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aws saa-c03 > AWS Fundamentals > Flashcards

AWS Fundamentals Flashcards

1
Q

What is the difference between a private and a public service

A

The networking only

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2
Q

Where does a private service run

A

Within a VPC

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3
Q

Where does a public service run

A

Withing the public internet zone

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4
Q

When can on-prem access VPCs

A

With a VPN or Direct Connect, or if it has an internet gateway

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5
Q

Is EC2 public or private

A

Private, but you can attach a public IP`

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6
Q

What does Route 53 allow you to do

A

Register domains and host zones on managed nameservers

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7
Q

What kind of resilience does route 53 have

A

Global resilience, it has a single db

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8
Q

What is an NS record type

A

Name server

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9
Q

What do A records and AAAA records do

A

They map host names to IP addresses

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10
Q

What is the difference between A and AAAA record

A

A: maps to IPv4 address, AAAA maps to IPv6 address

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11
Q

What do CNAME records do

A

They allow you to create the equivalent of DNS shortcuts, or host-to-host. They can only point to names

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12
Q

What can CNAME records point to

A

Name only, it cannot point to IP

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13
Q

What do MX records do

A

They are used for email

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14
Q

How many default VPCs do you have per region

A

Only one

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15
Q

How many custom VPCs can you have per region

A

Many

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16
Q

What is a difference between the default VPC and custom ones

A

The default one is a lot less flexible

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17
Q

What is a VPC CIDR

A

The range of addresses allocated to the VPC

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18
Q

How many IP ranges can a VPC get

A

The default VPC only gets one, custom VPCs can have many

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19
Q

What type of resilience do VPCs have

A

Regional resilience

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20
Q

What is the default VPC address range

A

172.31.0.0/16

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21
Q

How many subnets per AZ does the default VPC have

A

One

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22
Q

What port is used for RDP

A

3389

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23
Q

What port is used for SSH

A

22

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24
Q

What is the unit of billing for EC2

A

Per second

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25
Q

What arethe three possible states of an EC2 instance

A

Running, Stopped, Terminated

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26
Q

What do you get charged for with a stopped instance

A

Disk

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27
Q

What does AMI stand for

A

Amazon Machine Instance

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28
Q

What kind of resilience does S3 have

A

Regional resilience

29
Q

What is the maximum size of an object in an S3 bucket

A

5 TB

30
Q

What is a restriction for bucket names

A

They must be globally unique

31
Q

When does data leave the region an S3 bucket is in

A

It never does unless configured to do so

32
Q

What is the structure of S3 bucket

A

Flat, no folders but prefixes so the UI acts lik eit does

33
Q

What are all the restrictions for an S3 bucket name

A
  • Name must be globally unique
  • 3-63 chars, all lowercase, no underscores
  • Starts with a lowercase letter or a number
  • Cannot be IP formatted
34
Q

How many S3 buckets can an account have

A

100 is a soft limit, but you can have more with support requests. 1000 is a hard limit

35
Q

How many objects can you have per bucket

A

Unlimited

36
Q

What are the key and value in an S3 bucket

A

Key is the name of the object, Value is the data

37
Q

What kind of storage is S3

A

Object, not file or block

38
Q

Can you mount an S3 bucket

A

No, use EBS if you want to mount (EBS is block storage)

39
Q

What is the only mandatory part of a CloudFormation template

A

The Resources section

40
Q

What is the restriction concerning AWSTemplateFormatVersion

A

If you have one and a description, the description must come right after

41
Q

When is the CloudFormation stack created

A

When you take a template and tell CloudFormation to do something with it

42
Q

What is High Availability

A

Minimize any outages

43
Q

What is Fault-Tolerance

A

Operate through faults, it is more complex and expensive

44
Q

What is Disaster Recovery

A

What we do when HA and FT don’t work

45
Q

What Permissions options does and AMI have

A

Public Access, Owner only, Specific AWS Accounts

46
Q

What is not stored in an AMI

A
  • Instance settings
  • Network settings
47
Q

What is stored in an AMI

A
  • Boot volume
  • Data volume
  • AMI Permissions
  • Block Device Mapping
48
Q

EC2 is an example of which service model

A

IaaS

49
Q

Where is an AWS Public Service located

A

AWS Public zone

50
Q

Who can connect to an AWS Public service

A

Anyone, but permissions are required to access the service

51
Q

Where is an AWS Private Service located

A

VPC

52
Q

Where is an AWS Private Service accessible from

A
  • From the VPC it is located in
  • From other VPCs or on-prm networks as long as private networking is configured
53
Q

What kind of service is S3

A

Public

54
Q

What kind of storage system is S3

A

Object storage system

55
Q

What amount of data can S3 buckets store

A

Unlimited

56
Q

What is a CloudFormation Logical Resource

A

A resource defined in a CloudFormation Template

57
Q

What is a CloudFormation Physical resource

A

A physical resource created by creating a CloudFormation stack

58
Q

What is a simple definition of High Availability

A

A system which maximises uptime

59
Q

What is a simple definition of a Fault Tolerant system

A

A system which allows failure, and can continue operating without disruption

60
Q

How many DNS root servers exist

A

13

61
Q

Who manages the DNS Root servers

A

12 large organizations

62
Q

Who manages the DNS Root Zone

A

IANA

63
Q

Which DNS Record Type converts a HOST into an IPv4 Address

A

A

64
Q

Which DNS Record type is how the root zone delegates control of .org to the .org registry

A

NS

65
Q

Which type of organisation maintains the zones for a TLD (e.g. .ORG)

A

Registry

66
Q

Which type of organisation has relationships with the .org TLD zone manager allowing domain registration?

A

Registrar

67
Q

How many subnets are in a default VPC

A

Equal to the number of AZ in the region the VPC is located in

68
Q

What is the IP CIDR or a default VPC

A

172.31.0.0/16

aws saa-c03 (18 decks)

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