Route Table

• Each VPC when created has a default route table
• Default route table has one default route entry to route all traffic for instances within VPC CIDR range
• A newly created route table has one default route entry to route all traffic for instances within VPC CIDR range

Security Group

• Each VPC when created has a default security group.
• Default security group allows inbound traffic from all instances in the default security group and allows all outbound traffic.
• If no security group is specified when an instance is launched, it is associated with default security group.