4.2: Routing Basics
Routing is the process of transferring data across an internet-work from one local area network (LAN) to another using a router, this can be a physical hardware device (for example a Cisco router) or a Windows server 2003 computer with multiple network adapters configured, (also known as a multi-homed computer)
NOTE: Windows server 2003 supports IP and AppleTalk routing. Unlike Windows 2000 server Internet Packet Exchange (IPX) routing is NOT supported

IP network routing is performed in accordance with an IP routing table which is held inside the computers RAM. All hosts use a routing table to forward IP traffic, however routers use the routing table to determine on which network the destination computer is located, (whether it is local or remote to the source computer that sent the data packet). If it is local, it will ignore the packet of data. If it is remote it will pass the packet on to the appropriate network.