cnp3-ebook/exercises/reliability

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2 ../../exercises/reliability.rst:11
	English Open questions
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4 ../../exercises/reliability.rst:16
	English Transmission links have sometimes different upstream and downstream bandwidths. A typical example are access networks that use ADSL (Asymmetric Digital Subscriber Lines). Consider two hosts connected via an ADSL link having an upstream bandwidth of 1 Mbps and a downstream bandwidth of 50 Mbps. The propagation delay between the two hosts is 10 milliseconds. What is the maximum throughput, expressed in frames/second, that the alternating bit protocol can obtain on this link if each data frame has a length of 125 bytes and acknowledgments are 25 bytes long. Same question if the protocol is modified to support 1500 bytes long data frames.
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5 ../../exercises/reliability.rst:19
	English How would you set the duration of the retransmission timer in the alternating bit protocol ?
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6 ../../exercises/reliability.rst:22
	English A version of the Alternating Bit Protocol supporting variable length frames uses a header that contains the following fields :
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7 ../../exercises/reliability.rst:24
	English a `number` (0 or 1)
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	English a `length` field that indicates the length of the data
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9 ../../exercises/reliability.rst:26
	English a Cyclic Redundancy Check (`CRC`)
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11 ../../exercises/reliability.rst:30
	English Derive a mathematical expression that provides the `goodput`, i.e. the amount of payload bytes that have been transmitted during a period of time, achieved by the Alternating Bit Protocol assuming that :
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12 ../../exercises/reliability.rst:32
	English Each frame contains `D` bytes of data and `c` bytes of control information
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	English Each acknowledgment contains `c` bytes of control information
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14 ../../exercises/reliability.rst:34
	English The bandwidth of the two directions of the link is set to `B` bits per second
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15 ../../exercises/reliability.rst:35
	English The delay between the two hosts is `s` seconds in both directions
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16 ../../exercises/reliability.rst:36
	English there are no transmission errors
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18 ../../exercises/reliability.rst:40
	English when there are no losses
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20 ../../exercises/reliability.rst:42
	English when every second acknowledgment is discarded due to transmission errors
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21 ../../exercises/reliability.rst:44
	English Same question when using selective repeat instead of go-back-n. Note that the answer is not necessarily the same.
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22 ../../exercises/reliability.rst:50
	English Practice
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23 ../../exercises/reliability.rst:52
	English Reliable protocols depend on error detection algorithms to detect transmission errors. The following questions will reinforce your understanding of these algorithms.
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24 ../../exercises/reliability.rst:54
	English Reliable protocols rely on different types of checksums to verify whether frames have been affected by transmission errors. The most frequently used checksums are :
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25 ../../exercises/reliability.rst:56
	English the Internet checksum used by UDP, TCP and other Internet protocols which is defined in :rfc:`1071` and implemented in various libraries.
	Czech 0/1370 · 137 Needs editing

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