Skip to main content

Network Service

A Network carries information. Information is transmitted by a transmitter. A Computer may be a transmitter of information. The transmitted information is carried over a Network of Communication lines. Such Network helps to carry information. The information is carried to far end. At the far end the information is received by a receiver.

Network is meant to provide service. Service can be measured in terms of number of beneficiaries. The extent of service leads to Network Service classification as:

  1. UNICAST 

  2. MULTICAST

  3. BROADCAST

                          ( 1  )

When Network transmission has to reach only one recipient, the transmitted information is UNICAST (UNI  + CAST =  ONE + TO DIRECT = TO  DIRECT TOWARDS ONE ). Actually, the information is addressed in such a way that only one recipient can uncover the sent information. This is the UNICAST service of a Network where only one recipient benefits.

UNICASTING means putting out information for a single recipient. Not more than one recipient can receive the information that has been UNICAST. It is felt that UNICAST may be important for security establishments.

A UNICAST information is meant for a single audience. Such cast information may be sensitive. It ensures privacy.


                         ( 2 )

In MULTICAST ( MULTI  + CAST = MANY + TO DIRECT = TO DIRECT TOWARDS MANY ) service there are many recipients of information. It must be noted that not everyone is the recipient of MULTICAST information. A selected group of recipients is formed before transmission. In this MULTICAST service only the selected group can benefit from transmission of information.

We can say that in MULTICASTING service, the beneficiaries of information are decided in advance. 


                         ( 3 )

BROADCAST ( BROAD + CAST = EVERYONE IN THE RANGE + TO DIRECT = TO DIRECT EVERYONE IN THE RANGE )

BROADCAST information is available for everyone in the range. A BROADCASTING service sends out information for every possible recipient. In terms of reach, it is the  Network service with maximum recipients. If one is interested in BROADCAST transmission, one can be the BROADCAST beneficiary. If one is not interested in the BROADCAST information, he may simply ignore the information.

Labels:

Comments

Post a Comment

Popular posts from this blog

Interface Message Processor ( IMP )

Interface Message Processor ( IMP ) is a special purpose Computer. The Processor plays a vital role in Host-to-Host communication. IMP is placed between Host Computers.  IMP helps Hosts to exchange information. IMPs ( Interface Message Processors ) form a group. The group dedicates itself towards reliable transmission of Packets. _________________________ Note: An Interface Message Processor can be supposed to have a face. Firstly this supposed face of IMP is in the direction of the first Host, which sends the  message. Secondly, this face is turned towards the other Host.  Now, the IMP,  with its face turned around, communicates with this other Host.  Transformed message from IMP is communicated to this Host. __________________________ Message ( a piece of information ) sent from the Host ( source of information  ) is transformed into Packets. Transformation of the message into Packets is performed by an IMP. These Packets are forwarded to the receiver H...
Post a Comment
Read more

Understanding Distribution

Distributed presence means that more than one object is there. Also, these objects are situated at more than one location.  One object may establish communication with another object. The first object may deliver some message. The message can be received by another object. It can be said that object distribution is successful, as one object has succeeded in delivering a message. The second object has successfully received the message. Two objects are at a distance. Communication brings them closer. The successful communication has served to highlight that the idea of distribution is meaningful. Distribution helps exchange of information. Many different objects can form a group.  Two groups can occupy different locations.  It may happen that at a particular location there are several objects. But, all these objects talk among themselves.They talk among themselves and make things happen.  There is a resultant of this talk process. All the communicating objects  at...
Post a Comment
Read more

Message Switching

Message is a piece of information. Switching means movement.  In a Network there are a number of nodes. Nodes are vital junctions of a Network. Message Switching means transmission from one node ( one point ) of a Network to another node ( another point ). So, transmission is from point to point. Transmission from one point to another point is a single hop ( jump ). Message Switching means switch over of a Message. In one step of Message Switching,  Message switches over from one node to another.  The two nodes involved in a Switching operation are on the same Network. It cannot be that the beginning node ( source node) is on one Network and the second node ( sink node ) is on a different Network. In a point to point ( one junction to another junction ) transmission, a Message travels a part of its journey. Message moves from previous point to next point. The Network is Point-to-Point Network. A Switching activity means movement of a message. Indeed, the Message has mov...
Post a Comment
Read more