(X) Ans of Ch-1 Exercise
Select the best answer for the following:
Which is not a network protocol? LAN
Which is not a network operating system? MSDOS
Which is the component of a network? Hub
Which is the connector of coaxial cable? BNC
An example of guided media Fiber Optics
Which one is an appropriate network within a building? LAN
The device used for connecting computer to a telephone is called Modem
Which one is used to connect the dissimilar networks? Gateway
An example of unguided communication media Both of them
TV broadcasting is an example for data transmitting Simplex Mode
Fill in the blanks:
Telecommunication is a system of transmission of sounds, images, texts or data in the form of electronic signals.
Modes for transmitting data from one device to another are Simplex, Half duplex and Full duplex.
Bandwidth is measured in bps (bits per second).
Cat 5 cable is used with RJ45 connector.
Microwave is a wireless technology that can be used to transmit data between two different computers.
MODEM is short form of modulator - demodulator.
Linux is an example of network operating system.
Peer to peer network is group of computers, which acts as server and workstation.
State whether the following statements are true or false:
Protocols are not required to exchange data between two different computers. FALSE
Full duplex mode allows simultaneous transmission of data in both directions. TRUE
Wire communication is suitable for local area network. TRUE
The router filters and forwards information among different networks. TRUE
In a computer network the data is passed from one computer to another by means by cables or satellites. TRUE
A metropolitan area network (MAN) is a network of computers between two different cities. TRUE
The computer in a network system share only software packages. FALSE
Connecting computers between two different countries is an example of WAN. TRUE
Give the full forms of the following:
WAN = Wide Area Network
MAN = Metropolitan Area Network
UTP = Unshielded Twisted pair
STP = Shielded Twisted Pair
POP = Post Office Protocol
NIC = Network Interface Card
HTTP = Hypertext Transfer Protocol
MODEM = Modulator Demodulator
SMA = Screw Mounted Adaptors
BNC = British Naval Connector
Match the following:
Answer the following questions:
Define data communication. What are the components of data communication?
ANSWER:
The collection of hardware, software and other devices that allows to exchange data, information and voice between two or more devices through a wire or radio waves is called data communication.
The Components of data communication are as follows:
Data
Sender
Medium
Receiver
Protocol
Differentiate between simplex and half-duplex modes in communication.
ANSWER:
Differentiate between bridge and router.
ANSWER:
Define a computer network. Write any three advantages of it.
ANSWER:
Two or more computers connected to each other to share data, hardware, software and other resources is called computer network.
Any three advantages of computer network are as follows:
Communication made by a computer network is much cheaper.
It makes communication very fast because information can be exchanged rapidly in computer network.
Data in a network environment can be updated from any computer. Updated data can be accessed by all the computers of the network.
What are the three models of the network? Write about the client/server model of a network.
ANSWER:
Three models of the network are as follows:
Centralized Computing Network
Client - Server Network
Peer - to - Peer Network
Client - Server Network
The client - server network consists of at least one server and one or more clients or workstations, where users do their work. The server is the main computer, which gives services to the workstations. It stores and protects user files and the security of the entire network. In this network, the user needs to be logged into the server to enjoy the rights and access the resources of the network according to the rights provided by the administrator.
What is a protocol? Write the names of common protocols of a network.
ANSWER:
Sets of rules that the computers on the network must follow to communicate and to exchange data with each other is called protocol.
Common protocols of a network are :
TCP/IP , ARP , HTTP , FTP , SMTP , POP , PPP , CDP
What is a NIC? Write its role in the computer network.
ANSWER:
A hardware device that acts as an interface through which a computer is connected to a network is called Network Interface Card (NIC) . Each NIC is assigned a unique MAC (Media Access Control) address by the manufacturer.
The role of NIC in a computer network is to convert data into electrical signals and transfer them through cables and vice - versa.
Define topology. Write about the star topology.
ANSWER:
The arrangement or connections patterns of computers or nodes and other devices of the network is called topology. Speed and performance of the computer network depends upon the topology used.
Star Topology
In star topology, all computers or networks devices are connected through a central device called a hub or switch. The computers are connected to the hub or switch using unshielded twisted pair, shielded twisted pair or fiber optic cable. This is the most popular network topology used to connect computers and other devices in a network. In this topology , the central point device (hub or switch) may regenerate the signal, which helps to transfer data to a longer distance.
