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Two distinct techniques are used in data communications to transfer data. Each has its own advantages and disadvantages. They are the connection-oriented method and the connectionless method:

  • Connection-oriented Requires a session connection (analogous to a phone call) be established before any data can be sent. This method is often called a "reliable" network service. It can guarantee that data will arrive in the same order. Connection-oriented services set up virtual links between end systems through a network, as shown in Figure 1. Note that the packet on the left is assigned the virtual circuit number 01. As it moves through the network, routers quickly send it through virtual circuit 01.
  • Connectionless Does not require a session connection between sender and receiver. The sender simply starts sending packets (called datagrams) to the destination. This service does not have the reliability of the connection-oriented method, but it is useful for periodic burst transfers. Neither system must maintain state information for the systems that they send transmission to or receive transmission from. A connectionless network provides minimal services.
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The IEEE subdivided the datalink layer to provide for environments that need connectionless or connection-oriented services What are the two layers called?

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What are connection-oriented services?

Connection-oriented service requires as session connection be established before any data can be sent with a direct physical connection between the sessions. This often considered to be a more reliable network service than the alternative, connectionless service. Fore more information you can visit website:http://www.iyogibusiness.com


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-Unacknowledged connectionless service consists of having the source machine send independent frames to the destination machine without having the destination machine acknowledged. Most LAN's use this service. -Acknowledged connectionless service in this service there are no logical connections used but each frame sent individually acknowledged. In this way the sender knows whether a frame has arrived correctly. It is useful on wireless systems.


What connection services does not involve flow error or packet sequence control?

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They allow stations to reserve resources during the establishment of connections


What are the types of services provided by LLC layer?

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application presentation session **transport network The transport layer of the osi model


Where can I get services oriented architecture?

You can do a search for architects in your area that can offer services oriented architecture at http://www.architectsearch.org/. Another searchable site is http://www.architectsusa.com/