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Netzwerktechnik 2 (Fach) / Chapter 3 (Lektion)
- What are the main three parts of a frame? HeaderDataTrailer
- What is the main function of the frame trailer? error control
- What is framing? Name some framing methods! Framing:a function of the data link layer. It provides a way for a sender to transmit a set of bits that are meaningful to the receiver.Character countFlag bytes with byte stuffingStarting and Ending flags with bit stuffingPhysical layer coding violations
- What is the main type of error control used in frames today? Where is it found (in the frame) ? Error detectionError correctionit is found through encoding rules:CRC (Cyclic Redundancy Check)
- What is the mathematical basis of the CRC? How does a computer calculate it? basis:binary polynomialscalculation:CRC calculations using logic gates and bit shifting
- What does ARQ stand for and why is it used? ARQ = Automatic Repeat Requestused because:to ensure the information is delivered without duplication
- Name some different forms of ARQ. Stop-And-WaitGo-Back-NSelective-Repeat
- What is ARQ used for? error detectionflow control
- Name two main techniques used for flow control. Dedicated Stop and Go messagesAdaptive windows
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