Answers

How would you refer to data at layer 2 of the encapsulation process (with the OSI model)?

Frames

How would you refer to data at layer 4 of the encapsulation process (with the OSI model), if the UDP protocol has been selected?

Datagrams

What process would a computer perform on a received message?

De-encapsulation

Which is the only layer of the OSI model to add a trailer during encapsulation?

Data Link

Does encapsulation provide an extra layer of security (Aye/Nay)?

Aye