AWS Essentials Flashcards

1
Q

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

A

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

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2
Q

What is a principal?

A

An entity which can log into an AWS account.

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3
Q

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

A

Authenticate.

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4
Q

What mechanism does AWS use to authenticate and authorize principals?

A

IAM

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5
Q

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

A

Highly available

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6
Q

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

A

Fault tolerant

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7
Q

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

A

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

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8
Q

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

A

Disaster recovery

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9
Q

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

A

Definitely.

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10
Q

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.

A

RTO - Recovery Time Objective

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11
Q

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.

A

RPO - Recovery Point Objective

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12
Q

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

A

Ephemeral

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13
Q

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

A

Transient

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14
Q

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

A

Persistent

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15
Q

What’s an example of an ephemeral data store

A

Instance store volume, cache

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16
Q

What’s an example of a transient data store

A

Queues (SQS, MQ), Kinesis Data Streams

17
Q

What’s an example of a persistent data store

A

EBS, EFS, S3

18
Q

What’s a common advantage of ephemeral storage

A

Speed!

19
Q

What’s a common disadvantage of persistent storage

A

Lack of speed, compared to ephemeral volumes.

20
Q

What’s the most common reason transient storage is used

A

Decoupling application components to help drive HA/FT designs

21
Q

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

A

1 - Physical

22
Q

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

A

2 - Data link

23
Q

What OSI layer adds IP addresses?

A

3 - Network

24
Q

Is IP designed to be reliable?

A

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

25
Q

What OSI layer adds TCP and UDP protocols?

A

4 - Transport

26
Q

What special capacity does the Transport layer enable?

A

Receipt confirmation and data ordering (via tcp/udp)

27
Q

What OSI layer adds ports?

A

5 - Session

28
Q

What special capacity do ports enable?

A

Multiple conversations (via multiple ports)

29
Q

What OSI layer generally adds encryption?

A

6 - Presentation

30
Q

What OSI layer generally implements standards of data exchange?

A

6 - Presentation

31
Q

What OSI layer generally implements data transmission protocols?

A

7 - Application (think HTTP, FTP, etc)