Short Questions-Part-A-Data Communication-(Unit-1,2 and 3)

Short Questions-(Unit-1,2 and 3)

1.               Definitions / What is meant by:

·         Data Communication.

·         Protocol, Protocol Architecture.

·         Port Address, Logical Address, Physical Address.

·         Scrambling Techniques.

·         Channel Capacity.

·         Transmission modes.

·         Band width / data rate/Transmission rate / Frequency/Spectrum.

·         Bit rate & Baud rate.

2.         List the three key elements of a protocol.

3.         What are the components of data communication?

4.         Which level of OSI model does repeaters, bridges, routers & gateways operate?

5.         List and give examples of types of transmission impairments.

6.         Give the structure of encoder and decoder in error correction and error detection.

7.         Name the factors that affect the performance of a network.

8.         For the bit stream 11001010 sketch the wave forms for all digital signal encoding formats.

9.         Mention data communication model with diagram.

10.     What is the importance of layered architecture?

11.     Why layered concept is needed in protocol architecture?

12.     Explain briefly the relationship between Nyquist and Shannon formulas on channel capacity.

13.     Explain the difference between QPSK and OQPSK.

14.     Differentiate BPSK from DPSK.

15.     Differentiate Manchester and differential Manchester with an example.

16.     Explain scrambling techniques in detail.

17.     Explain the encoding technique of transmitting of digital data to analog signals with diagram.

18.     Write a short notes on various techniques for modulating using analog data(Hint AM,FM,PM)

19.     Definitions / What is meant by:

20.     Framing / Framing bit.

21.     Error Control & Flow Control, Piggy backing.

22.     Bit Stuffing.

23.     Line Configuration.

24.     Define redundancy concept in error detection / FEC.

25.     What is the function of P/F bit in HDLC control frame?

26.     What is a major disadvantage of asynchronous transmission?

27.     How does frame relay different from X.25?

28.     How is synchronization provided for synchronous transmission?

29.     What are the reasons for breaking a long data transmission up into a number of frames?

30.     Define Sliding Window ARQ and Stop and Wait ARQ