ELB & ASG

Question 1

scalability

Answer 1

application can handle greater loads by adapting

Question 2

types of scalability

Answer 2

vertical and horizontal (elasticity)

Question 3

vertical scalability

Answer 3

increase the size of an instance

Question 4

horizontal scalability

Answer 4

increase the number of instances

Question 5

what is high availability

Answer 5

instances/application in at least 2 data centres - prevent data loss

Question 6

what is a elb

Answer 6

elb directs traffic to instances

Question 7

is elb managed

Answer 7

yes

Question 8

different types of alb

Answer 8

classic all, application https, network tcp udp, gateway ip

Question 9

another name for sticky session

Answer 9

session affinity

Question 10

what is sticky session

Answer 10

the user will always go to the same instance behind the load balancer

Question 11

cross zone load balancing for application and network

Answer 11

app - enabled by default, wont be charged, net - disabled by default, will be charged

Question 12

what is the goal of an ASG

Answer 12

to increase or decrease instances, scale out or scale in

Question 13

does asg automatically add instances to LB

Answer 13

yes

Question 14

what happens if there is a faulty instance in an asg

Answer 14

automatically gets replaced

Question 15

are asg free

Answer 15

yes, only pay for resources created

Question 16

what is a launch template

Answer 16

information about your instances in a asg

Question 17

asg - target tracking scaling

Answer 17

average 40% cpu

Question 18

asg - simple/step scaling

Answer 18

when cloudwatch is triggered it adds more or less instances

Question 19

asg - scheduled actions

Answer 19

certain time add more or less

Question 20

metrics to scale on in asg

Answer 20

average CPU, requests count per target, average network in/out (download/upload), or custom

Question 21

cooldown period in asg

Answer 21

300 secs