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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...

A Communication Subnetwork ( Subnet ) is a typical subpart of a Network. The Subnetwork Computers are of high capacity. The subnetwork activities are carefully monitored. Advanced Computers are used as nodes. These are called Hosts. Such Computers are interconnected with communication links forming a Communication Subnetwork.  Subnetwork Computers have high speed and large storage. Such Computers may have additional processors, besides the main processing unit. The data to be processed may be of complex nature. The size of data handled here is large. Intensive operations are performed to process data. It must be said that Advanced Processors are of much use here. Inflow of data to the Communication Subnetwork from outside causes the size of data to be large. Data from outside  has to be handled by the Subnetwork. The memory capacity of Subnetwork Computers is well suited for large size data. Subnetwork links may distribute the inflow of data to several Subnetwork Computers. Th...

A Host Computer is a part of Network structure. It is a computer that is very resource rich.  It is used in organisations. Organisations store application programs and important information in Hosts. These application programs are used to serve the meaningful goals of an organisation.  Computers based Network Architecture is suitable for Host Computers. As part of a Network, Host gives a great performance. Many small Computers access the Host Computer. Host Computer takes care of the requirements of small Computers. The Host and dependent  small Computers are part of a Network. The speed at which Hosts work is great. Besides, they have to carry out large amounts of data processing. The size of data handled by Hosts is large. Data comes from many small Computers. Small Computers submit data in small amounts. So, collectively combining these small amounts the size of data becomes large for the Host.  Problems that cannot be solved by small Computers are sent to the Hos...