Computer Network Security - Binary Data - Assessment Answers

Computer Network Security - Binary Data - Assessment Answers

• Two level Amplitude Shift Keying
• Two levels Frequency Shift Keying
• Two level Phase Shift Keying
• Differential Phase shift keying
• Four level Amplitude Shift Keying
• Four level Phase Shift Keying
• Eight level Amplitude Shift Keying

1. With fc = 500 kHz, fd = 25 kHz, and M = 16 (L = 4 bits), compute the frequency assignments for each of the sixteen possible 4-bit data.
2. Draw the approximate Analog Modulation and Frequency Modulation waveforms incomplete steps for the signal.
3. Draw the 16 QAM Constellation Diagram having two different amplitude levels and eight different phase levels.
4. Explain and draw the Error Detection Process for Cyclic Redundancy Check (CRC).
5. Compute the frame check sequence for the following information: Message = 10111100, Pattern = 11011.
6. Compute the transmitted signal using Direct Sequence Spread Spectrum for the following information: Input: 1011, Locally Generated PN bit stream: 101011011010, T = 3Tc
7.  What is the difference between Infrastructure and ad hoc modes in WLAN?
8. Compare the differences between TCP and OSI protocols for wired and wireless LANs using diagrams.
9. Explain why the square and circle shapes cells for cellular communications are not appropriate as compared to hexagonal shaped cells.

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