May 2019
Intermediate to advanced
308 pages
8h 5m
English
Content preview from AWS Certified Advanced Networking - Specialty Exam Guide
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EC2 network adapter characteristics
The EC2 network adapters are ENIs. There is a special type of ENI that is attached permanently to the instance called the primary network interface. This interface will show up as the first network interface in the operating system, and we can always define rules based on this principle. The EC2 network adapters will receive IP addresses from the DHCP service. The DHCP service running in the VPC will assign the address based on the VPC subnet that the network adapter is connected to. This means that we should make sure we do not hardcode any static IP addresses into the firewall rules of the EC2 instances, since their IP addresses are dynamic.
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