MI0035 – COMPUTER NETWORKS

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ASSIGNMENT

DRIVE	SPRING 2016
PROGRAM	MASTER OF BUSINESS ADMINISTRATION (MBA)
SEMESTER	III
SUBJECT CODE & NAME	MI0035 – COMPUTER NETWORKS
BK ID	B1973
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.

Question.1. Explain the concept of computer networks. Briefly explain the different types of networks.

Answer:A computer network is a set of connected computers. Computers on a network are called nodes. The connection between computers can be done via cabling, most commonly the Ethernet cable, or wirelessly through radio waves. Connected computers can share resources, like access to the Internet, printers, file servers, and others. A network is a multipurpose connection, which allows a single computer to do more.

Types of Network Connections

Question.2. Write a brief note on seven layered OSI reference model. Explain the role of each layer.

Answer:The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. In the OSI model, control is passed from one layer to the next, starting at the application layer in one station, and proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.

Question.3. Write short notes on the following:

a. Subnet

Answer:A subnetwork, or subnet, is a logical, visible subdivision of an IP network.[1] The practice of dividing a network into two or more networks is called subnetting.

Computers that belong to a subnet are addressed with a common, identical, most-significant bit-group in their IP address. This results in the logical division of an IP address into two fields, a network or routing prefix and the rest field or host identifier. The rest field is an identifier for a specific host or network interface.

b. Super netting

Answer:A supernetwork, or supernet, is an Internet Protocol (IP) network that is formed from the combination of two or more networks (or subnets) with a common Classless Inter-Domain Routing (CIDR) prefix. The new routing prefix for the combined network aggregates the prefixes of the constituent

c. Subnet masks

Answer:An IP address has two components, the network address and the host address. A subnet mask separates the IP address into the network and host addresses (<network><host>). Subnetting further divides the

d. Dynamic NAT

Answer:It is a type of NAT in which a private IP address is mapped to a public IP address drawing from a pool of registered (public) IP addresses. Typically, the NAT router in a network will keep a table of registered IP addresses, and when a private IP address requests access to the Internet, the router chooses an IP address from the table that is not at the time being used by another private IP address. Dynamic NAT helps to secure

e. Domain Name System

Answer:DNS is an abbreviation for Domain Name System, a system for naming computers and network services that is organized into a hierarchy of domains. DNS naming is used in TCP/IP networks, such as the Internet, to locate computers and services through user-friendly names. When a user enters a DNS name in an application, DNS services can resolve the name to other information associated with the name, such as an IP address.

Question.4. What is Dense Wavelength Division Multiplexing (DWDM)? What are the pros and cons ofDWDM?

Answer:DWDM increases the bandwidth of an optical fiber by multiplexing several wavelengths (or colors) onto it. Even though it costs more than CWDM, it is currently the most popular WDM technology because it offers the most capacity. By providing channel spacings of 50 GHz (0.4 nm), 100 GHz (0.8 nm) or 200 GHz (1.6 nm), several hundreds of wavelengths can be placed on a single fiber. Most typical DWDM systems use 40 or 80 channels, although this number can be as high as 160.

Question.5. Explain the working of Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Protocol.

Answer:Carrier sense multiple access with collision detection (CSMA/CD) is a media access control method used most notably in local area networking using early Ethernet technology. It uses a carrier sensing scheme in which a transmitting data station detects other signals while transmitting a frame, and stops transmitting that frame, transmits a jam signal, and then waits for a random time interval before trying to resend the frame.

CSMA/CD is a modification of pure carrier sense multiple access (CSMA). CSMA/CD is used to improve CSMA performance by terminating

Question.6. Briefly explain the functions of network management model.

Answer:Network management means different things to different people. In some cases, it involves a solitary network consultant monitoring network activity with an outdated protocol analyzer. In other cases, network management involves a distributed database, autopolling of network devices, and high-end workstations generating real-time graphical views of network topology changes and traffic. In general, network management is a service that employs a variety of tools, applications, and devices to assist human network managers in

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