L11 - The Data Link Layer Functions: Grouping bits into...

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The Data Link Layer Functions: Grouping bits into frames as an interface to the network layer. Handling transmission errors. Regulating flow of frames. Ensuring proper sequencing of frames.
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Link layer takes into its payload field whatever higher layers give it.
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Link Layer Options Unacknowledged connectionless service - Data sent over link one frame at a time, no link layer acknowledgment. Acknowledged connectionless service - Data is acknowledged on the link one frame at a time with no regard to other frames. Following departs from text : Acknowledged service that delivers frames reliably, in the order received.
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Link ordered reliable delivery : Successive frames might actually come from different users with different network connections. A and B sharing a link: By assuring link delivers frames reliably and in order to the higher network layer at Y, the sets of network layer packets can be sorted out and remain in their own correct orders. Putting two unrelated network packets into one link frame, as illustrated, is unusual, but could be done.
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Framing - breaking a bit stream into frames. The first task is to define the start and
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This note was uploaded on 09/23/2009 for the course CMPEN 362 taught by Professor Johnmetzner during the Spring '09 term at Pennsylvania State University, University Park.

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L11 - The Data Link Layer Functions: Grouping bits into...

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