CSLB General Building (B) — All Questions

Which statement best describes the primary financial benefit of moving from an on-premises data center to the AWS Cloud?

• a.It eliminates all costs associated with running applications
• b.It trades large upfront capital expenses for variable operating expenses that scale with usage✓
• c.It guarantees that monthly bills will never change month to month
• d.It removes the need to monitor how many resources you consume

Cloud computing lets organizations avoid large upfront investments in hardware (CapEx) and instead pay only for the resources they actually use (OpEx). This variable cost model scales up or down with demand. Costs are not eliminated, and usage should still be monitored.

A company can provision hundreds of servers in minutes and release them just as quickly when demand drops. Which cloud benefit does this describe?

• a.Agility and elasticity✓
• b.Fixed capacity planning
• c.Manual hardware procurement
• d.Long-term data-center leasing

Elasticity is the ability to acquire resources as you need them and release them when you no longer need them, in minutes rather than weeks. Combined with agility, this lets teams experiment and innovate faster than with traditional infrastructure.

Because AWS aggregates usage from hundreds of thousands of customers, it can pass lower per-unit prices on to each customer. What is this advantage called?

• a.Elastic load balancing
• b.High availability
• c.Economies of scale✓
• d.Fault tolerance

Massive aggregated usage lets AWS achieve higher economies of scale, which translates into lower pay-as-you-go pricing for customers. Individual organizations could not achieve the same purchasing power on their own.

Which of the following is a pillar of the AWS Well-Architected Framework?

• a.Marketing effectiveness
• b.Vendor lock-in
• c.Headcount reduction
• d.Operational excellence✓

The Well-Architected Framework has six pillars: operational excellence, security, reliability, performance efficiency, cost optimization, and sustainability. Operational excellence focuses on running and monitoring systems to deliver business value.

Which Well-Architected pillar focuses on using computing resources efficiently and avoiding unnecessary spending?

• a.Reliability
• b.Cost optimization✓
• c.Security
• d.Operational excellence

The cost optimization pillar helps you run systems that deliver business value at the lowest price point, such as by choosing the right pricing model and eliminating idle resources. Reliability and security address different concerns.

A newer pillar of the AWS Well-Architected Framework addresses the long-term environmental impact of cloud workloads. Which pillar is this?

• a.Sustainability✓
• b.Scalability
• c.Portability
• d.Compatibility

Sustainability is the sixth pillar, added to help customers understand and minimize the environmental impacts of running cloud workloads. It encourages maximizing utilization and reducing the resources required.

What does the term 'high availability' mean for a system running in the cloud?

• a.The system uses the cheapest possible resources
• b.The system stores data in a single location
• c.The system remains operational and accessible for a very high percentage of time✓
• d.The system can only be accessed by administrators

High availability means a system is designed to stay up and reachable with minimal downtime, often by removing single points of failure. On AWS this is commonly achieved by spreading resources across multiple Availability Zones.

Which deployment model describes running some workloads on-premises while integrating with services in the AWS Cloud?

• a.Multi-region deployment
• b.Pure public cloud
• c.Serverless deployment
• d.Hybrid cloud✓

A hybrid deployment connects cloud resources with on-premises infrastructure, often used when data must remain local or during a gradual migration. A pure cloud model runs everything in the cloud.

Which of the following best defines scalability in the context of cloud computing?

• a.The ability to encrypt data at rest
• b.The ability of a system to handle increased load by adding resources✓
• c.The ability to restrict user permissions
• d.The ability to generate monthly invoices

Scalability is a system's capacity to grow to meet increased demand, either by adding more resources (horizontal) or larger resources (vertical). Elasticity extends this by automatically scaling in and out with demand.

A startup wants to launch a product globally without building data centers in each country. How does the AWS global infrastructure help?

• a.It lets the company deploy applications close to users in many geographic Regions✓
• b.It requires the company to pick a single country for all users
• c.It forces all traffic through one physical building
• d.It removes the ability to choose where data is stored

AWS operates Regions around the world, so companies can deploy applications near their users to reduce latency and meet local requirements. Customers choose which Regions to use for their workloads.

Which statement correctly contrasts vertical scaling with horizontal scaling?

• a.Vertical scaling adds more instances; horizontal scaling makes an instance smaller
• b.Both terms mean the same thing
• c.Vertical scaling increases the size of a single resource; horizontal scaling adds more resources✓
• d.Horizontal scaling only applies to databases

Vertical scaling (scaling up) increases the capacity of an individual resource, such as moving to a larger instance type. Horizontal scaling (scaling out) adds more resources, such as more instances behind a load balancer.

Which characteristic of cloud computing allows a developer to obtain compute and storage resources without human interaction with the provider?

• a.Measured billing
• b.Resource pooling
• c.Broad network access
• d.On-demand self-service✓

On-demand self-service means users can provision resources automatically through a console or API whenever needed, without contacting the provider. This is a defining feature of cloud computing.

How does the cloud improve an organization's ability to experiment and innovate?

