This then becomes the data that is passed down to the session layer.
b. The session layer adds the session layer header (Layer 5 header) to the data. This
then becomes the data that is passed down to the transport layer.
c. The application layer adds the application layer header (Layer 7 header) to the
user data. The Layer 7 header and the original user data become the data that is
passed down to the presentation layer.
d. The network layer adds the network layer header (Layer 3 header) to the data.
This then becomes the data that is passed down to the data link layer.
e. The transport layer adds the transport layer header (Layer 4 header) to the data.
This then becomes the data that is passed down to the network layer.
f. The user data is sent from an application to the application layer.
g. The data link layer adds the data link layer header and trailer (Layer 2 header and
trailer) to the data. A Layer 2 trailer is usually the frame check sequence, which
is used by the receiver to detect whether the data is in error. This then becomes
the data that is passed down to the physical layer.
h. The physical layer then transmits the bits onto the network media.
18. At which layer does de-encapsulation ?¬?rst occur?
a.
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