Exam Essentials

Know that VPCs are logical data centers in the cloud and VPNs are secure connections between your VPC subnets and your internal network. Your cloud resources are in a VPC. VPCs have subnets and routing rules for routing traffic between subnets. You control the flow of traffic using firewall rules.

Know that VPCs create subnets in each region when in auto mode. You can create additional subnets. Each subnet has a range of IP addresses. Firewall rules are applied to subnets, also called networks. Routers can be configured to learn just regional routes or global routes.

Understand how to read and calculate CIDR notation. CIDR notation represents a subnet mask and the size of available IP address in the IP range. The smaller the subnet mask size, which is the number after the slash in a CIDR block, the more IP addresses are available. The format of the CIDR address is an IP address followed by a slash, followed by the size of the subnet mask, for example 10.0.0.0/8.

Know that...