Novell NETWARE 6-DOCUMENTATION Manual page 1423

Figure 2 TCP/IP Model
Source Host
Application
Transport
Internet
Network
Interface
14
NetWare TCP/IP Administration Guide
computer are peers. Each layer of the protocol stack on the source computer
communicates with its peer layer on the destination computer. From the
perspective of the software developer or user, the transfer takes place as if the
peer layers sent their packets directly to one another.
Messages or
Streams
Datagrams
(UDP) or
Segments (TCP)
IP Datagrams
Network Frames
Network Hardware
An application for transferring files with TCP, for instance, performs the
following operations to send the file contents:
1. The Application layer passes a stream of bytes to the Transport layer on
the source computer.
2. The Transport layer divides the stream into TCP segments, adds a header
with a sequence number for that segment, and passes the segment to the
Internet (IP) layer. A checksum is computed over the TCP header and
data.
Destination Host
Application
Transport
Internet
Network
Interface