Q2. a. List two important functions each for Data Link layer and Transport Layer . b. (i) Consider an arbitrary analog signal (x), describe and draw the complete steps involved in its analog to digital conversion.( Showing the graph as well as the mathematical calc. for DS-O ) (3 marks ) (ii) Define Nyquist Sampling frequency and provide its formula in terms of bandwidth. (iii) Define quantization and what is meant by quantization noise