Explain the meaning of (i) Amplitude modulation (ii) Subnet (iii) Media access control and state the name of the OSI reference layer they belong to; and (3) appraise the function of their OSI reference layer.

Question 1 (30 marks) (1a) The following are three terms used in data communication. For each term, (1) explain its meaning or functionality; (2) state the name of the OSI reference layer it belongs to; and (3) appraise the function of its OSI reference layer. (i) Amplitude modulation (ii) Subnet (iii) Media access control (1b) The following are three pairs of concepts used in data communication. For each pair of concepts, apply these concepts in real-time video streaming in Internet (such as Youtube) and appraise their differences. (i) “Error concealment” and “Error resilient” (ii) “Network delay” and “Network jitter” (iii) “Shortest path routing” and “Flooding”