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MS Azure AZ-900 Questions and Answers
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MS Azure AZ-900 Questions and Answers Cloud Computing The practice of using a network of remote servers hosted on the internet to store, manage, and process data rather than a local (on premise) server or a personal computer. Benefits of a cloud computing provider Ability to outsource cos...

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  • 2 september 2024
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MS Azure AZ-900 Questions and
Answers
Cloud Computing - answer The practice of using a network of remote servers hosted
on the internet to store, manage, and process data rather than a local (on premise)
server or a personal computer.

Benefits of a cloud computing provider - answer Ability to outsource costs and
physical server real estate to providers. You are only responsible for configuration and
code. High uptime and secure.

Dedicated Server - answer The OG approach. A single physical machine that runs a
single web-app or site. Very expensive and high maintenance. Highly customizable can
be very secure.

Virtual Private Server - answer Still one physical machine dedicated to an individual
business but can be divided into sub-machines each set to each run individual apps or
sites.

Shared Hosting - answer Still one physical machine but multiple businesses share
the costs. Relies on most tenants under-utilizing their resources. Performance can
suffer if one of these business is using a lot of resources. Very, cheap, very limited.

Cloud Hosting - answer Best of both worlds. Multiple physical machines acting as
one system (the cloud) . Flexible, scalable, secure, cost-effective, high configurability.
Speeds and capacity get significantly faster and the pricing model shifts from a fixed
cost to a pay for what you consume. Essentially, you are renting computer power and
storage from someone else's datacenter.

Common Cloud Services - answer Compute, Storage, Networking, Databases

Compute - answer Imagine having a virtual computer that can run an application,
programs and code.

Storage - answer Imagine having a virtual hard drive than can store files.

Networking - answer Imagine having a virtual network being able to define internet
connections or network isolations.

Databases - answer Imagine having a virtual database for storing a reporting data or
a database for general purpose web application.

,Software as a Service (SaaS) - answer For Customers - A product that is run and
managed by the service provider. Don't worry about how the service is maintained. It
just works and remains available. (ex: gmail, office 365)

Platform as a Service(Paas) - answer For Developers - Focus on the deployment
and management of your apps. Don't worry about provisioning, configuring, or
understanding the hardware or OS. (ex: heroku, google app engine)

Infrastructure as a Service (Iaas) - answer For Administrators - Basic building blocks
of cloud IT. Provides access to networking features, computers and data storage space.
Don't worry about IT staff, data centers and hardware. (ex: oracle cloud, azure, aws)

Cloud Deployment Models - answer Public Cloud, Private Cloud, Hybrid Cloud,
Cross-Cloud

Public Cloud - answer Everything is built on CSP.
-Most cost-effective
-Default security controls might not meet security requirements
-Limited configuration
-Easy to use
Everything is running within Azure in public cloud (aka cloud-native)
(ex: VM and database both running on a domain)

Private cloud - answer On-Premise. Everything is built on company's datacenter.
-Most expensive
-Security limited by knowledge
-Requires in-depth knowledge of all lvls of your infrastructure
Could use an open-source CSP (i.e. openstack) instead of azure.
Uses cloud service but company must manage and maintain their own servers/
datacenters.

Hybrid - answer Using both on-premise and a CSP
-Could be cost-effective based on use
-You are responsible for securing connection to the cloud
-Requires in-depth knowledge of all lvls of infrastructure and CSPs.

Cross-Cloud - answer Using multiple cloud providers (ex: amazon eks gcp
kubernetes engine

High Availability - answer (HA) is a characteristic of a system which aims to ensure
an agreed level of operational performance, usually uptime, for a higher than normal
period. Modernization has resulted in an increased reliance on these systems.

High Scalability - answer Ability to increase capacity rapidly

, High Elasticity - answer AUTO scaling and can also decrease capacity if needed
unlike scalability. (VM scale sets/ SQL Server Stretch Database)

High Durability - answer Ability to recover from a disaster and to prevent the loss of
data. (DR) Disaster Recovery

Evolution of compute - answer Dedicated, VMs, Containers, Functions

Docker Daemon - answer Software that allows you to run multiple containers with a
VM.

Serverless Compute - answer Functions. Managed VMs running managed
containers. Upload code and choose memory and duration you need to utilize.
Extremely cost-effective. Cold start side-effect.

Region - answer Grouping of multiple "availability zones (data centers)
Azure has 58 regions available across 140 countries

Geography - answer A discreet , market of two or more regions that preserves data
residency and compliance boundaries (data stays within specified borders).

Azure Geographies - answer United States
Azure Government (US)
Canada
Brazil
Mexico

Paired Regions - answer Each region is paired with another region 300 miles away
Only one region at a time is update to ensure availability
Some Azure Services rely on Paired regions for DA (eg. Azure Geo-Redundant storage)

Are all cloud services available in every region? - answer No.
Recommended regions

Recommended Regions - answer Majority of services are available

Alternate Regions - answer A region that extends Azure's footprint within a data
residency boundary where a recommended region exist. (Not designated to support
AZs.
Labeled as "other" in the Azure portal.

Service Availability Categories - answer Foundational
Mainstream
Specialized

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