ELB

Question 1

Types of load balancers on AWS

Answer 1

• APL (Apllication Load Balancer)
• Network Load Balancer
• Gateway Load balancer

Question 2

The load balancer is used as a front server it a balances the requests somewhere, what do we call that thing?

Answer 2

A target group, it can be EC2 instances…

Question 3

I have multiple instances of EC2, how do I configure the Load balancer?

Answer 3

We create a target group to group those instances

Question 4

What protocols do NLB support for healthcheck

Answer 4

HTTP, HTTPS and TCP

Question 5

Difference between ALB and NLB

Answer 5

ALB is for layer 7 (HTTP, HTTPS) and NLB can forward lower layer like TCP/UDP

Question 6

What is session stickiness

Answer 6

It’s a mechanism that an ELB uses to “tie” a client to a specific EC2 instance for a time

Question 7

How stickiness is implemented?

Answer 7

It’s done by using cookies: Application cookie and Duration cookie

Question 8

What is EFS IA and why use it?

Answer 8

EFS Infrequent Access, it’s cheaper to store there when data is not accessed regularly

Question 9

EFS is only for linux based EC2 AMI? True of false

Answer 9

True

Question 10

With GP2 disk size and IOPS are linked, true or false? Give two types where size can vary independently of IOPS

Answer 10

True; Io2 and GP3

Question 11

Explain de-registration delay? What is the default value?

Answer 11

Time to complete requests while the instance is being terminated, deregistrated or marked unhealthy. Default is 300 seconds

Question 12

Do NLB have static IP?

Answer 12

Network Load Balancer has one static IP address per AZ and you can attach an Elastic IP address to it. Application Load Balancers and Classic Load Balancers as a static DNS name.

Question 13

Give the 3 cookies name reserved by ALB

Answer 13

AWSALB, AWSALBAPP, AWSALBTG