PSEB Punjab Board Class 9 Computer Science Textbook Solution Chapter 1 Networking Exercise Questions and Answers
Question 1:
Multiple Choice Questions:
(1) ……………………….. is a group of two or more computers that are linked in order to share resources such as printers, files and other resources.
(a) Network
(b) Internet
(c) Wireless
(d) Topology
Ans: (a) Network
(2) Which of the following is the smaller type of network?
(a) MAN
(b) WAN
(c) LAN
(d) None of these
Ans: (c) LAN
(3) ………………….. is a device that allows you to connect multiple computers to a single network.
(a) HUB
(b) BUS
(c) Ring
(d) Star
Ans: (a) HUB
(4) In …………… network topology, a single backbone cable is shared by all the devices.
(a) BUS
(b) TREE
(c) MESH
(d) STAR
Ans: (a) BUS
(5) …………… prepares information and sends it.
(a) Protocol
(b) Receiver
(c) Sender
(d) Hub
Ans: (c) Sender
Question 2:
Write True/False :-
(1) We cannot share hardware and software among network devices.
Ans: False
(2) LAN covers a large geographic area.
Ans: False
(3) In full duplex, information can be transmitted in both directions.
Ans: True
(4) Protocols are set of rules by which data transmission takes place between nodes.
Ans: False
Question 3:
Write the full forms of :-
(1) LAN: Local Area Network
(2) MAN: Metropolitan Area Network
(3) WAN: Wide Area Network
(4) PAN: Private Area Network
(5) NIC: Network Interface Card
Question 4:
Short answer type questions :-
(1) Write the names of any four Network Topologies.
Ans: Bus topology, Ring topology, Star topology and Mesh topology are the four network topologies.
(2) Define Network Interface Card (NIC)
Ans: You can easily connect the connect the computer to the network as Network
Interface Card (NIC) is placed/installed on the mother board inside the system unit. It
can be added for each client and server computers. NIC is also known as Printed Circuit
Board (PCB).
There are two kinds of Network Interface Card (NIC) which are :-
(a) Ethernet Card: In this type of card, for data transmission ethernet cables and
connectors are been made used.
(b) Wireless Card: In this type of card, use of cables or connectors are not made.
Here for the data transmission, the use of antennas is made which creates radio
waves technology.
(3) Write the name of components of data communication.
Ans: The components of data communication are Sender, Receiver, Protocol,
Medium etc.
(4) Write a short note on HUB.
Ans: HUB is also called as Switch. It is used for connecting many computers in a single network. In the hub, the duplication of packets (data) that is received at one port and is distributed to the other ones. Hence the data is shared within all the connected devices those are connected to the hubs/switches.
(5) What are the types of ring topologies?
Ans: There are two kinds of ring topologies which are Single ring topology and Dual
ring topology.
Question 5:
Long Answer type questions :-
(1) What is Network? Explain its advantages and disadvantages.
Ans: It is a collection of computers and devices (which are sued for connecting to a network) that are connected by the communication means /channels or Networking is the connection of computers with the help of cables or wires, with an intention of sharing information from one computer to another. In the network, the computer users can share the softwares and harwares too. The use of radio signals (wireless/wi-fi), telephone lines (modems) or satellite links for long distances are used for creating networks. The computer device which is not connected in the network with other computers is called as Standalone computer.
The advantages and disadvantages of a network are as followed :-
Advantages of Network
(a) Sharing of resources :-
The main purpose for computer network is to run all the devices connected to it properly like printer, scanner, plotter etc. If any person in the network need to print some important document, but has no separate printer, then he/she can directly make use of the printer connected in a network. In this manner you use/ connect less devices in the network but in a cheaper mode.
(b) Reliability and availability :-
If any device connected to any computer in the network is damaged/ or defective, then till the faulty device is replaced/repaired we can make use of other devices connected to other computers in the network. If incase any important file/data you need from any of the computer in the network and that computer is faulty or file/data by mistakenly gets deleted or corrupted, then you can retrieve/access the data back again from the other computer connected into a network.
(c) Cost reduction :-
Its very difficult/expensive for any user to purchase/use the devices (hardware or software) separately for his use but he can make use of the devices connected into the network which ever he does not have.
(d) File integrity :-
Due to the network it is a continuous process. The time can be saved a lot as if the file can be shared and shared in a very faster manner.
(e) Flexibility :-
In the network, there is a flexibility as if the computers of different organizations can be easily added/connected in the network.
(f) Speed :-
The files on the network can be saved and shared so fatly so that it can save the user’s time and money.
(g) Security :-
In the network, there is assurance of security. There is a restriction for the network user to make use of the file or any applications.
(h) Backup :-
Some times many of the people face the problem of retrieving the back up in which many of the important files or applications are been lost. In the network, such type of problem is completely avoided, as if any computer that is connected in the network can completely get /retrieve the backup from the server.
Disadvantages of Networks
(a) Network failure :-
As all the computers are been connected to each other in a network. If there is any failure in the network, then the central functions/facilities also fails.
(b) Management :-
The maintenance or management of the network is not a simple task. It cannot be managed or maintained by any single persons. For accomplishing this task, there is a need/requirement of such technical experts, which increases the extra cost of their remuneration.
(c) Security :-
In the network there is a possibility of security threats which enhances the misuse of data.
(d) Expensive to form :-
For forming the network, there is requirement/need of cables, hardware devices etc and their cost is also very high. So it acts as very expensive for gathering such things and forming a network for the big organizations.
