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Flashcards in AWS Essentials Deck (31)
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1

What three things does an AWS account provide? Aside from those, what incidental protection does an account give an account holder?

A way to authenticate, authorize, and bill. An account automatically limits the blast radius for resources within a specific account.

2

What is a principal?

An entity which can log into an AWS account.

3

What does a principal need to do to interact with a system?

Authenticate.

4

What mechanism does AWS use to authenticate and authorize principals?

IAM

5

If a system has mitigated the effects of component failure and/or reduced the downtime required to recover after component failure, it can be said to be

Highly available

6

If a system can continue to function despite the failure of a critical component, it can be said to be

Fault tolerant

7

Which is easier to build and architect: a highly available system, or a fault tolerant system?

A highly available system is easier to build. Also less expensive.

8

What is the process by which a completely failed system protects critical system data to build a new system in the event of failure?

Disaster recovery

9

Do you need a DR plan if you've carefully crafted a HA or FT system?

Definitely.

10

When evaluating a DR solution, the term that identifies the maximum allowable timeframe between system failure and the restoration of the system to an operational state.

RTO - Recovery Time Objective

11

When evaluating a DR solution, the term that identifies the total amount of data you'll lose based on time between failure and last successful backup.

RPO - Recovery Point Objective

12

If data is local to a resource and is lost when the resource is released, it can be considered

Ephemeral

13

If data exists in a secondary location as it's passed between sources, it can be considered

Transient

14

If data exists in a durable location which can survive system starts, stops, restarts, or power events, it can be considered

Persistent

15

What's an example of an ephemeral data store

Instance store volume, cache

16

What's an example of a transient data store

Queues (SQS, MQ), Kinesis Data Streams

17

What's an example of a persistent data store

EBS, EFS, S3

18

What's a common advantage of ephemeral storage

Speed!

19

What's a common disadvantage of persistent storage

Lack of speed, compared to ephemeral volumes.

20

What's the most common reason transient storage is used

Decoupling application components to help drive HA/FT designs

21

What OSI layer represents the software stored on your device, and is capable of communicating in binary across a shared medium?

1 - Physical

22

What OSI layer provides the ability to address devices uniquely, using a MAC address?

2 - Data link

23

What OSI layer adds IP addresses?

3 - Network

24

Is IP designed to be reliable?

Nope. Doesn't test for receive, doesn't account for ordering.

25

What OSI layer adds TCP and UDP protocols?

4 - Transport

26

What special capacity does the Transport layer enable?

Receipt confirmation and data ordering (via tcp/udp)

27

What OSI layer adds ports?

5 - Session

28

What special capacity do ports enable?

Multiple conversations (via multiple ports)

29

What OSI layer generally adds encryption?

6 - Presentation

30

What OSI layer generally implements standards of data exchange?

6 - Presentation

31

What OSI layer generally implements data transmission protocols?

7 - Application (think HTTP, FTP, etc)