This document is based on an udemy course that explains all the topics in the AZ-900 certification exam. The summary contains images for further explanation, it contains examples and with every chapter there are three exam questions included with the answers.
Azure AZ-900 certificaat
samenvatting
Lesson 1 Course and exam
The AZ-900 exam has three main objectives. For the exam, go to the Microsoft az-900 page and look for
skills measured. The certification is for life.
1) Describe cloud concepts (25-30%)
2) Describe azure architecture and services (35-40%)
3) Describe azure management and governance (30-35%)
Lesson 2 Describe cloud computing
Cloud concepts
Cloud computing is basically someone else’s computer. In this case it’s Microsoft azure that owns all the
computing services that you end up renting. You only pay for what you use. There are 1000+ azure
services. To see this, go to portal.azure.com and create a free account.
Shared responsibility model: this is basically how Microsoft, and you as the customer have divided your
responsibilities for all sorts of things including security. Your responsibility for on premises (have your
own computer) = everything. One of the benefits of the cloud model is that you are able to hand off
some of the responsibilities to a company such as azure.
,There are three types of cloud platforms: public, private and hybrid cloud.
Public cloud: a cloud platform that is available for the general public. “The public cloud is defines as
computing services offered by third party providers over the public internet, making them available to
anyone who wants to use or purchase them.” So, azure owns the hardware, on their network and
infrastructure and making them available to anyone to rent those services.
Private cloud: “defined as computer services offered either over the internet or a private internal
network and only to select users instead of the general public.” you need to be invited to be a part of.
It looks and acts like a cloud, except the customer owns or leases or has exclusive access to the hardware.
,Hybrid cloud: mixture between public and private. “computer environment that combines a private cloud
with a public cloud. “ scale private infrastructure to the cloud.
Cloud pricing
Cloud pricing can be complicated. Cloud pricing can also be considered a downside to cloud computing.
- It is difficult to predict your monthly bill
- It is difficult to understand in advance what a service really cost.
- Possibility for big savings but you lose predictability
Microsoft does have free services (55+) that can be used as part of your solution. Sometimes it is just
paid services that have free tiers, or it will have limits.
Within azure, the most common way you get charged is by the hour, by the month, so by time. When you
are paying for time, you can stop the charges by stopping the service.
You also usually pay for example for storage. Then you pay per GB and not in time.
You often pay for operations for certain services. Operations are: read, write, list, delete. You will pay per
message, pay per query to a database, etc. Usually it is extremely cheap to pay per operation.
These are just three of the metrics you can be charged for. There are other types of metrics as well.
Oefenvragen
- What are the responsibilities of the customers according to the shared responsibility model?
Patching guest OS and applications: the cloud provider is always responsible for the physical
infrastructure and devices. In an IaaS model, customer is responsible for patching guest OS and
applications.
- In which cloud model can an organization offload its entire physical hardware responsibilities,
potentially allowing it to shut down its on-premises data center?
A public cloud. An organisation can close its DC by hosting its infrastructure in a public cloud.
The public cloud is defined as computing services offered by third-party providers over the
public Internet, making them available to anyone who wants to use or purchase them. The
private cloud is defined as computing services offered either over the Internet or a private
internal network and only to select users instead of the general public. A private cloud can be
deployed on-premise or in a third-party hosted environment. A hybrid cloud combines the use
of both public and private clouds.
- A company has distributed its workload on both the azure cloud an some on premises servers.
What type of architecture is this?
Hybrid cloud. A hybrid cloud is a type of cloud computing that combines on premises
infrastructure (or a private cloud) with a public cloud.
, Lesson 3 Benefits of cloud computing
High availability: availability by itself can also be called uptime. It is the amount of time that your system
is available to serve users in a normal fashion. The concept of high availability (HA) is the ability of a
system to remain operational to users during planned or unplanned outages. Planned outages are for
example:
- Operating system security patches
- Application updates
- Hardware replacement
- Migrating to a new hosting provider.
What can you do to mitigate or avoid planned outages?
- Gradual deployment strategy (1-10-100, etc)
- Testing and monitoring of deployment
- Easy rollback plan
- Small deployments
- Frequent deployments
- Automation
Methods to mitigate unplanned outages:
- Every single component has redundancy.
- User azures built-in features for availability (availability sets, zones and cross region load
balancing)
- Constant health monitoring/probes
- Automation
- Having strong security patches
- Be geographically distributed
- Have a disaster recovery plan
- Test this disaster recovery plan
- Load testing
To sum up: HA is a conscious effort to avoid the obvious source of downtime.
Scalability: the ability of a system to accommodate increasing demand by adding or removing resources
as needed. what is the benefit of scalability? It allows a system to adapt to changing usage patterns and
handle increased traffic without requiring changes to the application code or system design.
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