(2) Explain the various components of computer network.
Ans: The various components of computer network are as followed :-
(a) Computer :-
The objective of a network is to make the connection between two or more computers. Before forming the computer network, we must confirm about the computers and their users that wants to get involved in the computer network. There are two types of computers which are mostly used and needed to form a computer network which are
(i) Client :-
Clients are the normal computers that we use. These are the computers which are connected to each other in the network for the purpose of sharing the different kinds of resources. If they want any information, they receive it from the server.
(ii) Server :-
This acts as a very powerful computer in a network. The server performs the task of providing information/sharing the resources within the network. Its controls all the nodes in the network.
(b) Network Interface Card (NIC) :-
You can easily connect the connect the computer to the network as Network Interface Card (NIC) is placed/installed on the mother board inside the system unit. It can be added for each client and server computers. NIC is also known as Printed Circuit Board (PCB). There are two kinds of Network Interface Card (NIC) which are :-
• Ethernet Card :- In this type of card, for data transmission ethernet cables and connectors are been made used.
• Wireless Card :- In this type of card, use of cables or connectors are not made. Here for the data transmission, the use of antennas is made which creates radio waves technology.
(c) HUB/Switch :-
HUB is also called as Switch. It is used for connecting many computers in a single network. In the hub, the duplication of packets (data) that is received at one port and is distributed to the other ones. Hence the data is shared within all the connected devices those are connected to the hubs/switches.
(d) Routers :-
It is a device that is used to analyse, receive and forward the data in the network or to the another one (network). In the network whatever the data packets its receiving, Routers are makes a way for the forwarding.
(e) Transmission media :-
This is the medium or path which is used to perform the task of carrying the information or data from the receiver to the sender. There are two types of transmission medias which are :-
• Guided media :- This media has wires for carrying information or data ie. Is Coaxial cables, Twisted Pair cables, Optical Fibres etc.
• Unguided media :- This media does not have wires. They carries the information with the help of microwave signals, satellites etc. They are wireless.
(3) Write different types of network.
Ans: The different types of network are as followed :-
(i) Linear or Bus Topology:
(a) All the computers are connected with a single cable (coaxial cable)
(b) At the both ends of the cables there is a terminator which are connected to computer and a network interface card (NIC) which have different addresses.
(c) In this topology, its not compulsory that every computer should be in working state (if any computer in the network gets default, then other computers in the network continues working. New node (device) can be added in the topology if we need its.
(d) Its very difficult to detect any fault/problem as if this topology is not decentralized.
(e) If the topology is long, then Repeaters can be made use of. But if there’s any fault in the cable the whole topology/network fails/stops.
(ii) Circular or Ring Topology:
(a) The cables like Twisted pair, coaxial, or optical cables are used to connect the nodes to each other in a ring.
(b) Each node is connected to each other with adjacent ways one node receives the
data and transmits to the other node.
(c) The data signal is clearly checked by the first node before transmitting it to the next.
(d) There no main computer for controlling the other computers/network. So there’s no question rise of depending on single computer for data communication.
(e) There’s no need of repeaters in this topology.
(f) The whole network gets disturbed if there’s any fault in one computer. All the networks becomes useless if any computer is been added or removed from the network.
(i) Single Ring topology:
In this topology are the devices those are connected in the network are connected to each other with the help of a single cable, which enhances the single flow of data only which means the other device needs to wait before sending its data until the data of the first device sent reaches its final place.
(ii) Dual Ring topology:
In the data is sent in the both ways/ directions i.e is in the form of clockwise and anti clockwise. In this network, more packets are been sent.
(iii) Star topology:
(a) The nodes which are connected to the main computer are called as hub or host.
(b) No two nodes are connected to each other directly with the help of the main computer all the nodes communicates with each other and controls the communication between them.
(c) If any node is defective, then other nodes can be helpful for data transmission but if the main computer gets defected then the data is not transmitted as the main computer is an important part in the star topology.
(d) More cable is required.
(iv) Tree Topology:
This topology is similar to bus topology. The nodes in this topology are connected to each other in hierarchical manner. In which the node at the top is known as the root node. The sub nodes are connected to the root node in the same way. This sub nodes has several levels like primary, secondary, tertiary. The data which is flowed from various levels. In such type of applications this topology is useful.
(v) Graph or Mesh Topology:
In this type of topology, the use of any special structure is avoided in connecting the nodes to each other. The nodes are connected to each other directly. This topology may have more than one nodes and these nodes are connected to each other any how or there’s no need of connecting all the nodes to each other.
(vi) Hybrid topology:
In this topology the use of two or more topologies are been made. The topologies like bus topology, star topology, ring topology, tree topology, mesh topology are been used. This topology is formed by the combination of two or more topologies.
(4) Explain the various modes of data transmission.
Ans: Data transmission mode means how and in which direction the data is transferred between the sender and receiver.
(a) Simplex mode: In this type of data transmission, the data is transferred in one
direction only. This mode allows only one i.e is sender to send the
data/information whereas receiver can sent it. Receiver only has to intake the
sent data/information. Ex :- Television communication
(b) Half- Duplex mode: In this mode, the data/information can be transferred in
both directions but not at the same time. If the information or data is transferred
from one node, then the second node can only receive it and vice versa. For ex :-
police or army walky-talky.
(c) Full- Duplex mode: In this mode, the data/information can be transferred in
both the ways but that too at the same time. For ex :- Telephone system
communication.
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