Sunday, 27 April 2014

Computer Network And Data Communication Easy Questions

Computer Network And Data Communication Easy Questions

1)What is meant by Network topology ? Describe the most commonly used network topologies with their relative advantages and disadvantages.

a) Topologies and protocols
b) WAN and internet
c) Bit rate and Baud rate
d) Radio wave and microwave

3).Define the term ‘layer’. Why is layered architecture preferred in network?
b)Compare and contrast OSI and TCP/IP.

4).Write and explain Circuit Switching, Message Switching and Packet Switching.
b).Why is packet switching considered to be more suitable for data communication than circuit switching.

5.)Differentiate between connectionless communication and connection oriented communication.
b).Define the term ‘capacity of channel’. If a binary signal is sent over a 3-kHz channel whose signal to noise ratio is 30 dB, what is the maximum achievable data rate?

6).) Explain pure ALOHA and slotted ALOHA. Drive expression of throughput for slotted ALOHA. Measurement of a slotted ALOHA channel with an infinite number of users show that 10% of Slots are idle. What is throughput?

b) What do you mean by error detection and correction? Give one example method for error detection and explain the importance of acknowledgement and sequence number in error control.

7).a). Explain sliding window protocol in detail with the concept of piggybacking.
b).Draw Manchester encoding and differential Manchester encoding for bit-stream: i)101100001101 ii)10000101111

8).TV channels are 6MHz wide. How many bits/sec can be sent if four level digital signals are used?
b)Explain the difference between Frequency Division and Time Division Multiplexing.

9).Explain Pulse Code modulation and Delta modulation.
b) Explain 802.5 Token Ring protocols in detail.

a)Half duplex and full duplex transmission
b)Base band and Broad band transmission media

a)Persistence and non-persistence protocols
b)GSM and CDMA technologies

a)point-to-point and broadcast network
b)flow control and congestion control

13).Write short note on:
a) E-MAIL b) SMTP c) UDP d) WAN e) MODEM

14).Which guided transmission medias are suitable for digital transmission? Describe the characteristics and applications of these medias.

15).Why are media access control protocols used in computer network? How are collisions controlled in ALOHA, Bit map and adaptive tree walk protocols?
b)How is multiplexing access controlled in CSMA protocols? Why is CSMA not suitable for wireless LANs? Describe one suitable MAC protocol for wireless LANs.

16).State the difference between flow control and congestion control.
b)Why do we need data link layer? Explain the reasons.

17).State and explain various routing techniques.
18).Describe the IEEE 802.5 token ring. Compare token ring, token bus and Ethernet.
19).Write short note on X.25.
20).Discuss collision free protocols in detail.


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