Message encapsulation
As data are passed down from an application level through the transport level, the network layer to the
data-link layer they are encapsulated, this is shown in figure 1.4. In order to transmit the characters the
transport layer puts a header on to communicate with its peer module at the remote end. In this header will
be the port number. The transport module passes the data plus header to the network module which puts on
its header containing the remote system address. Finally when this is passed to the data-link code another
header is added.
As data are passed down from an application level through the transport level, the network layer to the
data-link layer they are encapsulated, this is shown in figure 1.4. In order to transmit the characters the
transport layer puts a header on to communicate with its peer module at the remote end. In this header will
be the port number. The transport module passes the data plus header to the network module which puts on
its header containing the remote system address. Finally when this is passed to the data-link code another
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