Exit Zen
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../../exercises/ex-sharing.rst:150
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In ALOHA, the hosts rely on acknowledgments to detect whether their frame has been received correctly by the destination. Consider a network running at 100 Mbps where the host exchange 1000 bits frames and acknowledgments of 100 bits. Draw the frames sent by hosts A and B in the figure below. Assume that a square corresponds to 10 microseconds and that the cable has a length of 2 kilometers.
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../../exercises/network.rst:94
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In this network, assume that all the link weights are set to 1. What is the paths followed by a packet sent by the router located in `Los Angeles` to reach :
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../../exercises/reliability.rst:26
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a Cyclic Redundancy Check (`CRC`)
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../../exercises/sockets.rst:107
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The `DATA` primitives are exchanged through a service access point. In the socket API, the equivalent to the service access point is the `socket`. A `socket` is a data structure which is maintained by the networking stack and is used by the application every time it needs to send or receive data through the networking stack.
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../../exercises/transport.rst:60
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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`.
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../../principles/naming.rst:25
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Each top-level domain is managed by an organization that decides how sub-domain names can be registered. Most top-level domain names use a first-come first served system, and allow anyone to register domain names, but there are some exceptions. For example, `.gov` is reserved for the US government, `.int` is reserved for international organizations and names in the `.ca` are mainly `reserved <http://en.wikipedia.org/wiki/.ca>`_ for companies or users that are present in Canada.
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../../principles/sharing.rst:36
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A third organization of a computer network is a star topology. In such networks, hosts have a single physical interface and there is one physical link between each host and the center of the star. The node at the center of the star can be either a piece of equipment that amplifies an electrical signal, or an active device, such as a piece of equipment that understands the format of the messages exchanged through the network. Of course, the failure of the central node implies the failure of the network. However, if one physical link fails (e.g. because the cable has been cut), then only one node is disconnected from the network. In practice, star-shaped networks are easier to operate and maintain than bus-shaped networks. Many network administrators also appreciate the fact that they can control the network from a central point. Administered from a Web interface, or through a console-like connection, the center of the star is a useful point of control (enabling or disabling devices) and an excellent observation point (usage statistics).
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../../principles/transport.rst:29
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Alice : `Hello`
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../../bibliography.rst:35
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Bux, W., `Token-ring local-area networks and their performance <http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=18625>`_, Proceedings of the IEEE, Vol 77, No 2, p. 238-259, Feb. 1989
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../../glossary.rst:268
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ARP
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../../index.rst:160
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Indices and tables
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../../exercises/ex-sharing.rst:175
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Same question as above, but now assume that the retransmission timer of each host is set to 50 microseconds.
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../../exercises/network.rst:96
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the router located in `New York`
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../../exercises/sockets.rst:110
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Sending data to a peer using a socket
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../../exercises/transport.rst:86
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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.
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../../principles/naming.rst:54
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The syntax of the domain names has been defined more precisely in :rfc:`1035`. This document recommends the following :term:`BNF` for fully qualified domain names (the domain names themselves have a much richer syntax).
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../../principles/network.rst:35
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As a first step, let us assume that we only need to exchange a small amount of data. In this case, there is no issue with the maximum length of the frames. However, there are other more interesting problems that we need to tackle. To understand these problems, let us consider the network represented in the figure below.
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../../principles/referencemodels.rst:38
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the Physical layer may change, e.g. due to electromagnetic interference, the value of a bit being transmitted
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../../principles/reliability.rst:44 • ../../principles/reliability.rst:49
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Bit rate
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../../principles/transport.rst:30
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Bob : `Hello`
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