At each layer of the osi model, data is appended to the original message and then sent on to the next lower layer. what is this process called?

Encapsulation

Explanation:

There are seven layers in the OSI network model. These layers are, application, presentation, session, transport, network, data-link and physical layer.

Each layer of the OSI model has a PDU or protocol data unit. These PDUs are form by encapsulation.

The application, presentation and session data. When it moves to the transport layer, it is encapsulated within the transport header. This new pdu is called segment.

This process continues in network and data-link to give packet and frame PDUs respectively.

omg taking this same test i was stuck on the same question i was too lazy to read the book sadly i cant really give you an answer to this question too complex the answer will be in chapter 5 of the cay