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AWS Certified Solution Architect Associate > EC2 > Flashcards

EC2 Flashcards

1
Q

What are the main features/services of EC2?

A
  • Renting virtual machines (EC2)
  • Storing Data on virtual drives (ELB)
  • Scaling the services using an auto-scaling group
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2
Q

What are the configuration options for a virtual machine?

A
  • OS
  • CPU
  • RAM
  • Storage (EBS, EFS, Instance Storage?
  • Network card
  • security group
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3
Q

How can an EC2 machine be configured automatically?

A

-Through a bootstrap script at launch

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4
Q

Which special types exist for EC2?

A
  • General Purpose
  • Compute Optimized
  • Memory Optimized
  • Storage Optimized
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5
Q

How can you control traffic to/from EC2 Instances

A

Through Security Groups

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6
Q

What do security groups control?

A
  • Access to ports
  • Authorised IP ranges -IPv4 and IPv6
  • Control of inbound network
  • Control of outbound network
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7
Q

What are the default traffic rules for security groups?

A
  • All inbound traffic is blocked

- All outbund traffic is allowed

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8
Q

Which purchasing option do you choose for long term planned workloads?

A

Reserved Instances

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9
Q

Which purchasing option do you choose for cheap, short workloads that can be interrupted?

A

Spot Instances

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10
Q

What are dedicated instances?

A

No other customer will share the hardware

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11
Q

What are dediacted hosts?

A

You can book an entire physical server and control instance placement.

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12
Q

Which purchasing option do you choose for short workloads that can not be interrupted?

A

On demand instances

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13
Q

What are dedicated hosts used for?

A

It is ued to fullfill compliance when licenses are bound to hardware.

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14
Q

What is an Elastic IP?

A

An Elastic IP is a public static IPv4 IP that can be attached to an EC2 instance

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15
Q

Why avoid Elastic IPs?

A

They are often a sign for architectural decisions?

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16
Q

How to avoid Elastic IPs?

A

register a DNS to a random public IP

-use a Load Balancer

17
Q

What are the available EC2 placement groups?

A
  • Cluster
  • Spread
  • Partition
18
Q

You have a very critical application. Which EC2 placement group do you need and why?

A
  • spread
  • EC2 instances are on different physical hardware
  • instances can spread multiüle availability zones
19
Q

You have a big data job that needs to conmplete fast. Which placement group to use and why?

A
  • cluster

- instances are in the same rack and connected via very low latency and high speed network

20
Q

What are elastic network interfaces?

A

They are virtual network cards that can be attached to EC2 instances

21
Q

What is EC2 Hibernate and how does it work?

A

The RAM of an EC2 instance is written to an EBS storage and written back to RAM on reboot

22
Q

What is a vCPU?

A

A cpu thread.

23
Q

What is an EBS volume?

A

a network drive that can be attached to an ec2 instance

24
Q

How are you billed for an EBS volume?

A
  • size in GBs

- IOPS

25
Q

How can EBS be backuped?

A

You create snapshots in s3

26
Q

How can you standardize your EC2 configurations quickly at launch?

A

Through AMIs (Amazon Machine Images).

27
Q

What if an EBS has too high latency?

A

Use EC2 Instance Store (Machine integrated storage)

28
Q

Are EBS volumes encrypted?

A

Yes.

29
Q

How can EBS fault tolerance be improved?

A

By combining 2 or more volumes in a RAID0 or RAID1 array

30
Q

What is efs?

A

Elastic file system is a network file system that can be mounted to multiple ec2 instances across multiple availability zones. It can scale dynamically.

31
Q

When to use ebs vs efs?

A

EBS: low-latency interactive applications that require consistent, predictable performance

EFS: used for storing large amounts of data that needs to be accessed fast and can not be stored on one EBS volume on one ec2 instance

AWS Certified Solution Architect Associate (11 decks)

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