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Consider the following scenario.

Recall that the Tailwind Traders' Special Orders application includes two virtual machines, Azure Load Balancer, and Azure SQL Database:

Here's the service-level agreement (SLA) for each service:

Service

SLA

Azure Virtual Machines

99.9 percent

Azure SQL Database

99.99 percent

Azure Load Balancer

99.99 percent

To compute the composite SLA for a set of services, you multiply the SLA of each individual service. Recall that the existing composite SLA is:

$${99.9\% \times 99.9\% \times 99.99\% \times 99.99\% = 99.78\%}$$

The team wants to add a mapping feature so that it can calculate routes between nearby suppliers and each retail store. For that, the team will use Azure Maps.

The team also needs more processing power to keep up with demand. For that, it will add a third virtual machine to the pool.

Here's a diagram that shows their proposed plan:

Recall that you can access SLAs from Service Level Agreements.

Tailwind Traders is also considering using an augmented reality service in the Special Orders app to help customers visualize their customizations. This Azure service is currently in the public preview phase.

Choose the best response for each question. Then select Check your answers.

Check your knowledge

1.

What's the SLA for Azure Maps in terms of guaranteed uptime?

99 percent

99.9 percent

99.99 percent

2.

What's the new composite SLA? Remember, the new SLA includes a third virtual machine and Azure Maps.

99.58 percent

99.78 percent

99.99 percent

3.

Adding a third virtual machine reduces the composite SLA. How can Tailwind Traders offset this reduction?

Increase the size of each virtual machine.

Deploy extra instances of the same virtual machines across the different availability zones in the same Azure region.

Do nothing. Using Azure Load Balancer increases the SLA for virtual machines.

4.

What approach might the company take in adding the augmented reality (AR) preview service to its architecture?

The Special Orders app is already in production. The company shouldn't look into the AR service until the service reaches general availability (GA).

The Special Orders app is mainly for use by retail employees. The company can integrate the AR service now because potential downtime or failures aren't an important factor.

The development team can create a prototype version of the app that includes the AR service that it can then test out with select retail employees.

You must answer all questions before checking your work.

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