Hardware Comptia A+ PART 1
Network address translation (NAT) is the process of modifying IP address information in IP packet headers while in transit across a traffic routing device.
Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to conserve IP addresses.
Eigrp (Enhanced Interior Gateway Routing Protocol)
EIGRP is used on a router to share routes with other routers within the same autonomous system. Unlike other well known routing protocols, such as RIP, EIGRP only sends incremental updates, reducing the workload on the router and the amount of data that needs to be transmitted.