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[answered] 1) Consider a data link with capacity 1 Mbit/s and propagat


1) Consider a data link with capacity 1 Mbit/s and propagation delay 1ms. Measurements of this link show that the following errors occur, on average, at the following rates: . Single bit flip: once every 10 minutes . Two consecutive bits flip: once every 100 minutes . Burst of 100 consecutive bit flips: once every 1000 minutes Assume the maximum frame size for messages on this link is 1000 Bytes, and the minimum data link header/trailer occupies 30 Bytes, including a frame checksum that can reliably detect message errors. Suppose you consider implementing two different approaches to handling data link errors: . A data link layer error correction code that can, in addition to detect errors as above, correct exactly one single bit error. This code requires an additional 20 Bytes in the trailer. . A parity-based scheme where the data link layer buffers up to 10 packets and send a parity frame with a batch of 10 frames. This approach requires an additional 2 bytes in the header to hold a frame identifier. 1a) [10] Estimate the best-case throughput that can be achieved for transferring large files over this link under both schemes. Assume the total size used by end-to-end and network layer header/trailers is 40 Bytes, and that the file transfer end-to-end protocol requests the retransmission of a frame when an error is detected. State your assumptions whenever applicable and justify your work for partial credit.
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