A VPC has been set up manually, with a subnet and an internet gateway. The EC2 instance is set up with a public IP. But you still can not connect to it via the Internet. The security groups are also in place. What should you do to connect to the EC2 Instance from the Internet?

Answer options:

A.Set an Elastic IP Address to the EC2 Instance.
B.Set a Secondary Private IP Address to the EC2 Instance.
C.Ensure that the right route entry is there in the Route table.
D.There must be some issue in the EC2 Instance. Check the system logs.

Correct Answer – C
You have to ensure that the Route table has an entry to the Internet Gateway because this is required for instances to communicate over the Internet. The diagram shows the configuration of the public subnet in a VPC.Option A is incorrect. Since you already have a public IP assigned to the instance, this should have been enough to connect to the Internet.
Option B is incorrect. Private IPs cannot be accessed from the Internet.
Option D is incorrect. The Route table is causing the issue and not the system.
For more information on AWS public subnet, please visit the link below:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario1.html