for its job.
• C. Spreading resources across Availability Zones is a resilience practice. It affects availability, not whether each resource is correctly sized.

Explanation

Answer: C. Under BYOL the customer uses software licenses they have already purchased to run that software on AWS. The alternative is a license-included model, in which AWS holds the license and its cost is bundled into the service rate, so the customer buys nothing separately from the vendor.

• A. AWS Support provides technical guidance and case handling. It does not grant third-party software licenses.
• B. Licensing obligations do not disappear in the cloud. Vendor terms continue to apply and some require specific tenancy arrangements.
• D. That describes license-included, which is the opposite arrangement.

Explanation

Answer: C. Data center and facilities costs, which include space, cooling, power, racks, uninterruptible power supplies, cabling, and physical security systems, are borne by AWS once the workload runs in an AWS Region. Companies frequently overlook these when comparing costs because they are often carried in a facilities budget rather than an IT budget.

• A. End-user devices remain the company's responsibility regardless of where its server workloads run.
• B. Developers are still needed to build and maintain the application. Migration changes where the workload runs, not who writes it.
• D. Corporate insurance is a general business expense unrelated to where a workload is hosted.

Explanation

Answer: B. TCO exists because a purchase price is a poor basis for comparison. It adds the costs that accumulate over the life of the option, such as facilities, power and cooling, network links, software licensing, maintenance contracts, and refresh cycles, so that an on-premises option and a cloud option are compared on the same footing.

• A. Cloud charges alone would ignore the on-premises side of the comparison entirely, which defeats the purpose of a TCO exercise.
• C. Hardware purchase price is only the first line. It typically understates the true cost by a wide margin once facilities and operations are counted.
• D. Expected revenue belongs to a return on investment or business case calculation. TCO measures cost, which is one input to that.

Explanation

Answer: D. Adopting a consumption model means paying only for the resources you consume and increasing or decreasing usage with business need. AWS uses this exact example: an environment needed 40 hours a week rather than 168 can be stopped when idle, for a potential saving of around 75 percent.

• A. Prices vary between Regions, but moving a development environment across the world for a small rate difference adds latency for the team and does nothing about the 128 idle hours each week.
• B. Versioning protects against accidental overwrite and deletion, and it increases storage consumed. It is a data protection feature, not a cost reduction.
• C. A larger instance costs more per hour. Unless the tests are genuinely compute bound and the environment is then stopped, this usually raises the bill.

Explanation

Answer: B. Server hardware is only one line in the on-premises current operating model. A complete comparison must also include data center and facilities costs such as space, power, cooling, racks and uninterruptible power supplies, network services such as wide area links and VPNs, application and infrastructure software licensing, and the refresh and maintenance cycle for the hardware itself. Omitting them systematically understates the on-premises option.

• A. Tax treatment differs between capital and operating spending, but that is a separate accounting consideration and not why this comparison is incomplete.
• C. The outcome depends entirely on the workload and how it is architected. The problem here is the incomplete method, not a predetermined result.
• D. AWS publishes prices that can and do change, and AWS has reduced prices many times. Price stability is not the flaw in the comparison.

Explanation

Answer: C. Rightsizing comes before commitment. Committing to three years of an oversized instance locks in the waste at a discount, whereas resizing first reduces the baseline and any commitment is then made against what the workload actually needs. Fixing the size and then buying the commitment compounds two savings; doing it in the other order does not.

• A. A cheaper Region reduces the rate slightly but leaves the fleet oversized, and it may add latency for users and complicate the architecture.
• B. Adding instances raises cost and lowers utilization further. Utilization is a symptom to fix, not a number to drive down.
• D. A discount on the wrong size still pays for capacity that is never used, and the commitment makes it harder to correct later.