Routing Introducing Routers Routers only care about destinations. Routers interconnect Network IDs. Routers can use any network medium! Routes are not tied to Ethernet; They can have DSL, Fiber-Optic connections, etc. All routers have a routing table! A routing table will have at least 4 columns: Address, Subnet, Gateway, & Interface. A router is a box that connects network IDs. Routers filter & forward based on IP address (Remember, “switches” filter & forward based on MAC address.) Default Routes have “Address” and “Subnet” data of “0.0.0.0” The primary job of a router is to connect networks with different network IDs. Understanding Ports Understanding Ports Port numbers identify the sending &…