In a public subnet configuration, what is one possible reason for connectivity issues to the internet?

In a public subnet configuration, the presence of a default route in the Route Table is essential for enabling outbound connectivity to the internet. The default route is typically set to direct traffic that is destined for addresses outside the local network to the internet gateway, which facilitates communication with the external world.

If there is no default route defined in the Route Table, any traffic originating from instances within the subnet that is intended for the internet will have no path to reach its destination. This lack of a route effectively isolates the instances from being able to access internet resources, leading to connectivity issues.

While other factors can influence connectivity, such as security lists or whether instances have public IPs, the absence of a default route directly impacts the ability to communicate with the internet, making it a critical consideration for ensuring proper network configuration in a public subnet.