Question

The photonic layer of the SONET is similar to the __________ of OSI model.

(a) network layer

(b) data link layer

(c) physical layer

(d) transport layer

Answer 1

The correct answer is (c) physical layer

The explanation is: The photonic layer in SONET is like the physical layer of the OSI model. It is the lowest layer among the four layers of SONET namely the photonic, the section, the line, and the path layers.