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Chapter 6

Network

Class 8 - APC Understanding Computer Studies with BlueJ


Fill in the blanks

Question 1

A system of interconnecting computers is known as Computer Network.

Question 2

Cloud computing means storing, accessing information over the Internet other than hard drive of your system.

Question 3

Coaxial/telephone cable sends analog signal during the data transmission.

Question 4

Protocol is a set of rules and procedures to establish a link between the sender and the receiver.

Question 5

In a star topology, the host computer is connected to local computers.

Question 6

A combination of different types of network is known as Hybrid network.

Question 7

Wi-Fi system means wireless data transmission.

Question 8

A digital signal works on discrete data, which states only two conditions.

Question 9

In a Star topology, the local computers are connected to host computers.

Question 10

A medium provides the path through which a message travels from a source to the destination.

State whether the following statements are 'True'/'False'

Question 1

Modulation is the process of converting analog signals to digital signals.
False

Question 2

There is no difference between an analog signal and a digital signal.
False

Question 3

A medium carries the transmitted messages to the destination.
True

Question 4

A modem converts only analog signals to digital signals.
False

Question 5

IP address is the unique address to a computer by ISP (Internet Service Provider).
True

Question 6

Switch is defined as a collection of buttons in a networking system.
False

Question 7

Bluetooth is one of the means of communication protocols.
True

Write the full form of the following

Question 1

IMAP

Answer

Internet Message Access Protocol

Question 2

DSL

Answer

Digital Subscriber Line

Question 3

GPRS

Answer

General Packet Radio Service

Question 4

PAN

Answer

Personal Area Network

Question 5

USB

Answer

Universal Serial Bus

Question 6

BSNL

Answer

Bharat Sanchar Nigam Limited

Question 7

SMTP

Answer

Simple Mail Transfer Protocol

Question 8

HTTP

Answer

Hyper Text Transfer Protocol

Question 9

DNS

Answer

Domain Name System

Question 10

TCP

Answer

Transmission Control Protocol

Name the following

Question 1

Three elements of communication system

Answer

(a) Network Components
(b) Transmission Media
(c) Transmission Signals

Question 2

Three types of communication protocols

Answer

(a) Hyper Text Transfer Protocol (HTTP)
(b) File Transfer Protocol (FTP)
(c) Internet Protocol (IP)

Question 3

Three types of Network topologies

Answer

(a) Star Topology
(b) Ring Topology
(c) Complete Topology

Question 4

Three types of Network components

Answer

(a) Sender
(b) Medium
(c) Receiver

Question 5

Three types of Computer Networks

Answer

(a) Personal Area Network (PAN)
(b) Local Area Network (LAN)
(c) Wide Area Network (WAN)

Question 6

Three types of cables used in the data transmission

Answer

(a) Twisted Pair Cable
(b) Coaxial Cable
(c) Optical Fiber Cable

Write short notes on the following

Question 1

Computer Network

Answer

A Computer Network can be defined as a group of computers and other peripheral devices that are linked together for the purpose of sharing data and hardware resources. Computer Networks help in information sharing, resource sharing, efficient use of storage, timely communication, etc. The different types of computer networks are PAN, LAN, CAN, MAN and WAN.

Question 2

Transmission Control Protocol

Answer

Transmission Control Protocol (TCP) is a network communication protocol used for reliable data transmission over the network. It specifies how the data should be divided into packets on the sender's side and how these packets should be re-assembled on the receiver's side to retrieve the data. TCP works in collaboration with Internet protocol (IP) to divide the data into packets and route the packets over the network to their correct destination.

Question 3

Communication Protocol

Answer

Communication Protocols are formal descriptions of digital message formats and rules that govern the data communication between computing systems over a network. They cover authentication, error detection and correction, signalling, etc. They also describe the syntax, semantics and synchronisation of analog and digital communications. They mainly involve the following — (a) Broadband (b) Wi-Fi System (c) Bluetooth

Question 4

Internet Service Provider

Answer

An Internet Service Provider (ISP) is an organisation that provides the facility of availing internet services against a fee. They provide a gateway to the Internet where you can send and receive email, do online shopping, research work, etc. An ISP includes various providers such as:

  1. Internet Cable Service Providers
  2. Internet Wireless Service Providers
  3. Internet Broadband Service Providers

Among the largest national and regional ISPs are BSNL, Reliance Jio, Airtel, Vodafone, etc.

Question 5

Modem

Answer

A Modem modulates outgoing digital signals from a computer or other digital device to analog signals through telephone lines. It demodulates the incoming analog signal and converts it to a digital signal for the digital device. The different types of modems are Internal Modem, External Modem, GPRS Modem, USB Modem, etc.

Question 6

Domain Name Server

Answer

Domain Name Servers are the phone book of the Internet. They convert human readable domain names like www.google.co.in or www.wikipedia.org into their respective IP addresses.

Question 7

Router

Answer

A Router is a communication device that is used to connect two different networks, such as two LANs or a LAN and a WAN. It plays an important role in controlling the traffic and keeping the network efficient. It selects the best routes for the data packets to be sent from the sender to the receiver.

Question 8

File Transfer Protocol

Answer

File Transfer Protocol (FTP) is a standard internet protocol. It is the simplest way to exchange files between the computers on the Internet. FTP works in the same way as HTTP works for transferring web pages from a server to a user's browser and the Simple Mail Transfer Protocol (SMTP) which transfers email. FTP uses the Internet's TCP/IP protocols to enable the data transfer. It is commonly used to upload/download files to and from the servers over the Internet.

