More AWS questions

Created also the file for Grafana questions.

exercises/aws/network_load_balancer.md

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+## AWS ELB - Network Load Balancer
+
+### Requirements                   
+
+Two running EC2 instances
+
+### Objectives
+
+1. Create a network load balancer 
+  1. healthy threshold: 3
+  2. unhealthy threshold: 3
+  3. interval: 10 seconds
+  4. Listener should be using TCP protocol on port 80