MI0035- COMPUTER NETWORKS

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ASSIGNMENT

DRIVE FALL	2013
PROGRAM	MBADS – (SEM 3/SEM 5) / MBAN2 / MBAFLEX – (SEM 3) / PGDISMN – (SEM 1)
SUBJECT CODE & NAME	MI0035- COMPUTER NETWORKS
SEMESTER	3
BK ID	B1481
CREDITS	4
MARKS	60

Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each question is followed by evaluation scheme.

Q. 1 A multiplexer takes several data communication lines or signals and converts them into one data communication line or signal at the sending location. Explain the basic methods of multiplexing.

Ans : Multiplexing is the name given to techniques, which allow more than one message to be transferred via the same communication channel. The basic methods are:

1. Frequency Division Multiplexing FDM:

2. Time Division Multiplexing TDM:

3. Wavelength Division Multiplexing (WDM)  :

1. Frequency Division Multiplexing FDM:

In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is

Q.2 Write short notes on

a. Network quality of service

b. Gateways

c. Mobile Telephone system

d. Geostationary satellites

e. Ethernet

Ans :

a. Network quality of service :

Quality of service (QoS) is the overall performance of a of telephony or computer network, particularly the performance seen by the users of the network. To quantitatively measure quality of service several related aspects of the network service are often considered, such as error rates, bandwidth, throughput, transmission delay, availability, jitter, etc. In particular, much technology has been developed to allow computer networks to become as useful as telephone networks for audio conversations, as well as supporting new applications with even stricter service demands.

Q.3 Describe the architectural framework of Integrated Services Digital Network (ISDN).

Ans : integrated architecture framework :

The Integrated Architecture Framework (IAF) is an enterprise architecture framework that covers business, information, information system and technology infrastructure. The first version was released in 1996 and was based on the Zachman Framework and Spewaks ideas about Enterprise Architecture Planning. The Integrated Architecture Framework is:

• A comprehensive framework to deliver market-leading solutions
• Adaptable to the specific needs of an organization
• Scalable from individual projects to enterprise-wide transformation
• A recognized architecture method in The Open Group’s IT Architecture Certification program (ITAC).

Q.4 LAN is a privately owned networks which spans over a size of up to a few kilometers in a building or a campus.

Ans : a. How can LAN be differentiated from other Networks.

A local-area network (LAN) is a computer network that spans a relatively small area. Most LANs are confined to a single building or group of buildings, however, one LAN can be connected to other LANs over any distance via telephone lines and radio waves. A system of LANs connected in this way is called a wide-area network (WAN). LANs have a number of  characteristics on the basis of which it is differentiated from other networks:

1. transmission medium is shared by all devices, eg connected by a common cable hence: transmission by one device is received by all others, ie a

Q.5 Read the following case study thoroughly and answer the following questions:

India is the second most populous country in the world. Even with abundant natural resources, it is still considered a developing country. In India, it is necessary that research and development that has taken place in the field of communication should reach rural areas. This is because nearly 70% of the population lives in villages. In India, physical infrastructure such as roads and highways is still not fully developed. Wired communication requires digging of roads, laying of cables and erecting towers. It involves tremendous human effort and enormous capital outlay in the rural and hilly areas. Hence wireless communication implemented through satellites can play a vital role. Realising the importance of satellite communication, India implemented Satellite Instructional Television Experiment (SITE) in 1975-76. This made it possible to broadcast educational and other programs related to family planning, agriculture and health issues through television sets even in the remote areas. This initiative helps in creating awareness and also helps government in bringing developmental schemes to the door step of the masses. An advantage of satellite communication is that, satellites can amplify the signals and resend it to thousands of stations on the ground at the same time. Digital TV and radio programmes can directly reach the receivers found in the cars and homes through a satellite. For large organisations, it has become much cheaper to transmit commercial information to thousands of their dealers scattered across the globe by means of satellites. Wired communication can easily get disrupted when the cables are damaged intentionally or unintentionally. However, microwave satellite communication is not affected even in the adverse environmental conditions. Thus, during the times of natural disasters, the physical infrastructure of wired communication may be destroyed. But still contact can be maintained with the affected people through the satellites. In addition, remote sensing satellites can be used to keep an eye on the enemy movements, determine the locations of natural resources, warn about impeding cyclones and exactly pinpoint the presence of fishes or submerged objects in the oceans or seas. Another form of wireless communication is the mobile communication. Mobile handsets have made it possible for the people not only to converse among themselves but also carry out banking and e-commerce transactions. Satellites have also made it possible the implementation of Global System for Mobile Communication(GSM) through which wireless Internet can be provided.

a. Highlight the advantages of wireless communication over wired communication.

b. In what ways, rural India has benefited through satellite communication.

Ans : a. Advantages of wireless communication over wired communication

Of the most important advantages of wireless networks that have made ​​them spread significantly and replace wired networks:

1. Flexibility (wirelessness):

the benefits of wireless networks over wired networks and one of the benefits of this flexibility, as radio waves go through walls and wireless computer you can be in any domain Mkanaly NickServ Point.

2. Ease of use:

Q. 6 Explain world wide web in detail.

Ans :  WWW :

The World Wide Web (abbreviated as WWW or W3, commonly known as the web) is a system of interlinked hypertext documents accessed via the Internet. With a web browser, one can view web pages that may contain text, images, videos, and other multimedia and navigate between them via hyperlinks. The terms Internet and World Wide Web are often used in everyday speech without much distinction. However, the Internet and the World Wide Web are not the same. The Internet is a global system of interconnected computer networks. In contrast, the web is one of the services that runs on the Internet.

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