Give two differences between the following

Question 1

Local Area Network and Wide Area Network

Answer

Local Area NetworkWide Area Network
A local area network is restricted to a limited geographical area.A wide area network may operate on a worldwide or nationwide basis.
In a local area network, the computers, the terminals and the peripheral devices are connected to each other through wires and coaxial cables.In a wide area network, there may not be physical connection between various computers.

Question 2

Analog Signal and Digital Signal

Answer

Analog SignalDigital Signal
Any type of signal or wave which is continuously varying in nature is known as analog signal.A digital signal works on discrete data.
By observing the pattern of the output wave, we can conclude the result.It states only two condition i.e. 'True'/'False' or 'High'/'Low' or 'Present'/'Absent'.

Question 3

Star Topology and Ring Topology

Answer

Star TopologyRing Topology
In star topology the local computers are connected to the host computer.In ring topology, all local computers are connected to each other in a ring arrangement.
Transmission delays between the two terminals do not increase by adding a new terminal.Addition of a new terminal in the network delays the communication.
If the transmission of the host computer fails, the entire network fails.Failure of one computer does not bring down the whole network.

Question 4

Intranet and Internet

Answer

IntranetInternet
Intranet is a computer network within an organisation, used to share files and resources of the organisation securely.Internet is a global wide area network that connects computer systems across the world.
The private information of an organisation cannot be accessed by any outside person as it is protected by firewall.The public information on the internet is accessible to all.
Intranet can be safely privatized as per the need.Internet is not as safe as Intranet.

Short Answer Questions

Question 1

What is means by the communication system? Name all the elements of a communication system.

Answer

A communication system is a collection of individual communication networks which interconnect and inter-operate to form an integrated communication environment. The purpose of a communication system is to facilitate effective communication from the source to the destination. It involves the following elements:

  1. Network components
  2. Transmission media
  3. Transmission signals
  4. Communication protocol

Question 2

What is Network Component? Explain with reference to a communication system.

Answer

Network Components help in transferring data from one point to another by using resources. The data maybe analogous or digital in nature. In any communication process, three elements are essentially needed. They are:

  1. Sender — It creates the messages to be transmitted.
  2. Medium — It carries the transmitted messages to the destination.
  3. Receiver — It receives the messages from the source.

Question 3

Explain the term 'Network Topology'. Name the different types of topologies.

Answer

Network Topology is the arrangement of various elements (links, nodes, etc.) of a computer on a logical network. The different types of topologies are:

  1. Star
  2. Ring
  3. Complete
  4. Hybrid
  5. Multipoint (Bus)

Question 4

What are the advantages of a USB Modem over an External Modem? Explain.

Answer

USB modems are small and portable as compared to external modems. They do not require a power source and can be plugged into any USB port on the PC. They can be disconnected from the computer without turning off the system.

Question 5

What is a computer network? Explain different types of computer networks.

Answer

A Computer Network can be defined as a group of computers and other peripheral devices that are linked together for the purpose of sharing data and hardware resources. Computer Networks help in information sharing, resource sharing, efficient use of storage timely communication, etc. The different types of computer networks are:

  1. Personal Area Network (PAN) — This network is used to establish communication among computer devices within the range of 20 to 30 feet. This network maybe wired with computer buses (e.g. USB) or maybe a wireless network through Bluetooth.
  2. Local Area Network (LAN) — It is a digital communication system that interconnects a large number of computers and other peripheral devices. This type of network is generally preferred within a smaller area such as an office building or a lab building (say within a radius of half a kilometer).
  3. Campus Area Network (CAN) — This network connects two or more LANs that are limited to specific geographical area viz. college campus, office buildings, etc.
  4. Metropolitan Area Network (MAN) — This network connects two or more local area networks or campus area networks together. It prefers routers, switches and hubs but doesn't extend beyond the boundaries of the immediate town/city.
  5. Wide Area Network (WAN) — It is a digital communication system that interconnects a large number of computers in a wide area. This type of communication network can operate worldwide. In a WAN, telephone lines, microwave, satellite links, etc. can be used as transmission mediums.

Question 6

What are the advantages and disadvantages of complete topology?

Answer

Advantages

  1. It is fastest way to transfer data between two computers.
  2. If any computer breaks down, communication takes place via other modes.

Disadvantages

It is comparatively expensive as number of terminals/points connected to a computer are more.

Question 7

What is 'Cloud Computing'? What are its characteristics?

Answer

Cloud computing means storing, accessing information over the Internet other than hard drive of your system. Characteristics of cloud computing are:

  1. The user is able to access the information at any time by logging on to the Internet.
  2. Information is easily accessible from any place or any location.
  3. It provides instant monitoring of the resources accessed by the users.
  4. It allows multiple resource sharing.
  5. It is self-service where you can compute or store the information without human interaction.

Question 8

What are the advantages of Cloud Computing? Explain.

Answer

The advantages of Cloud Computing are:

  1. It eliminates the difficulty and expense of maintaining, upgrading computer hardware and software.
  2. The processing speed, memory capacity, software applications and maintenance of a computer system are minimized.
  3. It does not require any software to access or manipulate any information.
  4. You can store and access any size or type of file, word process, play games or videos.
  5. You can also develop applications or make scientific calculations or anything you want by simply using a smart phone.
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