• a.Low-cost, fast provisioning lowers the risk and cost of trying new ideas✓
• b.It requires a multi-year commitment before any test can begin
• c.It mandates that every experiment run in a physical lab
• d.It prevents teams from deleting resources

Because resources can be spun up quickly and released when done, the cost of failure is low. Teams can test ideas rapidly and shut them down without wasted hardware, encouraging innovation.

Which Well-Architected pillar is primarily concerned with a workload's ability to recover from failures and meet demand?

• a.Cost optimization
• b.Reliability✓
• c.Sustainability
• d.Performance efficiency

The reliability pillar focuses on ensuring a workload performs its intended function correctly and consistently, including recovering from disruptions and dynamically acquiring resources to meet demand.

A company no longer wants to spend time racking, stacking, and powering servers so it can focus on its customers. Which cloud value proposition does this reflect?

• a.Paying more for less capacity
• b.Increasing time spent on undifferentiated tasks
• c.Stop spending money running and maintaining data centers✓
• d.Guaranteeing zero latency worldwide

A key benefit of cloud is to stop spending money on the undifferentiated heavy lifting of running data centers and instead focus on projects that differentiate the business, such as serving customers.

Which cloud computing service model provides virtualized computing resources such as servers, storage, and networking that the customer manages?

• a.Software as a Service (SaaS)
• b.Function as a Service
• c.Platform as a Service (PaaS)
• d.Infrastructure as a Service (IaaS)✓

IaaS provides the fundamental building blocks of cloud IT (compute, storage, networking) and gives the customer the most control over the resources. SaaS delivers a finished application, while PaaS manages the underlying infrastructure for you.

Which of the following is an example of the Software as a Service (SaaS) model?

• a.A ready-to-use, web-based email application✓
• b.A bare virtual machine you must configure yourself
• c.A raw block storage volume
• d.A physical network switch

SaaS delivers a complete, managed application that the customer simply uses, such as web-based email. The provider handles the underlying infrastructure, platform, and application maintenance.

What is meant by 'loose coupling' as an architectural best practice in the cloud?

• a.Making every component depend directly on every other component
• b.Designing components so a failure in one has limited impact on others✓
• c.Running all code on a single large server
• d.Avoiding the use of any managed services

Loosely coupled architectures reduce interdependencies so that a change or failure in one component does not cascade to others. Services like queues and load balancers help decouple components and improve resilience.

Which benefit describes AWS's ability to go global in minutes by deploying an application in multiple Regions?

• a.Reduced encryption strength
• b.Mandatory single-Region hosting
• c.Increased speed and reach for a global user base✓
• d.Elimination of all networking costs

Deploying across multiple Regions lets you place workloads closer to users worldwide, lowering latency and improving experience. This global reach can be achieved quickly without building physical infrastructure.

Which Well-Architected design principle encourages testing systems at production scale and automating to make experimentation easier?

• a.Manually provisioning all infrastructure
• b.Avoiding failure testing
• c.Keeping one large monolith
• d.Automate to make architectural experimentation easier✓

Well-Architected design principles include automating with infrastructure as code, testing at production scale, and designing for failure. Automation makes it low-cost to create and replicate environments for experimentation.

How does elasticity help a retailer that experiences large traffic spikes during holiday sales?

• a.Capacity automatically scales out during spikes and scales in afterward, matching cost to demand✓
• b.Capacity is fixed at the peak level all year, wasting money off-season
• c.The retailer must manually order servers weeks ahead of each sale
• d.Traffic spikes cause the application to be permanently oversized

Elasticity lets the retailer add capacity during peak periods and remove it when demand falls, so they pay only for what they need. This avoids both over-provisioning year-round and under-provisioning during spikes.

Which statement about the AWS shared model of benefits is correct regarding speed and agility?

• a.New IT resources are always available only after a multi-week procurement cycle
• b.Agility refers only to how fast invoices are generated
• c.In the cloud, new IT resources are a click away, reducing the time to make them available to developers✓
• d.Agility means resources can never be released

Cloud agility means developers can obtain new resources almost instantly instead of waiting weeks for hardware. This dramatically reduces the time and cost of making resources available, accelerating projects.

Which of the following best describes 'fault tolerance' in a cloud architecture?

• a.The system charges customers only for faults
• b.The system continues operating properly even when some components fail✓
• c.The system requires manual restart after any error
• d.The system stores only a single copy of data

Fault tolerance is the ability of a system to keep running correctly despite the failure of one or more of its components, often through redundancy. It is closely related to, but stronger than, high availability.

Which Well-Architected pillar focuses on using computing resources efficiently to meet requirements and maintaining efficiency as demand changes and technologies evolve?

• a.Reliability
• b.Security
• c.Cost optimization
• d.Performance efficiency✓

The performance efficiency pillar is about using computing resources efficiently to meet system requirements and sustaining that efficiency as demand shifts and technologies advance. It encourages selecting the right resource types and reviewing them over time.