Free CLF-C02 flashcards

How can you script the launch of many identical Amazon EC2 instances and re-run that launch automatically on a schedule?

Use the AWS Command Line Interface (AWS CLI). It exposes AWS service operations as terminal commands, so the launch can be embedded in a shell script and re-run by a scheduled job. This gives repeatable, automated provisioning that a point-and-click graphical console cannot.

Which part of the AWS global infrastructure do you choose to keep application data physically stored within a required country for data residency?

An AWS Region. Each Region is a separate, named geographic area, and resources deployed into it stay within that geography. Selecting a Region inside the required country is how a data residency requirement is met.

Common misconceptionThat picking an Availability Zone is how you set the country your data sits in. The Region fixes the geography; zones only divide resources inside it.

On Amazon EC2, who patches the guest operating system, and why?

The customer does. Amazon EC2 is an infrastructure service where the responsibility boundary sits at the guest OS, so patching, updating and hardening that OS is the customer's job. AWS secures the hardware, hypervisor and facilities beneath that boundary.

In the AWS shared responsibility model, what does "security OF the cloud" cover?

The physical hardware, facilities and global infrastructure that runs every AWS service. AWS operates and protects these on behalf of all customers. Customers instead handle security IN the cloud, such as their data and access controls.

Common misconceptionThat the data you put in Amazon S3 and its access settings are covered by security OF the cloud. Buckets and their permissions stay yours to set.

What cloud benefit lets AWS lower its prices as it aggregates the usage of hundreds of thousands of customers?

Economies of scale. Because many customers share the same platform, AWS reaches a far higher purchasing volume than any single firm, lowering its unit costs, and it passes those savings on through lower pay-as-you-go prices.

Why does the pay-as-you-go model of the AWS Cloud suit a startup that is unsure how many customers it will attract?

It trades a large upfront capital expense for a variable expense tied to usage. The startup consumes resources on demand and pays only for capacity it actually uses, so it avoids buying a server fleet before launch and matches spend to real demand.

Common misconceptionThat AWS handles all security once you migrate, so no controls are needed. Customers still secure their own data, access and configuration.

Which Amazon EC2 pricing model gives the deepest discount for a fault-tolerant batch job that can stop and resume safely?

Spot Instances. They sell spare AWS capacity at the steepest discount on the condition that AWS may reclaim it with little warning, which is acceptable for interruptible batch work designed to pause and restart without losing progress.

Which Amazon EC2 pricing model gives the lowest hourly rate for a steady, always-on workload expected to run for years?

Reserved Instances. Committing to a one-year or three-year term lets AWS offer a much lower hourly rate than On-Demand, so a stable workload running continuously for years pays far less than the standard rate.

Common misconceptionThat On-Demand is cheapest because you only pay for what you use. Paying the full standard rate for years costs far more than a one-year or three-year commitment.