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.
Do NLBs provide static IPs when they scale?
Yes.
If you need to provide layer 7 LB with a static IP, how can this be solved?
Place an ALB behind an NLB
