8/12/2019 17403_test111

1/3

CA-2, Computer Networks (EC428)

SET A Max marks: 30

Name: Registration No.: Section: Roll No.

Instruction: It is mandatory to attempt all the questions and to fill the details mentioned above. Non Compliance to aboveinstructions may lead to no evaluation of your sheet.

Q.1 What are the propagation time and the transmission time for a 5-Mbyte message (an image) if

the bandwidth of the network is 1 Mbps? Assume that the distance between the sender and the

receiver is 12,000 km and that light travels at 2.4 108m/s. [5]

Q.2 Describe the frame format of 802.3? [5]

Q.3 Explain the concept of CSMA/CD with the help of a flow chart? [5]

Q.4 Briefly explain the necessity of Error Detection and describe the use of parity bits for detecting

errors at Receiver side. [5]

Q.5 Explain the synchronous means of data transmission? Suggest some advantages of synchronous

transmission of data over asynchronous transmission? [5]

Q.6 Describe the structure of coaxial cable? [5]

CA-2, Computer Networks (EC428)

SET B Max marks: 30

Name: Registration No.: Section: Roll No.

Instruction: It is mandatory to attempt all the questions and to fill the details mentioned above. Non Compliance to above

instructions may lead to no evaluation of your sheet.

Q1 What are the propagation time and the transmission time for a 2.5-kbyte message (an e-mail) if

the bandwidth of the network is 1 Gbps? Assume that the distance between the sender and the

receiver is 12,000 km and that light travels at 2.4 108

m/s. [5]

Q.2 Compare the standard Ethernet common implementations of 802.3? [5]

Q.3 Describe the advantages of Controlled Access Protocols over Random Access Protocols. How SEL

and POLL function helps us to avoid collisions? [5]

Q.4 Describe the use of Cyclic Redundancy Check for detecting errors at Receiver side. [5]

Q.5 Explain the asynchronous means of data transmission? Write the disadvantages of asynchronous

transmission? [5]

Q.6 Differentiate between Shielded Twisted pair cable and Unshielded twisted pair cable. [5]

8/12/2019 17403_test111

2/3

CA-2, Computer Networks (EC428)

SET C Max marks: 30

Name: Registration No.: Section: Roll No.

Instruction: It is mandatory to attempt all the questions and to fill the details mentioned above. Non Compliance to aboveinstructions may lead to no evaluation of your sheet.

Q.1 Assume that, in a Stop-and-Wait ARQ system, the bandwidth of the line is 1 Mbps, and 1 bit

takes 20 ms to make a round trip. What is the bandwidth-delay product? If the system data frames

are 1000 bits in length, what is the utilization percentage of the link? [5]

Q.2 Describe the role of LLC Layer of 802.3 with the help of frame structure? [5]

Q.3 Describe the advantages of Controlled Access Protocols over Random Access Protocols. How

token passing protocol helps us to avoid collisions? [5]

Q.4 What should be the size of the Go Back N ARQ window and why? Justify your answer with

suitable diagrams.[5]

Q.5 Describe the concept of Direct Sequence Spread Spectrum? [5]

Q.6 Encode the incoming data 0 0 1 1 0 1 0 1 0 1 1in this format (i) Unipolar RZ and (ii) B-AMI. [5]

CA-2, Computer Networks (EC428)

SET D Max marks: 30

Name: Registration No.: Section: Roll No.

Instruction: It is mandatory to attempt all the questions and to fill the details mentioned above. Non Compliance to above

instructions may lead to no evaluation of your sheet.

Q.1 Assume that, in a Go BACK N ARQ system, the bandwidth of the line is 1 Mbps, and 1 bit takes 20

ms to make a round trip. What is the bandwidth-delay product? If the system data frames are 1000

bits in length, what is the utilization percentage of the link? [5]

Q.2 Describe the role of MAC Layer of 802.3 with the help of frame structure? [5]

Q.3 Describe the three persistence methods of the CSMA? [5]

Q.4 Differentiate between error control and error detection techniques. Explain the Stop and Wait

ARQ protocol? [5]

Q.5 Describe the role of Frequency Hopping Spread Spectrum? [5]

Q.6 Encode the incoming data 0 0 1 1 0 1 0 1 0 1 1in this format (i) Split Phase Manchester and (ii)

Polar NRZ [5]

8/12/2019 17403_test111

3/3

CA-2, Computer Networks (EC428)

SET E Max marks: 30

Name: Registration No.: Section: Roll No.

Instruction: It is mandatory to attempt all the questions and to fill the details mentioned above. Non Compliance to aboveinstructions may lead to no evaluation of your sheet.

Q.1 Assume that, in a Selective Repeat ARQ system, the bandwidth of the line is 1 Mbps and 1 bit

takes 20 ms to make a round trip. What is the bandwidth-delay product? If the system data frames

are 1000 bits in length, what is the utilization percentage of the link? [5]

Q.2 How Switched Ethernet helps in enhancing the efficiency of the system? [5]

Q.3 Describe the mechanism used in CSMA/CA to avoid collisions? [5]

Q.4 Briefly describe the need of error control techniques. Explain the Selective Repeat ARQ protocol

to control errors. [5]

Q.5 Differentiate between synchronous TDM and statistical TDM with the help of frame formats? [5]

Q.6 Explain the modulation process of digital data using analog signal as carrier. The modulated

signal must represent digital data in the form of amplitude variations. [5]

CA-2, Computer Networks (EC428)

SET F Max marks: 30

Name: Registration No.: Section: Roll No.

Instruction: It is mandatory to attempt all the questions and to fill the details mentioned above. Non Compliance to above

instructions may lead to no evaluation of your sheet.

Q.1 A 4 Mbps token ring has a token holding time value of 10msec. What is the longest frame that

can be sent on this ring? [5]

Q.2 Describe the role of bridges in Wired LAN? How it helps in enhancing the bandwidth of system.

[5]

Q.3 Describe the concept of Multiple Access Protocols? Explain the principle of Adaptive Tree Walk

Algorithm. [5]

Q.4 Differentiate between error control and flow control. Explain the sliding window method of flow

control?

Q.5 Differentiate between Frequency Hopping Spread Spectrum and Frequency Division

Multiplexing. Define the bandwidth requirements for each technique using an example. [5]

Q.6 Explain the modulation process of digital data using analog signal as carrier. The modulated

signal must represent digital data in the form of frequency variations. [5]