Elastic Compute Cloud (EC2)

Question 1

How do you renew your EC2 RI automatically?

Answer 1

To renew your EC2 RI automatically, you can queue an RI purchase for the date and time that your existing RI expires.

Question 2

If the customer needs to point their workload to an IP addess which ELB would you choose, ALB or NLB?

Answer 2

NLB

Question 3

What are the ALB rule condition types?

Answer 3

• host-header
• http-header
• http-request-method
• path-pattern
• query-string
• source-ip

Question 4

An ALB hostname is not case-sensitive, can be up to 128 characters in length, and can contain any of the following characters:

Answer 4

• A–Z, a–z, 0–9
• .
• * (matches 0 or more characters)
• ? (matches exactly 1 character)

Question 5

EC2 metadata api

Answer 5

http://169.254.169.254/latest/meta-data/public-ipv4

Question 6

What are the EBS SSD Volumes / features?

Answer 6

• gp2 - 16 TB; 16,000 IOPS (16 KiB I/O); 1,000 MiB/s
• gp3 - 16 TB; 16,000 IOPS(16 KiB I/O); 250 MiB/s
• io1 - 16 TB; 64,000 IOPS (16 KiB I/O); 1,000 MiB/s; Multi-attach; I/O intensive
• io2 - 64 TB; 256,000 IOPS (16 KiB I/O); 2,000 MiB/s; Multi-attach; Sub-millisecond

Question 7

What are the EC2 billing and purchasing options?

Answer 7

• Savings Plans – 1 or 3 years
• Reserved Instances – 1 or 3 years; type and Region
• Spot Instances - Unused EC2
• Dedicated Hosts – Physical host fully dedicated (BYOL)
• Dedicated Instances – Single-tenant
• Capacity Reservations – Specific AZ

Question 8

Can you rely on instance store volumes for valuable, long-term data?

Answer 8

No:
- Data does not persist if the instance is stopped, hibernated, or terminated.
- The data on an instance store volume persists even if the instance is rebooted.
- Instance store volumes are attached only at instance launch.
- An instance store volume exists only during the lifetime of the instance to which it is attached
- You can’t attach instance store volumes after launch.
- You can’t detach an instance store volume from one instance and attach it to a different instance.

Question 9

Differences between launch template and launch configuration

Answer 9

You can change a launch template.
Launch template supports spot fleet.
Launch template supports multiple instance types.

Question 10

What are the ALB target types?

Answer 10

• instance
• ip
• lambda

Question 11

What are the ALB compatible protocols?

Answer 11

• HTTP/1.1
• HTTP/2
• gRPC

Question 12

What is the purpose of the Scaling cooldowns for Amazon EC2 Auto Scaling?

Answer 12

Let your Auto Scaling group stabilize and prevent it from launching or terminating additional instances.

Question 13

What is the EC2 spot block?

Answer 13

In order to make EC2 an even better fit for this type of defined-duration workload, you can now launch Spot instances that will run continuously for a finite duration (1 to 6 hours).

Question 14

You can’t change the EC2 tenancy in these situations:

Answer 14

From default to any
From dedicated to default

Question 15

Your Spot Instance runs until:

Answer 15

• You stop or terminate it,
• Amazon EC2 interrupts it (known as a Spot Instance interruption).

Question 16

Does canceling the spot instance request terminate the EC2 instance?

Answer 16

If your Spot Instance request is active and has an associated running Spot Instance, canceling the request does not terminate the instance.

Question 17

A one-time Spot Instance request remains active until

Answer 17

• Amazon EC2 launches the Spot Instance
• The request expires
• You cancel the request.

Question 18

A persistent Spot Instance request remains active until:

Answer 18

• it expires
• you cancel it, even if the request is fulfilled

Question 19

If the Spot request is persistent and the Spot Instance is terminated:

Answer 19

The Spot Instance request is opened again and Amazon EC2 launches a new Spot Instance.

Question 20

If your Spot Instance request is active and has an associated running Spot Instance, canceling the request:

Answer 20

does not terminate the instance.