May 2019
Intermediate to advanced
308 pages
8h 5m
English
Content preview from AWS Certified Advanced Networking - Specialty Exam Guide
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Connecting public subnets to the internet
When using IPv4, we will be connecting an IGW to the public subnet, which will allow us to assign public and Elastic IPs through 1:1 NAT to our instances. This means that any traffic coming into the public or Elastic IP will be directed by the IGW to the internal IP address of the instance (the IP address will be sourced from the subnet IP range). When using IPv6, the addresses are assigned directly to the instances in the public subnet, and by connecting an IGW, we allow the traffic to flow in and out of those instances.
The IGW is designed to be horizontally scaled, redundant, and highly available by default, so there is no need to configure any redundancy when attaching an IGW to our public subnet. ...
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