13-09-2017, 11:03 AM
It addresses some concepts and fundamental terms used in the evolutionary language of internetworking. In the same way that this book provides a basis for understanding modern networks, this chapter summarizes some common themes presented in the rest of this book. Topics include flow control, error checking, and multiplexing, but this chapter focuses mainly on assigning the open system interconnect (OSI) model to network / interconnect functions and summarizing the general nature of addressing schemes within of the context of the OSI model.
Connection-oriented services
There is a sequence of operations that should be followed by users of the connection-oriented service. These are :
1. The connection is established
2. Information is sent
3. The connection is released
In the connection-oriented service, you have to establish a connection before you start communication. When the connection is established, we send the message or information and then release the connection.
Connection-oriented service is more reliable than the offline service. We can send the message in connection-oriented service if there is an error at the end of the receivers. Connection oriented example is the Transmission Control Protocol (TCP).
Less Services Connection
It is similar to postal services, since it carries the complete address where the message (letter) should be carried. Each message is routed regardless of the source to the destination. The order of the message sent may be different from the order received.
In connection, the data is transferred in an address from the source to the destination without checking whether the destination is still there or not, or if it is ready to accept the message. Authentication is not required in this. Example of offline service is the User Datagram Protocol (UDP).
Connection-oriented services
There is a sequence of operations that should be followed by users of the connection-oriented service. These are :
1. The connection is established
2. Information is sent
3. The connection is released
In the connection-oriented service, you have to establish a connection before you start communication. When the connection is established, we send the message or information and then release the connection.
Connection-oriented service is more reliable than the offline service. We can send the message in connection-oriented service if there is an error at the end of the receivers. Connection oriented example is the Transmission Control Protocol (TCP).
Less Services Connection
It is similar to postal services, since it carries the complete address where the message (letter) should be carried. Each message is routed regardless of the source to the destination. The order of the message sent may be different from the order received.
In connection, the data is transferred in an address from the source to the destination without checking whether the destination is still there or not, or if it is ready to accept the message. Authentication is not required in this. Example of offline service is the User Datagram Protocol (UDP).