Domain 4: Design Cost-Optimized Architectures

Question 1

AWS Organizations

Answer 1

Consolidate different accounts under one organization to centralize billing

Question 2

Billing Alarms

Answer 2

The alarm triggers when your account billing exceeds the threshold you specify. It triggers only when actual billing exceeds the thresholds. It doesn’t use projections based on your usage so far in the month.

Question 3

Trusted Advisor Benefits

Answer 3

• Cost optimization
• Performance
• Security
• Fault tolerance
• Service limits

Question 4

AWS Cost Explorer

Answer 4

Explains how you are spending money on your account, can show past, and hourly/daily

Question 5

EC2 Purchase Option- On-demand Instances

Answer 5

Pay by the second for the instances you launch

• low cost and flexible
• no upfront payment or long term commitment
• Applications with short term, spiky or unpredictable workloads, cannot be interrupted
• Applications being developed or tested on EC2 for first time

Question 6

EC2 Purchase Option- Savings Plan

Answer 6

Reduce your Ec2 costs by making a commitment to a consistent amount of usage, in USD per hour
-1 or 3 year term

Question 7

EC2 Purchasing Option- Reserved Instances

Answer 7

Reduce your EC2 costs by making a commitment to a consistent instance configuration, including instance type and Region

• 1 or 3 year term
• Applications with steady state usage
• Applications that require reserved capacity

Question 8

EC2 Purchasing Option- Scheduled Instance

Answer 8

Purchase instances that are always available on the specified recurring schedule,
-one year term

Question 9

EC2 Purchasing Option- Spot Instance

Answer 9

Request unused EC2 instances, bidding

• Applications that have flexible start and end times
• Applications that are only feasible at very low compute prices
• Users with urgent computing needs for large amounts of additional capacity

Question 10

EC2 Purchasing Option- Dedicated Hosts

Answer 10

Pay for a physical host that is fully dedicated to running your instances, and bring your existing per-socket, per-core, or per-VM software licenses to reduce costs

• Can be purchased On-Demand (hourly)
• Can be purchased as a reservation for up to 70% off the On-Demand price

Question 11

EC2 Purchasing Option- Dedicated Instances

Answer 11

Pay by the hour for instances that run on single tenant hardware

Question 12

EC2 Purchasing Option- Capacity Reservation

Answer 12

Reserve capacity for your EC2 instances in a specific AZ for any duration

Question 13

Storage Class Analysis

Answer 13

Amazon will help you in choosing the right storage class

Question 14

Storage Classes for frequently accessed objects

Answer 14

• S3 standard

- Reduced redundancy (RRS)

Question 15

S3 Storage Class- S3 Standard

Answer 15

Default storage class, Frequently accessed data

Question 16

S3 Storage Class- S3 Standard IA

Answer 16

Long-lived infrequently accessed data

Question 17

S3 Storage Class- S3 Intelligent Tiering

Answer 17

Long-lived data with changing or unknown access patterns

Question 18

S3 Storage Class- S3 One Zone IA

Answer 18

Long lived, infrequently accessed, non-critical data

Question 19

S3 Storage Class- S3 Glacier

Answer 19

Long term data archiving with retrieval times ranging from hours to minutes

Question 20

S3 Storage Class- S3 Glacier Deep Archive

Answer 20

Archiving rarely accessed data with a default retrieval time of 12 hours

Question 21

S3 Storage Class- RRS

Answer 21

• Reduced Redundancy,

- Frequently access non-critical data (not recommended)

Question 22

When to use S3?

Answer 22

You need to store images uploaded by users to a website, S3 is perfect since it’s Object storage.
-Good for storing files

Question 23

When to use EBS?

Answer 23

EBS is best used as attached storage for an EC2 instance or similar. Since it is a block storage and should be thought of like hard drives in a PC.
-Good for creating a filesystem, then using it attached to some compute resource

Question 24

When to use RDS?

Answer 24

• You want an automated and cost-effective solution
• AWS will take care of your database from end-to-end with automated processes for configuring, managing, maintaining, and securing.