Network Components

Components of Network & Components of computer Network

Before we start disscussing the components  of a computer networks, let us first visualize two persons talking to one another When two persons talk to one another, one speaks and the other listens. The one who is speaking is the sender of information, and the one who is listening is the receiver of the information.And one other, have you ever wondered that how does the voice orginating from sender's mouth reach the ears of receiver's? This is because, the air present there carries the sound from sender to receiver's. Therefore, the communication channel is air. ( Find out, can the same happen in a vacuum?).

Thus, we see that two persons are talking to another in person, there are 3 components playing their roles in this:
1. The Sender
2. Communication
3.The Receiver

Let us now talk of a conversation, which is slightly different from the above discussed conversation. Let us talk about two persons conversing on phone.

Sender-(Telephone)------ telephones cables------ Receiver (receiver communication equipment (telephone))

Components in this network

a. Sender 
b. Communication Equipment 
c. Communication channel (telephone cables)
d. Communication Equipment at Receiver's end telephone 
e. Receiver

As you can observe from above details
a.Sender speaks through a comunication equipment, which is telephone, at his end
b. The telephone converts the sender's voice into a signal which is carried through the telephone cables to the receiver's end.
c.At receiver's end, the signal reaches to the  communication equipments, telephone, which converts the signal back to voice form
d. The receiver now listens to this voice through the telephone at his end.

Thus, we see that when two persons are talking to one another over phone, there are 5 components .
a. The sender 
b. Communication Equipment at sender's  end
c.  Communication channel- the telephone cables.
d.  Communication Equipment at the  Receiver's end- telephone here
e. The receiver

Components of a computer network

Now you can understand the components of a computer network easily as they are similiar to the one's mentioned above. Since a network refers to  interlinked devices, a computer network is the network that means interlinked computers. Computers may be interconnect directly also with the help of wires.In such a network, there would be three components playing their. 1. the sender computer 2. the communication channel 3.the receiver computer.
Computer can also be connected via telephone so that telephone lines can work as communication channel for them. When computers are connected via telephones, an additional equipment called modem is used. This is because the data signal generated by computers (digital signal) is in a form which is different from the signal form that can be carried by telephone lines (analog signal). The modem converts the computers generated signal (digital signal) into a form that can be carried by telephone cables (analog signal) . 
On the receiver's end the modem first converts the received signal into computer's understandable form and then passes it to the computer.

In such a network, there are five components playing these roles.
a. Sender
b. Sender equipment
c.Communication channel (telephone cables)
d. Receiver equipment (modem)
e.Receiver computer

By communication channel of network, it is meant that the connecting cables are being talked about. The cables that connect two or more workstations are the communication channels. In LANs (local Area network i.e., very small networks) many different types of media are in use. Copper conductors in the form of twisted pair or coaxial are by far the most common. More recently, very serious consideration has been given to the use of optical fibre technology in LANs. Other media e.g., microwave transmission, infrared, telephone line etc. are also used.

Facts related this post 

Do you know that a modem at sender end gets data in digital form and converts them into analog form so that telephone cables can carry them. At receiver's end it converts back the received analog data into digital form.A digital signal is a discrete signal and a Analog signal is a continous signal.