Gujarat University 2009-3rd Year B.C.A Computer Application Data Communication and Network - Question Paper

Data Communication and Network April 2009

Total Marks 70 Duration : three hrs

Instructions
Figures to the right indicate full marks.
Answers of all sub ques. should be written in continuos order.
Make and state any neccessary assumptions.
Draw figures wherever neccessary.

1 ans the subsequent. (14 marks)

(A) ans the subsequent (Any three) (10 Marks)
1 discuss functioning of Cellular Radio.
2 discuss Twisted Pair Wire in detail with diagram.
3 discuss Time Division Multiplexing (TDM) with suitable diagram.
4 Write short note on source of Errors.

(B) ans any 1 of the subsequent. (4 Marks)
1 discuss fault detection methods parity checking and CRC with suitable examples. Why is parity checking only 50% effective ?
2 discuss the functioning of Network Layer (Layer-3) and Data Link Layer (Layer-2) of OSI Model.

2 ans the subsequent. (14 Marks)

(A) ans any ten of the subsequent. (10 Marks)
1 How are the guardbands used to protect data in frequency division multiplexing ?
2 What is piconet ?
3 provide the full form of APPC ?
4 describe Frame Relay
5 Differentiate ranging from Bridge and Gateway.
6 A network that uses fixed size messages is called a ________________ network.
7 If a data transmission line can transmit in the frequency range of 1,000 MHz to 7,300 MHz, wha is its bandwidth?
8 Differentiate ranging from a tandem office and toll office.
9 Microwaves are unidirectional. This means that they travel ___________________
10 describe ATM.
11 What is three G.IP ?
12 List the 3 hardware components need in a LAN.

(B) ans any 2 of the subsequent. (4 Marks)
1 define applications of Data Communications.
2 discuss the concept of Telephone System.
3 discuss Terrestrial Microwave Transmission.

3 ans the subsequent. (14 Marks)

(A) ans any 4 of the subsequent. (12 Marks)
1 discuss the performance and availability factors in network management
2 What is Encryption? discuss Symmetric key Encryption.
3 Compare Peer to Peer LAN and Server based LAN.
4 Make a comparison ranging from all the layers of SNA,SAA and OSI model.
5 discuss the concept of Routing with all its kinds.
6 explain in brief Bluetooth and Infrared Data Association (IrDA)

(B) Sketch the Waveform for bit patten 1100101011 using two
1 NRZ Encoding
2 Bipolar Encoding

4 ans the subsequent. (14 Marks)

(A) ans any 3 of the subsequent. (9 Marks)
1 Write a note on Electronic Mail Protocols.
2 discuss Packet switching network with suitable diagram.
3 List out and discuss various topologies used in MAN.
4 discuss Token Ring Network and Token Bus Network with LAN topology.
5 provide the comparison ranging from TCP\IP and OSI Model.

(B) discuss any 1 of the subsequent. (5 Marks)
1 describe Modulation. discuss various kinds of Analog Modulation.
2 discuss Pulse Code Modulation Technique (PCM) in Analog to Digital Modulation.

5 ans the subsequent. (14 Marks)

(A) ans any 1 of the subsequent. (4 Marks)
1 describe Distributed Systems. List out kinds of distributed systems and discuss any 2 of them.
2 discuss TCP\IP Protocol.

(B) ans any 5 of the subsequent. (10 Marks)
1 Data Transmission Modes.
2 RS-232F Interface
3 CDMA
4 Special Perpose Modems
5 Repeaters and Routers
6 Repeaters and Routers
6 Firewalls

Earning:   Approval pending.