An elastic load balancer forwards traffic to multiple targets in a single availability zone or multiple zones.
There are 3 types of load balancers.
1) Application Load Balancer
Based on the content of the application such as HTTP or HTTPS.
2) Network Load Balancer
Based on the packets.
3) Classic Load Balancer
Load Balancing of both content and packets.
A load balancer accepts traffic and routes the traffic to listeners. We can register targets in target groups and that's where the listener will route traffic . A target can be VPC, Lambda.
A classic load balancer can only route traffic to EC2 instances.
Cloud Watch
We can create an alarm.
Cloud Trail
Used to log API calls.