EC2

Question 1

Persistent storage

Answer 1

EBS volumne

Question 2

Temporary storage

Answer 2

Instance store
Physically attached to EC2 instance

Question 3

What do you need in order to have a static IPv4 address?

Answer 3

An elastic IP address

Question 4

ENI

Answer 4

Elastic network interface
Virtual network card for EC2 instance
Used by interface endpoints

Question 5

Advantages of a placement group

Answer 5

Minimize correlated failures
Lower network latency
Achieve high throughput

Question 6

What is a placement group

Answer 6

A group of interdependent instances

Question 7

Cluster Placement Group

Answer 7

Packs instances close together inside an AZ
Low latency (think HPC)
Recommended when the majority of network traffic is between instances (tightly coupled node-to-node communication)
Can span peered VPCs within same region

Question 8

Partition Placement Group

Answer 8

• Instances in one partition do not share the underlying hardware with instances in different partitions
• Used by large distributed and replicated workloads such as Hadoop, Cassandra, and Kafka
• Maximum of 7 partitions per AZ
• Can span multiple AZ in the same region

Question 9

Spread Placement Group

Answer 9

• Puts instances on different racks to reduce correlated failures
• Can span multiple AZ in same region. Cannot span regions.
• Max of 7 instances per AZ per group
• Can span multiple AZ in the same region

Question 10

Elastic Inference Accelerators

Answer 10

Enable customers to attach low-cost GPU-powered acceleration to EC2 and Sagemaker

Question 11

Dedicated Host

Answer 11

• Per host billing
• Provides visibility on the number of sockets and physical cores
• Allows you to deploy your instances to the same physical server over time
• Provides additional visibility and control over how instances are placed
• Bring Your Own License (BYOL)

Question 12

User data

Answer 12

Commands that are executed when an EC2 instance launches

Question 13

Security Groups

Answer 13

Operate at the instance layer
Firewalls for the instance
Control inbound and outbound traffic
If an AWS service involves instances, it also supports security groups

Question 14

Security Groups

Answer 14

Operate at the instance layer
Firewalls for the instance
Control inbound and outbound traffic
If an AWS service involves instances, it also supports security groups

Question 15

Nitro-based instances

Answer 15

Bare metal capabilities that eliminate virtualization overhead and support workloads that provide full acesss to host hardware
Can support 64K IOPS per EBS provisioned IOPS volume compared to 32K for other instance types

Question 16

EBS Provisioned IOPS

Answer 16

Highest performing EBS volumes designed for critical I/O intensive applications
Ideal for IOPS-intensive and throughtput-intensive workloads that require extremely low latency

Question 17

Dedicated Instances

Answer 17

Pay‬‭ by‬‭ the‬‭ hour‬‭ for‬‭ instances‬‭ that‬‭ run‬‭ on‬‭ single-tenant‬‭ hardware.‬‭
Dedicated‬ Instances‬‭ that‬‭ belong‬‭ to‬‭ different‬‭ AWS‬‭ accounts‬‭ are‬‭ physically‬‭ isolated‬‭ at‬‭ a‬‭ hardware‬‭ level.‬‭
No visibility into number of sockets or physical cores
‭Can’t BYOL (bring your own license)

Question 18

Placement Group Limitations

Answer 18

• Can’t merge placement groups
• An instance cannot span multiple placement groups
• Cannot launch Dedicated Hosts in placement groups
• Placement groups can’t span multiple AZs

Question 19

What does an IAM role do for your instance?

Answer 19

Gives it permission to interact with other AWS resources