1 Q1. Attempt any THREE 09 1 Give the difference between Human Network and
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1 Sanjivani Rural Education Society s CLASS-TEST-I YEAR: SANJIVANI K.B.P.POLYTECHNIC, KOPARGAON Model Answer Sub:- Computer Network Sub. Code: Class :- Div:- A & B SYCM Dept. :- Computer Technology Pages:-05 Marks:25 Name of subject teacher:-prof. Jadhav S.B. Que No Sub Que Topic Marks Total 1 Q1. Attempt any THREE 09 1 Give the difference between Human Network and Computer network Answer: (Each point- 1 Mark) Human Network 1. Human Network is a network of human beings. 2.It consist of individuals, organizations, schools, hospitals, work places etc. 3.Example: 1.Family network, Peer Network, Restaurant Network, Contact Network Computer Network 1.Computer network is a interconnections of two or more computers 2.It consist of computers & connecting devices like as Hub or printer etc. 3.Example : Internet 2 Give the classification of computer network. Answer: (Classification 3 Marks 1and ½ mark each) Networks are classified depending on the geography & their components. Classification of network by their geography: 1. PAN 2. CAN 3. LAN 4.MAN 5.WAN Classification of network by their component role: 1. Peer-to- Peer Network 2. Client-server network 3 What is network topology? State its Types. Answer: (Definition- 1 Mark, Listing 2 Marks) Topology: A topology is a usually Schematic description of the arrangement of a network including its nodes and connecting lines (links). OR The way in which computers are connected in a network is called as topology. 1
2 OR It is physical interconnection between various elements on computer network such as links & nodes. Types of topologies: 1. Bus 2. Ring 3. Star 4. Mesh 5. Tree 6. Hybrid 4 State the benefits of Computer Network. Answer: (1/2 marks each, any six) 1. Sharing the resources such as printers among all the users. 2. Sharing of expensive software & hardware. 3. Communication from one computer to other. 4. Exchange of data & information amongst the users, via the network. 5. Sharing of information over the geographically wide areas. 6. For connecting the computers between various buildings of an organization. 7. For educational purposes. 8. Maintenance is limited to the servers & clients 2 Attempt any TWO 08 1 Compare LAN, WAN, MAN Answer: (1 mark for each point, any four comparison points) LAN MAN WAN 1. Area Network within a single building or campus of up to a few KM in size Km campus. 2. LAN network has very high speed mainly due to proximity of computer and network devices. 1. Area-Network within over an entire city. Up to 10km 2. MAN network has lower speed compared to LAN. low. moderate. 4. Transmission 4.Transmission media coaxial media-cables, cable. PSTN,optical fiber cables, wireless 5. Data rate is high. 5. Data rate is moderate. 1.Area Network spans a large geographical area after a country or continent 100 km km, country, continent 2.WAN speed varies based on geographical location of the servers. WAN connects several LANs high. 4. Transmission media PSTN or Satellite links. 5. Data rate is low. 2
3 2. Give the difference between Bus and Star Topology. Answer: (1 mark each, any four points) 3. What is HUB? State its Types Answer: (Hub 1 mark, Types 1 mark each) HUB: Hub is a connecting device; it is also known as multiport repeater. It is normally used for connecting stations in a physical star topology. All networks require a central location to bring media segments together. These central locations are called hubs. A hub organizes the cables and relays signals to the other media segments. There are three main types of hubs: 1) Passive 2) Active 3) Intelligent Passive Hubs: A passive hubs simply combines the signals of a network segments. There is no signal processing or regeneration. A passive hub reduces the cabling distance by half because it does not boost the signals and in fact absorbs some of the signal. With the passive hub each computer receives the signal sent from all the other computers connected to the hub. Active hubs: They are like passive hubs but have electronic components for regeneration and amplification of signals. by using active hubs the distance between devices can be increased. The main drawback of active hubs is that the amplify noise along with the signals. They are also much expensive than passive hubs. 3
4 Intelligent hubs: in addition to signal regeneration, intelligent hubs perform some network management and intelligent path selection. One advantage to this is that all transmission media segment can be connected permanently because each segment will be used only when a signal is sent to a device using that segment. 3 Attempt any TWO Explain Client-Server network. State its advantages and disadvantages. Answer: (Explanation 2 marks, advantages and disadvantages 2 marks) Client Server Network: Server based networks are defined by presence of servers on a network that provides security & administration of network. Server-based network divide processing takes between client & servers. Client request service such as file printing & servers deliver them. Servers are more powerful than client computers. Advantages: 1. Strong central security 2. Ability to share expensive equipment s such as printer. 3. Ability of server to pull available hardware & software. 4. Easy manageability of large user. Disadvantages: 1. Expensive dedicated hardware. 2. Expensive network operating system software & client license. 3. A dedicated network administrator. 4
5 2. Describe Repeater. State the situation under which repeater is necessary in network. Answer: (Any 2 functions 1M; Situation: 2M) Repeaters are used to take the distorted, weak and corrupt input signal and regenerate this signal at its output. It ensures that the signals are not distorted or weak before it reaches the destination. It recreates the bit pattern of the signal, and puts this regenerated signal back on to the transmission medium. It works in the physical layer with no intelligent function. Situations In any computer network, when the data bit pattern is sent from a computer A to Computer B, if Computer B is not able to receive the exact data bit pattern, a repeater is connected in between. This will regenerate the weak signal so that the exact replica of the original input signal is sent forward. A repeater can be used at as many points in the network as required. 3. Draw a neat labeled sketch of a hybrid topology connecting one star network of 4 computers, one ring network of 5 computers and one bus network of 5 computers. Answer: (Correct Diagram 4 marks) 5
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