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Table Of Contents  CertiGuide to Network+
 9  Chapter 0010:  ISO, OSI, and IEEE Standards
      9  II  Open Systems Interconnect

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Layer 3 - Network Layer
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Layer 5 - Session Layer
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Layer 4 - Transport Layer

The transport layer manages the end-to-end control and error checking between the two points. Further, it provides recovery, flow control and creating and releasing connections created with virtual circuits.

Figure 28: Layer 4 - Transport Layer

 


The transport layer makes sure that data sent from one point to another gets there without the bits getting scrambled. Depending on the type of transport-level conversation, it may (or may not!) ensure that all messages sent from point A to point B really do arrive at point B, just that any message that does arrive at point B is the message that A intended to send.


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Layer 3 - Network Layer
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Layer 5 - Session Layer
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