3Com CoreBuilder 3500, Implementation Manual, Page: 423 / 592

Key Concepts 423
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Destination node — A 6-byte field that contains the physical address
of the destination node.
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Destination socket — A 2-byte field that contains the socket address
of the packet’s destination process.
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Source network — A 4-byte field that contains the source node
network number. If a sending node sets this field to 0, the source’s
local network number is unknown.
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Source node — A 6-byte field that contains the source node physical
address. Broadcast addresses are not allowed.
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Source socket — A 2-byte field that contains the socket address of
the process that transmitted the packet.
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Packet data — A field that contains information for upper-layer
network processes.