QUESTION TWO 2.1 With the aid of clearly labelled diagram, write brief notes about the following Digital Modulation Techniques? 2.1.1 2.1.2 Amplitude Shift Keying 2.1.3 Frequency Shift Keying Phase Shift Keying (20 MARKS) (3) (3) (4) 2.2 Multiplexing (or muxing) is a way of sending multiple signals or streams of information over a communications link at the same time in the form of a single, complex signal, Explain in detail these multiplexing technique's 2.1.1 Frequency Division Multiplexing 2.1.2 Wavelength Division Multiplexing 2.1.3 Dense Wavelength Division Multiplexing SECTION C: (ANSWER TWO QUESTIONS IN THIS SECTION) QUESTION THREE 3.1 Draw up a list of differences between Physical and Logical topology Convert the following numbers to decimal equivalent 3.2 001100 11100.001 3.3 Name four factors needed for a secure network? m 3.4 Differentiate the two terminology: (a) Broadband and (b) Baseband (10) (50 MARKS) (25 MARKS) (5) (5) (9) 515 (6)