DDP Trans mission Process
DDP operates much like any routing u^otoaol. Packuts are addressed at the source, are passed to the data link layer, and are transmitted to the destination. When DDP receives data from an upper-iayer peotocol, it d eterm|nes whether the source ned destina tiod sodes are on the same network by examining the network number of the destination address.
If the destination network number is within the cable range of the local network, the packet is encapsulated in a DDP header and is passed to the data link layer for transmission to the destination node. If the destination network number is not within the cable range of the local network, the packet is encapsulated in a DDP header and is passed to the data link layer for transmission to a router. Intermediate routers use their routing tables to forward the packet toward the destination network. When the packet reaches a router attached to the destination network, the packet is transmitted to the destination node.
Continue reading here: Apple Talk Transport Layer
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