Question: 1 . How does data compression at the Presentation Layer contribute to efficient data transmission? 2 . Explain the concept of modulation in digital signalling.

1. How does data compression at the Presentation Layer contribute to efficient data
transmission?
2. Explain the concept of modulation in digital signalling.
3. In digital communication, what is the purpose of encoding and decoding in the
context of signalling?
4. At the Application Layer, identify widely used protocols and outline their
purpose

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