AWS Cloud Practitioner Exam with Questions and Answers.

AWS Cloud Practitioner Exam with Questions and Answers




AWS Cloud Practitioner Exam with
Questions and Answers
Question 1

What is Multitenancy?

Correct Answer
Idea of sharing underlined hardware between virtual machines -> hypervisor is
responsible for coordinating multitenancy; 1 EC2 is not aware of another EC2 on the
same host.



Question 2
Name EC2 instance types & families and describe them
Correct Answer
Instance types offer different combinations of CPU, memory, storage, networking
capacity; they are grouped under families

- General purpose: good balance for diverse workflows (web servers, code
repositories)
- Compute optimized: ideal for compute intensive tasks (gaming servers, high
performance computing HPC, scientific modeling)
- Memory optimized: memory intensive tasks
- Accelerated computing: good for floating point numbers calculations, graphic
processing, data pattern matching, as they use utilize hardware accelerators
- Storage optimized: good for high performance for locally stored data



Question 3
What is EC2?
Correct Answer
Elastic Compute Cloud - A VM, hosted in AWS instead of a personal data center




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, AWS Cloud Practitioner Exam with Questions and Answers




Question 4
Describe pricing of EC2 instances
Correct Answer
- On-demand: pay only for time when EC2 runs

- Savings plan: low prices for EC2 in exchange for commitment for specific price and
amount of time of EC2 instance usage (dollar/hour) for next 1 or 3 years => the
commitment to spend a particular dollar amount per hour over a specific period

- Reserved instances: suited for steady workflows, commitment for 1 or 3 year term
and payment (payment options: all upfront, partial upfront, no upfront) => the
commitment to use an instance at a particular price over a specific period,

- Spot instances: 90% off demand price, AWS can reclaim instance when they need
it in short time period, good for workflows that can be interrupted

- Dedicated hosts: host dedicated only for your EC2



Question 5
Explain EC2 auto scaling
Correct Answer
EC2 Auto Scaling - adds instances based on demand and then removes instances
when they are no longer needed
2 types of scaling:
- scale vertically: add more power to the machines when they are running
- scale horizontally: multiply the number of instances

for EC2 Auto Scaling (allows to set automated horizontal scaling) we can set:
- minimum capacity
- desired capacity
- maximum capacity




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, AWS Cloud Practitioner Exam with Questions and Answers




Question 6
What is ELB?
Correct Answer
Elastic Load Balancing service (ELB) - managed service, runs on region level, ELB is
automatically scalable to handle additional throughput; it communicates with EC2
instances
-> Can communicate front end with back end - to manage the traffic.

Load balancing: takes requests and routes them the instances to be processed
- main task: properly distribute traffic



Question 7
What is SQS?
Correct Answer
Amazon Simple Queue Service (SQS): send, store, receive messages between
software components at any volume
- Payload: data contained within the message, stored until processed
- SQS queues: where messages are placed until they are processed
- example of loosely coupled architecture: single failure won't cause cascading
failures in processing



Question 8
What is SNS?
Correct Answer
Amazon Simple Notification Service (SNS): used to send out messages, notifications,
uses pub-sub module
- SNS topic: channel for messages to be delivered, subscribers will receive message
placed there



Question 9
What does 'serverless compute option' mean? Give an example
Correct Answer
You cannot see or access the underlying infrastructure or instances that are hosting
your app; so everything (patching, scaling) is taken care of by AWS
e.g.: AWS Lambda, AWS container services




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, AWS Cloud Practitioner Exam with Questions and Answers




Question 10
What is AWS Lambda?
Correct Answer
AWS Lambda - server less compute option
- service that allows to create lambda function from your code, configure the trigger
- when trigger is detected the code is run in the prepared environment
- lambda is automatically scalable (when a lot of incoming triggers)
- designed to run code under 15 mins, so for fast responses



Question 11
What are AWS container services? Explain and provide examples
Correct Answer

AWS container services: container orchestration tools

-> container = a docker container

-> container = package for your code, with dependencies, configs etc., these
containers run on the top of EC2 and run in isolation from each other, but host is
EC2 instance

e.g.:

1. Amazon Elastic Kubernetes service (EKS)

2. AWS Elastic Container Service (ECS): container orchestrator (number of containers
= cluster), ECS is designed to run containerized apps at scale without managing
own container orchestration software




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