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../../exercises/network.rst:378
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An important difference between OSPF and RIP is that OSPF routers flood link state packets that allow the other routers to recompute their own routing tables while RIP routers exchange distance vectors. Consider that link `B-C` fails and that router `B` is the first to detect the failure. At this point, `B` cannot reach anymore `C`, `D` and `E`. `C` cannot reach `B` and `A` anymore.
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../../principles/network.rst:302
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Dealing with heterogeneous datalink layers
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../../principles/reliability.rst:241
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`@` : `1000000` b
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../../principles/sharing.rst:273
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We first discuss a simple deterministic MAC algorithm and then we describe several important optimistic algorithms, before coming back to a distributed and deterministic MAC algorithm.
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../../principles/transport.rst:225
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the `connection oriented service`
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../../glossary.rst:147
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IGP
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../../exercises/network.rst:380
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Router `B` will flood its updated link state packet through the entire network and all routers will recompute their forwarding table. Upon reception of a link state packet, routers usually first flood the received link-state packet and then recompute their forwarding table. Assume that `B` is the first to recompute its forwarding table, followed by `D`, `A`, `C` and finally `E`.
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../../principles/network.rst:304
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Sometimes, the network layer needs to deal with heterogeneous datalink layers. For example, two hosts connected to different datalink layers exchange packets via routers that are using other types of datalink layers. Thanks to the network layer, this exchange of packets is possible provided that each packet can be placed inside a datalink layer frame before being transmitted. If all datalink layers support the same frame size, this is simple. When a node receives a frame, it decapsulates the packet that it contains, checks the header and forwards it, encapsulated inside another frame, to the outgoing interface. Unfortunately, the encapsulation operation is not always possible. Each datalink layer is characterized by the maximum frame size that it supports. Datalink layers typically support frames containing up to a few hundreds or a few thousands of bytes. The maximum frame size that a given datalink layer supports depends on its underlying technology. Unfortunately, most datalink layers support a different maximum frame size. This implies that when a host sends a large packet inside a frame to its nexthop router, there is a risk that this packet will have to traverse a link that is not capable of forwarding the packet inside a single frame. In principle, there are three possibilities to solve this problem. To discuss them, we consider a simple scenario with two hosts connected to a router as shown in the figure below.
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../../principles/reliability.rst:242
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`space` : `0100000` b
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../../principles/sharing.rst:277
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Static allocation methods
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../../principles/transport.rst:226
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the `request-response service`
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../../glossary.rst:149
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Interior Gateway Protocol. Synonym of intradomain routing protocol
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../../exercises/network.rst:382
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After each update of a forwarding table, verify which pairs of routers are able to exchange packets. Provide your answer using a table similar to the one shown above.
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../../principles/network.rst:323
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Consider in the network above that host `A` wants to send a 900 bytes packet (870 bytes of payload and 30 bytes of header) to host `B` via router `R1`. Host `A` encapsulates this packet inside a single frame. The frame is received by router `R1` which extracts the packet. Router `R1` has three possible options to process this packet.
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../../principles/reliability.rst:244
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In addition, the :term:`ASCII` table also defines several non-printable or control characters. These characters were designed to allow an application to control a printer or a terminal. These control characters include `CR` and `LF`, that are used to terminate a line, and the `BEL` character which causes the terminal to emit a sound.
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../../principles/sharing.rst:279
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A first solution to share the available resources among all the devices attached to one Local Area Network is to define, `a priori`, the distribution of the transmission resources among the different devices. If `N` devices need to share the transmission capacities of a LAN operating at `b` Mbps, each device could be allocated a bandwidth of :math:`\frac{b}{N}` Mbps.
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../../principles/transport.rst:229
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The connectionless service
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../../glossary.rst:162
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IGRP
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../../principles/network.rst:325
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The packet is too large and router `R1` cannot forward it to router `R2`. It rejects the packet and sends a control packet back to the source (host `A`) to indicate that it cannot forward packets longer than 500 bytes (minus the packet header). The source could react to this control packet by retransmitting the information in smaller packets.
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../../principles/reliability.rst:246
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`NUL`: `0000000` b
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