# SOME DESCRIPTIVE TITLE. # Copyright (C) 2019 Olivier Bonaventure # This file is distributed under the same license as the Computer networking # : Principles, Protocols and Practice package. # FIRST AUTHOR , 2019. # #, fuzzy msgid "" msgstr "" "Project-Id-Version: Computer networking : Principles, Protocols and " "Practice 3\n" "Report-Msgid-Bugs-To: \n" "POT-Creation-Date: 2019-10-09 12:39+0000\n" "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n" "Last-Translator: FULL NAME \n" "Language-Team: LANGUAGE \n" "MIME-Version: 1.0\n" "Content-Type: text/plain; charset=utf-8\n" "Content-Transfer-Encoding: 8bit\n" "Generated-By: Babel 2.7.0\n" #: ../../exercises/transport.rst:7 msgid "Serving applications" msgstr "" #: ../../exercises/transport.rst:10 msgid "" "This is an unpolished draft of the third edition of this e-book. If you " "find any error or have suggestions to improve the text, please create an " "issue via https://github.com/CNP3/ebook/issues?milestone=3 or help us by " "providing pull requests to close the existing issues." msgstr "" #: ../../exercises/transport.rst:14 msgid "Open questions" msgstr "" #: ../../exercises/transport.rst:16 msgid "" "Which mechanisms that should be included in a transport protocol that " "provides an unreliable connectionless transport service that can detect " "transmission errors but not correct them ?" msgstr "" #: ../../exercises/transport.rst:18 msgid "" "A reliable connection oriented transport places a 32 bits sequence number" " inside the segment header to number the segments. This sequence number " "is incremented for each data segment. The connection starts as shown in " "the figure below :" msgstr "" #: ../../exercises/transport.rst:38 msgid "" "Continue the connection so that `Host B` sends `Hello` as data and `Host " "A` replies by sending `Pleased to meet you`. After having received the " "response, `Host B` closes the connection gracefully and `Host A` does the" " same. Discuss on the state that needs to be maintained inside each host." msgstr "" #: ../../exercises/transport.rst:40 msgid "" "A transport connection that provides a message-mode service has been " "active for some time and all data has been exchanged and acknowledged in " "both directions. As in the exercise above, the sequence number is " "incremented after the transmission of each segment. At this time, `Host " "A` sends two DATA segments as shown in the figure below." msgstr "" #: ../../exercises/transport.rst:57 msgid "" "What are the acknowledgments sent by `Host B`. How does `Host A` react " "and how does it terminate the connection ?" msgstr "" #: ../../exercises/transport.rst:60 msgid "" "Consider a reliable connection-oriented transport protocol that provides " "the bytestream service. In this transport protocol, the sequence number " "that is placed inside each DATA segment reflects the position of the " "bytes in the bytestream. Considering the connection shown below, provide " "the DATA segments that are sent by `Host A` in response to the " "`DATA.request`, assuming that one segment is sent for each " "`DATA.request`." msgstr "" #: ../../exercises/transport.rst:86 msgid "" "Same question as above, but consider now that the transport protocol " "tries to send large DATA segments whenever possible. For this exercise, " "we consider that a DATA segment can contain up to 8 bytes of data in the " "payload. Do not forget to show the acknowledgments in your answer." msgstr "" #: ../../exercises/transport.rst:88 msgid "" "Consider a transport protocol that provides a reliable connection-" "oriented bytestream service. You observe the segments sent by a host that" " uses this protocol. Does the time-sequence diagram below reflects a " "valid implementation of this protocol ? Justify your answer." msgstr "" #: ../../exercises/transport.rst:105 msgid "" "In the above example, the two `DATA` segments were lost before arriving " "at the destination. Discuss the following scenario and explain how the " "receiver should react to the reception of the last `DATA` segment." msgstr "" #: ../../exercises/transport.rst:122 msgid "" "A network layer service guarantees that a packet will never live during " "more than 100 seconds inside the network. Consider a reliable connection-" "oriented transport protocol that places a 32 bits sequence number inside " "each segment. What is the maximum rate (in segments per second) at which " "is should sent data segments to prevent having two segments with the same" " sequence number inside the network ?" msgstr "" #: ../../exercises/transport.rst:126 msgid "Practice" msgstr "" #: ../../exercises/transport.rst:128 msgid "" "Amazon provides the `S3 storage service `_ " "where companies and researchers can store lots of information and perform" " computations on the stored information. Amazon allows users to send " "files through the Internet, but also by sending hard-disks. Assume that a" " 1 Terabyte hard-disk can be delivered within 24 hours to Amazon by " "courier service. What is the minimum bandwidth required to match the " "bandwidth of this courier service ?" msgstr "" #: ../../exercises/transport.rst:135 msgid "Discussion questions" msgstr "" #: ../../exercises/transport.rst:137 msgid "" "In the transport layer, the receive window advertised by a receiver can " "vary during the lifetime of the connection. What are the causes for these" " variations ?" msgstr "" #: ../../exercises/transport.rst:139 msgid "" "A reliable connection-oriented protocol can provide a message-mode " "service or a byte stream service. Which of the following usages of the " "sequence numbers is the best suited for each of these services ?" msgstr "" #: ../../exercises/transport.rst:141 msgid "" "DATA segments contain a sequence number that is incremented for each byte" " transmitted" msgstr "" #: ../../exercises/transport.rst:142 msgid "" "DATA segments contain a sequence number that is incremented for each DATA" " segment transmitted" msgstr "" #: ../../exercises/transport.rst:144 msgid "" "Some transport protocols use 32 bits sequence numbers while others use 64" " bits sequence number. What are the advantages and drawbacks of each " "approach ?" msgstr "" #: ../../exercises/transport.rst:146 msgid "" "Consider a transport protocol that provides the bytestream service and " "uses 32 bits sequence number to represent the position of the first byte " "of the payload of DATA segments in the bytestream. How would you modify " "this protocol so that it can provide a message-mode service ? Consider " "first short messages that always fit inside a single segment. In a second" " step, discuss how you could support messages of unlimited size." msgstr "" #: ../../exercises/transport.rst:148 msgid "What is piggybacking and what are the benefits of this technique ?" msgstr "" #: ../../exercises/transport.rst:155 msgid "Footnotes" msgstr ""