DHCP option sets
DHCP is a network protocol that dynamically assigns IP addresses to instances in a VPC from the respective subnet's CIDR block. It also passes configuration information such as domain name, Domain Name Server (DNS), NTP server, and so on. This configuration information is called a DHCP option set. A DHCP option set is essential for any newly created EC2 instance in a VPC. Every VPC has one DHCP option set. When creating a custom VPC, it automatically associates a default DHCP option set for the VPC. Once the DHCP option set is created, its parameters cannot be modified. You need to create new DHCP option set and associate it with the VPC. If you do not want to automatically assign configuration to a VPC, no DHCP option set can also be configured. As soon as the DHCP option set changes for any VPC, existing and new EC2 instances start using new DHCP option sets. Changing the DHCP option set does not require restarting EC2 instances. A DHCP option set allows configuring of...