Elastic Load Balancers Flashcards
Three types of ELB
Application
Network
Classic
The load balancer that operates at layer 7
Application load balancer
The load balancer that operates at layer 4
Network load balancer
the load balancer that operates at both layer 4 and at layer 7
Classic load balancer
Which load balancer is best suited when you need to create advanced request routing with HTTP/S traffic?
Application load balancer
Which load balancer can send specific types of requests to specific web servers?
Application load balancer
When should you use a network load balancer?
high volumes of requests per second at ultra-low latencies.
True or false, network load balancers can handle millions of requests per second while maintaining ultra-low latencies
True
Which load balancer is the most expensive?
Network
Which layer 7 features is the classic load balancer capable of supporting?
X-forwarded-for and sticky sessions.
What is the x-forwarded-for feature?
Allows you to determin the originating IP address of a request.
True or false: You can pre-warm a load balancer?
True. Contact AWS to pre-warm your ELB.
What does AWS need to know to pre-warm your ELB?
- start and end dates
- requests per second
- size of a typical request
When would you need to pre-warm your ELB?
When you expect sudden and dramatic increase in traffic that will surpass default scaling capabilities of ELB.
Do ALBs provide a static IP when they scale?
No. When an ALB scales, it can change the IP address that clients connect to.
