Azure AZ-900 Questions and Answers
High Availability
Application and it's systems are accessible most of the time. (High 90 percentile over any given time)
Application availability
Application and systems it uses are accessible by users
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Azure AZ-900 Questions and Answers
High Availability - answer Application and it's systems are accessible most of the
time. (High 90 percentile over any given time)
Application availability - answer Application and systems it uses are accessible by
users
What makes an application unavailable? - answer - Network Outage
- Application Failure
- System Outage (VM)
- Power Outage
- Problem with reliant system (Database)
Service Level Agreement (SLA) - answer Specifies the availability percentage of a
service and the cloud provider guarantees that the service will meet the SLA.
What if a cloud service does not meet a SLA? - answer If it is within the control of the
cloud provider, customers are usually entitled to some level of refund.
What adds additional resources? - answer Scaling out or Horizontal scaling
What adds more powerful resources? - answer Scaling up or vertical scaling
Scaling - answer Process of adding additional resources or power for your
application
Elasticity - answer Concept of automatically scaling
Agility - answer Provides speed and flexibility within the cloud
Fault tolerence - answer Happens without user interaction and is designed to
automatically move you from an unhealthy system to a health one
Disaster Recovery - answer Having reliable backups for important data
- Commonly referred to BCDR
Microsoft carefully monitors the Azure infrastructure to reduce any impact of ________
_________ failures - answer small scale
On-premises model - answer Business purchases physical computer hardware to be
used for its IT needs
, Computers are physical assets that are intended to be used for more than one year,
they are usually purchased as _________ ____________ - answer Capital
Expenses
When you move to the _____________ _______________, you no longer rely on your
on-premises computing hardware. Instead, you essentially rent hardware from the cloud
provider - answer Cloud Model
When you aren't purchasing physical assets, you move your IT costs from capital
expenses to ____________ _______________ - answer operating expenses
Principle of economies of scale - answer Reduction in cost due to purchasing a large
number of resources
Consumption-based model - answer Offering the ability to use only those computing
resources you require at any particular time
What is required for on-premises applications? - answer - Physical computer
hardware
- Network infrastructure
- Storage areas for server racks etc.
** These are capital expenses **
What shifts expenses from capital expenses to operating expenses? - answer Cloud
model
What are the three primary types of cloud services? - answer IaaS, PaaS, SaaS
Each type of service comes with a different level of responsibility on your part, and this
concept is often referred to as? - answer Shared responsibility model
Infrastructure-as-a-Service (IaaS) - answer Requires you to control both the
operating system and middleware components along with your application
- Most popular IaaS in Azure is Azure VM
Platform-as-a-Service (PaaS) - answer Cloud provider assumes a lot of responsibility
for the infrastructure but the application and most of the configs of the apps is the users
responsibility
- Commonly used PaaS service is Azure App Service
Middleware - answer Cloud provider still provides the infrastructure for you, but they
also provide the operating system, software installed in the operating system to help
you connect to databases and network systems
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