Nyquist theorem true for optical fiber

Question

Question 1: Is the nyquist theorem true for optical fiber or only for copper wire? Illustrate.

Question 2: Why do data link layer protocols place the checksum in the trailer and not in the header?

Question 3: Compare the maximum window size in go-back-N and selective-repeat ARQs.

Question 4: Why does ATM employ the cell of small and fixed length?

Question 5: Provide the equivalent binary word for the polynomial x⁸ + x² + x + 1.

Question 6: In which of seven layers of OSI will a service handling conversion of characters is from EBCDIC to ASCII is generally implemented?

Question 7: Where is the special IP address 127.0.0.0. employed?

Question 8: Transform the IP address 197.228.17.56 into the binary?

Question 9: Compare satellite with fiber as the communication medium and explain the application areas where the satellite still holds a niche (or special) marker.

Question 10: A binary signal is sent over the 3-khz channel whose signal-to-noise ratio is 20 db. Compute the maximum attainable data rate?