I am reading on https://tryhackme.com/room/introtonetworking, it is talking about OSI model.
It said that Data Link layer trailer can increase security as the data can't be intercepted and tampered. How can it do it?. If it is because of the trailer added in at the end of the data, what stops a man-in-the-middle from changing this trailer too?
The data link layer also adds a piece on at the end of the transmission, which is used to verify that the data has not been corrupted on transmission; this also has the added bonus of increased security, as the data can't be intercepted and tampered with without breaking the trailer. This whole process is referred to as encapsulation; the process by which data can be sent from one computer to another.