Answer the following questions.

a.What do you mean by communication?

Ans. Communication means receiving or sending information between two or more than two persons. Communication can be one direction or both.

b. What do you mean by telecommunication? Give any 3 examples.

Ans. Interchanging the message such as text, audio, video, etc. through electronic media in the form of electric signals is called telecommunication. Newspaper, video chat, radio are the 3 examples.  

c. What are the components of data communication?

Ans. The components are sender, receiver , protocol, data and medium.

d. what do you mean by modes of transmission?What are they?explain.

Ans. The direction of communication from sender to receiver and vice versa is called the modes of transmission. Its types are 1) simplex mode 
Simplex mode communication is a mode of transmission in which data flows in only one direction only i.e. sender to receiver only. For eg; radio broadcasting, TV, etc.
2) Half Duplex mode
It is a mode of transmission in which data flows in both directions , but only in one direction at a time i.e. sender to receiver and vice versa but not at the same time. For eg walkie talkie 3)Full duplex mode : Full duplex communication is a mode of transmission in which data is both the directions simultaneously on the same channel i.e. sender to reciever and vice versa at the same time. for example video chat.

e. What do you mean by bandwidth? Explain their types.
Ans. Network bandwidth is the capacity of a wired or wireless network communications link to transmit the  maximum amount of data from one point to another over a computer network or internet connection  in a given amount of time usually per second.  Its types are
1. Narrow  band channel
It is used where data volume is relatively slow and which transmits data at a rate btwn 40 to 100 bits per second.
2. Voice band channel
– handle moderate data volume
– transmission rate is btwn 110 to 9600 bps.
3. Broadband channel
– high sped, high capacity transmission medium that carry signals from multiple independent network carriers.

f. What do you mean by computer network?
Ans. When 2 or more than 2 computers are interconnected to interchange the data and change the resources it is called computer network.
g. What  are the types of computer network according to area coverage? What are they?
Ans. According to area coverage there are 3 types of computer network. They are Local Area Network (LAN) ,Metropolitan area network (MAN) , Wide Area Network (WAN).

h. What are the types of computer network according to architectures ? What are they?
ANS. There are 3 types of network architectures , they are peer to peer network , client server network and centralized network.

i.  What do you mean by communication media ? Write types.
 ANS. Communication media is the path through which communication data travel . Its types are guided media(wired media) and unguided media(unbounded media)

J. what are the guided media? List them.
Ans. The wired media is called guided media. They are also called bounded media. Its types are
1)twisted pair 2) coaxial cable 3) optical fiber

k. What are the unguided media? List them.
Ans. The wireless communication media is called unguided or unbounded media. Its types are
 1. radio waves 2. micro waves 3. infrared waves

l. What are the elements of network?
Ans. The elements of network are NIC card, hub, modem, bridge, switch, router, gateway.

m. what is the function of NIC  card?
Ans. The function of NIC card are
1) converts the parallel data of the computer bus into serial data for the network
2)makes the physical connection between the computer and the network 3) connects computers connected within LAN as well as large scale network through internet protocol

n. What are the connectors? How many types of connectors you know? Write them.
Ans. Connector is a part of cable that plugs into a port or interface to connect one device to another. The types are RJ45(Registered Jack 45), BNC, ST, etc.

o. What is the full form of hub? ans. Hub is name of a device and has no full form.

r. What do you mean by topology? How many types of topology are there?
Ans. A network topology is the physical arrangement, or patterns in which all nodes on a computer are connected together. There are many types of topologies such as bus topology, star, ring, three and mesh topologies.

s. Write any 4 advantages and disadvantages of computer network?
Ans. The advantages are 1) Sharing the resources 2) enhanced communication 3) cheap communication 4)easy update
   The disadvantages of computer network are as 1)security problem 2) expensive 3) Misleading the society 4)  maintenance

 t. What is intranet?
Ans. Intranet is a local or restricted communication network , usually a private network created using World Wide Web software.
u. Is there any possibility of wide area network without satellite? Ans.

      4. Write full form of the following

STP- Shielded Twisted Pair

EMI- Electromagnetic Interference

UTP- Unshielded Twisted  Pair

BNC- British Naval Connector

VSAT-Very Small Aperture Terminal

IDU-Indoor    Unit

NIC-Network Interface Card

LAN-Local Area Network

RJ45-Registered Jack 45

ST-Straight Tip

USB-Universal Serial Bus

FC-Fiber Cable

FJ- Fiber Jack

MAC-Media Access Control

WAN-Wide Area Network

NOS-Network Operating System

TCP-Transmission Control Protocol

HTTP-Hypertext Transfer Protocol

SMTP-Simple Mail Transfer Protocol

ARP-Address Resolution Protocol

FTP-File Transfer Protocol

POP-Post Office Protocol

PPP-Point -To-Protocol

CDP-Cisco Discovery Protocol

6.Match the following.

a)Node =========any devices connected to network
b)client ========= a self sufficient computer can run without  help of server computer
c) peer=========no server, no clients all are equal

5. Choose the best answer.

a. Communication can be one direction or two.    i. one direction   ii. 2 direction     iii. 1 direction or 2      iv. Three direction

b. Newspaper communication is unidirectional directional.       i. unidirectional            ii. Bi- directional   iii. Multidirectional        iv. Not of above

c. The wired media are called All of above media.   i. guided   ii. Bounded   iii. closed    iv. All of above

d. Unshielded twisted pair is a bounded media without having a shielded foil i. metallic wire ii. Shielded foil iii. Transmitting capacity   iv. signal     

e. As the wavelength of microwaves are long, they have short frequency.
  i. no   ii. good    iii. Short       iv. long

f. Infrared waves cannot penetrate through walls of the house or obstacles.
i. infrared waves      ii. Radio waves    iii. Both i and ii
iv.  none of above


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