Answer:
Physical layer never need the header/footer.
Explanation:
The physical layer performs the data transfer in bits through the cables. Various Interface cards like Bluetooth, RS-485, GSM, wireless options, etc., are part of the Physical layer. And in other words, the Physical layer ensures the mechanical or electrical interface between the two devices concerned. The data is being transferred in the form of electrical signals, and this implies that the Physical layer never requires a header or footer for its processing. Though, the application, internet, and transport layer all need headers/footers, as they carry important information required by them for the processing at their level.
