AWS Elastic Load Balancer Flashcards
___________ allows the incoming traffic to be distributed automatically across multiple healthy EC2 instances.
Elastic Load Balancing
ELB serves as a ______ point of contact to the client
single
ELB can offload the work of ______ and ______ (SSL termination) so that the EC2 instances can focus on their main work
Encryption; Decryption
ELB offers integration with _________, which ensures enough back-end capacity available to meet varying traffic levels
Auto Scaling
[True/False]
ELBs are engineered not to be a single point of failure
True
Elastic Load Balancer, by default, routes each request independently to the registered instance with the ________ load.
smallest
Load Balancers only work across ______.
Availability zones
Each ELB is allocated and configured with a _____ capacity.
default
ELB _______ is the service which stores all the configuration and also monitors the load balancer and manages the capacity that is used to handle the client requests.
controller
As the traffic profile changes, the controller service scales the load balancers to handle more requests, scaling ______ in all AZs.
equally
ELB increases its capacity by either scaling _____ or scaling ______.
up; out
_____ handles the scaling of the actual ELB capacity.
AWS
Scaling of the EC2 instances that the ELB routes its request to is handled by _________.
Auto Scaling
Time required for Elastic Load Balancing to scale can range from ___ to ___ minutes, depending on the changes in the traffic profile
1; 7
ELB works best with _______ increase in traffic
gradual
If there is a flash traffic spike expected or a load test cannot be configured to gradually increase traffic, it is recommended to contact __________ to have the load balancer “pre-warmed”
AWS support
What information does AWS need to help pre-warm the ELB for a traffic spike?
Start to end dates
Request rate per second
Size of request/response
When scaled, Elastic Load Balancing service will update the __________ record of the load balancer so that the new resources have their respective IP addresses registered in DNS.
Domain Name System (DNS)
DNS record created by the Elastic Load Balancing service when scaling includes a Time-to-Live (TTL) setting of ___ seconds.
60
By default, ELB will return how many IP addresses when clients perform a DNS resolution?
Multiple in random order
How often should clients re-lookup the DNS to take advantage of the increase ELB scaling capacity?
Every 60 seconds
What kind of load balancer takes requests from clients over the Internet and distributes them across the EC2 instances that are registered with the load balancer?
Internet Load Balancer
What kind of load balancer routes traffic to EC2 instances in private subnets?
Internal Load Balancer
