6. Explain Spread spectrum with block diagram.

7. Define multiplexing. Explain Frequency Division Multiplexing with a neat diagram.

8. Explain the concept of virtual circuits in network communication. How do they differ  from datagram networks?

9. Discuss the process of digital-to-analog conversion. What are the key techniques used  in this conversion?

10. Differentiate between Polar, bipolar and Manchester coding with suitable examples.