Write any two advantages and disadvantages of bus topology.
ANSWER:
Advantages of Bus Topology:
It is easy to set up computers and other devices in bus topology, because all the devices are connected through a single wire.
It requires fewer cable media, so it is cheaper than other topologies.
Disadvantages of Bus Topology:
The whole network system collapses if the cable or backbone is damaged.
It is difficult to detect the errors in this network.
Define LAN, MAN and WAN.
ANSWER:
LAN (Local Area Network)
A network of computers that are relatively near to each other and are connected in a way that enables them to communicate by cable and a small wireless device is called LAN (Local Area Network).
MAN (Metropolitan Area Network)
A network of computers which is spread over a metropolitan area such as within a city and connects two or more LAN together is called MAN(Metropolitan Area Network).
WAN(Wide Area Network)
A network system of connecting two or more computers generally across a wide geographical area such as cities, districts, and countries is called WAN(Wide Area Network).
Differentiate between LAN and WAN.
ANSWER:
Write the advantages and disadvantages of star topology.
ANSWER:
Advantages of Star Topology:
It is easy to set up and configure.
Failures of a single computer or cable does not affect the entire network.
Disadvantages of Star Topology:
It requires more cable in comparison to bus topology. So , it is costlier.
Failures of the central device (switch or hub) break down the whole system.
n) Differentiate between peer to peer and client server network.
Answer:
Write short notes on the following:
MODEM
ANSWER:
MODEM is the short form of Modulator-Demodulator. This is a device used to transfer the data of one computer to another using telephone lines. During the modulation phase , it is used to translate digital signals of a computer to analog signals, which are then transmitted across the standard telephone lines. The reverse takes place during its demodulation phase, as the MODEM receives analog signals from a phone line and converts them into digital signals for the computer. Two common types of MODEM are Internal and External MODEM.
Repeater
ANSWER:
The signals transmitted become weak due to some problems in the transmission mediums or the distance between the two locations. A repeater is a device that amplifies the incoming signals, creates a new copy of it and transmits the signals on the network. Repeaters are required in the network where computers are a part of each other.
Hub
ANSWER:
A hub is a device with multiple points or ports. It acts as a central point from where different computers and other devices are connected. It also amplifies the signals and sends them to all connected devices. The hub is mostly used in the physical star topology.
Bus Topology
ANSWER:
In bus topology, computers and other devices are arranged in a linear format. It uses a common backbone or wire to connect all the computers and devices. The backbone is also called Bus. It works as a communication medium and each workstation is connected with the coaxial cable and ‘T’ connector. Data is transmitted on the network through the backbone using the computer destination address. If the address matches with the workstation’s address, it receives the data . If the address does not match, the data passes to the next workstations and so on.
Ring Topology
ANSWER:
In ring topology computers are connected in the shape of a circle without any end point. Each workstation contains two neighbours for communication or an input and an output connection. The input connection of the workstation receives data which are transmitted to the next workstation through the output connection. So, in this topology , the signal travels in a circle passing through each computer on the network because there are no terminated ends to the cables. It supports coaxial , twisted pair and fiber optics cable.
Write the technical terms for the following:
Sending or receiving information between two or more persons.
Communication
A system of transmission of sounds, images, texts, or data in the form of electronic signals.
Telecommunication
The path through which the sender makes communication to the receiver.
Medium
Data can be transmitted in both directions but only one direction at a time
Half - duplex mode
Mode of transmission that transmits the data simultaneously in both directions
Full - duplex mode
Terms used to describe the data handling capacity of a communication system
Bandwidth
Cable lines through which data flows in a specified path
Guided or Bounded Media
The data or signals transmitted through the air in the communication
Unguided or Unbounded or Wireless Media
Two or more computers connected with each other to share data and other resources
Computer Network
The arrangement or connections patterns of computers or nodes and other devices of the network
Network Topology
Interface between the NIC of the computer and the cable that passes data from one computer to another computer
Connectors
A device that amplifies the incoming signals, created a new copy of it and transmits the signals on the network
Repeater
An intelligent device that connects two different networks
Router
An intelligent device used to transfer the data of one computer to another using a telephone line
Modem
Set of rules that the computers on the network must follow to communicate and to exchange data with each other
Protocols
A device which connects two dissimilar networks
Gateway
***** END OF CHAPTER - 1 *****
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