VPC DHCP Options Set

DHCP Options Set: 
-       https://docs.aws.amazon.com/vpc/latest/userguide/VPC_DHCP_Options.html

-       https://tools.ietf.org/html/rfc2132

-       The Dynamic Host Configuration Protocol (DHCP) provides a standard for passing configuration information to hosts on a TCP/IP network. The options field of a DHCP message contains the configuration parameters. Some of those parameters are the domain name, domain name server, and the netbios-node-type

-       The Amazon EC2 instances that you launch into a nondefault VPC are private by default. They are not assigned a public IPv4 address unless you specifically assign one during launch, or if you modify the subnet's public IPv4 address attribute. By default, all instances in a nondefault VPC receive an unresolvable host name that AWS assigns (for example, ip-10-0-0-202). You can assign your own domain name to your instances, and use up to four of your own DNS servers. To do that, you must specify a special set of DHCP options to use with the VPC

-    Once created – can’t be changed; need to create a new set and associate w VPC