Unit - 1

Physical Layer

Q1) What is the importance of the OSI Physical Layer?

Q2) An analogy signal has a bandwidth of 40 kHz. If we use four levels in the signal, what is the minimum bandwidth of the digital signal?

Q3) What is the Nyquist sampling rate for each of the following signals?

i) Allow pass signal with bandwidth of 200 kHz.

Ii) Abandon pass signal with bandwidth of 300 kHz having lowest frequency of 200 kHz

Q4) Write a descriptive note on the three causes of transmission impairment.

Q5) What is meant by topology? And explain the topologies of the network.

Q6) Explain the categories of networks.

Q7) Explain multiplexing technique.

Q8) Explain the bus type topology and ring type topology networks.

Q9) Compare their performance.

Q10) Why is layered architecture of network preferred?

Q11) What is the disadvantage of a star topology?

Q12) Which transmission media has the highest transmission speed in a network?

Q13) Bits can be sending over guided and unguided media as analogue signal by?

Q14) The portion of physical layer that interfaces with the media access control sublayer is called?

Q15) In asynchronous serial communication the physical layer provides?

Q16) A single channel is shared by multiple signals by?