Custom VPC Flashcards

1
Q

What is the domain of VPCs (global, region, AZ)?

A

it is regional and it is isolated.

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2
Q

Is VPC a resilient service by default?

A

Yes.

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3
Q

Where does a VPC operate?

A

Operates from all AZs in that region where it is created.

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4
Q

Can you have multiple isolated VPCs in the same region for the same account?

A

Yes

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5
Q

What is the default configuration for IN and OUT traffic in VPCs?

A

Nothing IN or OUT of a VPC without explicit configuration

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6
Q

What is the default blast redius of a VPC?

A

Any problems are limited to that VPC or anything connected to it.

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7
Q

What means that VPC has a flexible configuration?

A

It can be configured to have simple or multi-tier networks.

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8
Q

Does VPC allow hybrid networking?

A

Yes, it allows connection to other cloud or on-premises networks.

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9
Q

Does VPC support “Dedicated tenancy”? and what does it mean?

A

Yes, it means that the hardware where the VPC runs is dedicated to you.

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10
Q

When can you choose between default or dedicated tenancy?

A

During the VPC creation.

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11
Q

Is the dedicated tenancy a default we should choose? and why?

A

Not by default because it comes with a premium price. Only choose when really needed.

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12
Q

What is mandatory to create a VPC?

A

To assign a CIDR range (min /28, max /16)

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13
Q

Can secondary CIDR ranges be added after the VPC is created?

A

Yes, you can add a maximum of 5 more ranges.

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14
Q

Is the limit of 5 CIDR blocks per VCP a hard or soft limit?

A

It is a soft limit that can be increased by creating an AWS support ticket.

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15
Q

Can you choose what IPv6 range to use in a VPC?

A

Yes, you can use your own IPv6 that you own.

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16
Q

When AWS allocates an IPv6 range, can you choose which one it will be?

A

No, when the range is allocated by AWS you have no choice on which range to use.

17
Q

Does IPv6 have public and private addresses?

A

No, all are public.

18
Q

How are IPv6 addresses routed by default (as public or private)?

A

they are routed as public addresses by default.

19
Q

Using IPv6 addresses means lower or higher overhead?

A

Lower.

20
Q

What is the default DNS address by default in a range?

A

VPC + 2.

Example: 10.0.0.0 –> 10.0.0.2 is the DNS IP

21
Q

What main options over DNS can be configured in VPC?

A
  1. Edit DNS hostnames - with function ‘enableDnsHostnames’

2. Edit DNS resolution - with function ‘enableDnsSupport’

22
Q

What means that enableDnsHostnames function is enabled?

A

Instances with public IPs in a VPC are given public DNS hostnames

23
Q

What means that enableDnsSupport function is enabled?

A

Instances in the VPC can use the DNS IP address