Chapter 5: The Link Layer and Local Area Networks
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Layer functionality
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primary functionality: move data across a single link
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possible problems
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noise
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contention for link
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node data handling limits
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possible services
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framing
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error handling
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controlling link access
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flow control
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Link types
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point-to-point
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broadcast/shared
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distinction between logical and physical type
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Error detection/correction
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general strategy
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error detection code schemes
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parity bit
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two dimensional parity
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cyclic redundancy codes
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Multiple access protocols
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channel partitioning (TDM, FDM)
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random access
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use of carrier sense and collision detection
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Aloha
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taking turns
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Ethernet
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Link layer addressing
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MAC addresses
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Address resolution protocol
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Ethernet and local area networks
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physical and logical topology of an Ethernet segment
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LAN organization
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hubs (physical layer)
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switches (link layer)
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routers (network layer)
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drawbacks of hubs
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Point-to-point protocol (telephone modems)
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Link virtualization
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ATM and telecommunications
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ATM links in the internet