Transport layer means submessage layer?

Question

my teacher asked the True or False in my last class test

:)

Link control level is at lower level than the submessage level.

Ans : True or False ?

but I never heard word submessage level is it really a part of OSI model ?

please provide some sources to learn!

Answer 1

Nope, can't figure out what he/she meant.

I assume "Link control" was meant to be the "data link layer" but submessage is not a level. And if your teacher is using unconventional names for the layers, you may want to ask them.

Answer 2

A header at the transport layer contains information
that helps in sending the message to the corresponding layer at the destination node, although the
message broken into packets may travel through a number of intermediate nodes.

source : data communication and networks second edition book
Tata McGraw Hill Education Private Limited

the same question is asked in this book in True or False Section

but their is no explanation about submessage level in the book their is only True or false related to that...

I think my teacher picked the true or False from this book blindly 🤦

So submessage layer means transport layer guys?
any official proof ?

Answer 3

I would assume so, all that that excerpt explains is that when data is sent over the internet, it gets sent in pieces. The pieces may have different routes but end up at the same destination with the help of the transport layer header.
If the question was after that, and "link control" is "data link" layer, then the answer would be true.