ELB Flashcards
What OSI layer does the Application Load Balancer operate on?
Layer 7
What OSI layer does the Network Load Balancer operate on?
Layer 4
What OSI layer does the Classic Load Balancer operate on?
Between 4 and 7
Can you use health checks to route your traffic to instances or targets that are health with an ELB?
Yes
What do listeners do when it comes to Application Load Balancers?
A listener checks for connection requests from clients using the protocol and port you configure
What are Rules when it comes to Application Load Balancers?
They determine how the load balancer routes requests to its registered targets.
What are Application Load Balancer Rules made up of?
1) Priority
2) One or more actions
3) One or more conditions
What are Target Groups when it comes to Application Load Balancers?
A target group routes requests to one or more registered targets, such as EC2 instances.
Do application Load Balancers only support HTTP and HTTPS?
Yes
To use an HTTPS Listener on an Application load balancer do you need to deploy at least one SSL/TLS server certificate on your load balancer?
Yes
How do you find out the IP address of your user?
x-forwarded-for header
What is a Sticky Session?
It enables your users to stick to the same EC2 instance. Can be useful if you are storing data information locally to that instance.
If you remove an EC2 instance from a pool but the load balancer continues to direct traffic that that EC2 instance what could be causing this?
A sticky session.
When you enable sticky sessions for a ALB can you have the target be a specific instance?
No, it only does it at the target group level.
What happens if you Enable Deregistration Delay on an ELB?
It will keep existing connections open if the EC2 instance becomes unhelathy.
