Exit Zen
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../../protocols/ipv6.rst:408
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Token Ring
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../../protocols/ethernet.rst:404
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Another important advantage of Ethernet switches is the ability to create Virtual Local Area Networks (VLANs). A virtual LAN can be defined as a `set of ports attached to one or more Ethernet switches`. A switch can support several VLANs and it runs one MAC learning algorithm for each Virtual LAN. When a switch receives a frame with an unknown or a multicast destination, it forwards it over all the ports that belong to the same Virtual LAN but not over the ports that belong to other Virtual LANs. Similarly, when a switch learns a source address on a port, it associates it to the Virtual LAN of this port and uses this information only when forwarding frames on this Virtual LAN.
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../../protocols/tcp.rst:362
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TCP's retransmission timeout
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../../glossary.rst:300
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Internet protocol allow to transport sequences of bytes. These sequences of bytes are sufficient to carry ASCII characters. The network-byte order refers to the Big-Endian encoding for 16 and 32 bits integer. See https://en.wikipedia.org/wiki/Endianness
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../../principles/dv.rst:54
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The router iterates over all addresses included in the distance vector. If the distance vector contains a destination address that the router does not know, it inserts it inside its routing table via link `l` and at a distance which is the sum between the distance indicated in the distance vector and the cost associated to link `l`. If the destination was already known by the router, it only updates the corresponding entry in its routing table if either :
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../../principles/reliability.rst:429
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Odd parity
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../../principles/transport.rst:684
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The first scenario is when the remote entity receives an old `CR` segment. It considers this `CR` segment as a connection establishment attempt and replies by sending a `CA` segment. However, the initiating host cannot match the received `CA` segment with a previous connection attempt. It sends a control segment (`REJECT` in the figure below) to cancel the spurious connection attempt. The remote entity cancels the connection attempt upon reception of this control segment.
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../../principles/sharing.rst:617
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During the 1970s and 1980s, there were huge debates in the networking community about the best suited Medium Access Control algorithms for Local Area Networks. The optimistic algorithms that we have described until now were relatively easy to implement when they were designed. From a performance perspective, mathematical models and simulations showed the ability of these optimistic techniques to sustain load. However, none of the optimistic techniques are able to guarantee that a frame will be delivered within a given delay bound and some applications require predictable transmission delays. The deterministic MAC algorithms were considered by a fraction of the networking community as the best solution to fulfill the needs of Local Area Networks.
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../../protocols/bgp.rst:444
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Based on these studies and [ATLAS2009]_, the AS-level Internet topology can be summarized as shown in the figure below.
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../../protocols/email.rst:252
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s
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../../protocols/ethernet.rst:406
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The figure below illustrates a switched Ethernet network with three Virtual LANs. `VLAN2` and `VLAN3` only require a local configuration of switch `S1`. Host `C` can exchange frames with host `D`, but not with hosts that are outside of its VLAN. `VLAN1` is more complex as there are ports of this VLAN on several switches. To support such VLANs, local configuration is not sufficient anymore. When a switch receives a frame from another switch, it must be able to determine the VLAN in which the frame originated to use the correct MAC table to forward the frame. This is done by assigning an identifier to each Virtual LAN and placing this identifier inside the headers of the frames that are exchanged between switches.
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../../protocols/tcp.rst:364
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In a go-back-n transport protocol such as TCP, the retransmission timeout must be correctly set in order to achieve good performance. On one hand, if the retransmission timeout expires too early, then bandwidth is wasted by retransmitting segments that have already been correctly received. On the other hand, if the retransmission timeout expires too late, then bandwidth is wasted because the sender is idle waiting for the expiration of its retransmission timeout.
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../../glossary.rst:217
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NFS
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../../principles/reliability.rst:429
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Even parity
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../../principles/transport.rst:690
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Three-way handshake : recovery from a duplicate `CR`
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../../protocols/bgp.rst:450
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The layered structure of the global Internet
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../../protocols/email.rst:252
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../../protocols/ipv6.rst:409
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FDDI
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../../protocols/ethernet.rst:413
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Virtual Local Area Networks in a switched Ethernet network
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