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../../protocols/ppp.rst:19
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The `Network Control Protocol` that is specific for each network layer protocol. It is used to negotiate options that are specific for each protocol. For example, IPv4's NCP :rfc:`1548` can negotiate the IPv4 address to be used, the IPv4 address of the DNS resolver. IPv6's NCP is defined in :rfc:`5072`.
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../../protocols/routing.rst:23
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A very important difference between intradomain and interdomain routing are the `routing policies` that are used by each domain. Inside a single domain, all routers are considered equal, and when several routes are available to reach a given destination prefix, the best route is selected based on technical criteria such as the route with the shortest delay, the route with the minimum number of hops or the route with the highest bandwidth.
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../../protocols/rpc.rst:15
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The callee places the return value(s) at a location (register, stack, ...) where the caller can access them
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../../protocols/ssh.rst:70
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The next message is the ``SSH_MSG_KEX_INIT`` message that is used to negotiate the cryptographic algorithms that will be used for the ``ssh`` session. It is very important for security protocols to include mechanisms that enable a negotiation of the cryptographic algorithms that are used. First, these algorithms provide different levels of security. Some algorithms might be considered totally secure and are recommended today while they could become deprecated a few years later after the publication of some attacks. Second, these algorithms provide different levels of performance and have different CPU and memory impacts.
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../../protocols/tcp.rst:19
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remote computer access : :term:`telnet`, :term:`ssh`, :term:`X11`, :term:`VNC`, ...
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../../protocols/tls.rst:41
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TCP port
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../../protocols/transport-service.rst:17
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the `host` on which the application is running
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../../protocols/udp.rst:19
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The figure below shows a typical usage of the UDP port numbers. The client process uses port number `1234` while the server process uses port number `5678`. When the client sends a request, it is identified as originating from port number `1234` on the client host and destined to port number `5678` on the server host. When the server process replies to this request, the server's UDP implementation will send the reply as originating from port `5678` on the server host and destined to port `1234` on the client host.
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../../protocols/wifi.rst:19
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Frequency
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../../bibliography.rst:24
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Bonomi, F. and Fendick, K.W., `The rate-based flow control framework for the available bit rate ATM service <https://dx.doi.org/10.1109/65.372653>`_, IEEE Network, Mar/Apr 1995, Volume: 9, Issue: 2, pages : 25-39
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../../exercises/ex-sharing.rst:119
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Same question as above, but now consider that the hosts transmit 1000 bits frames at 100 Mbps. The cable has a length of 2 kilometers. C is in the middle of the cable. Each square in the figure below corresponds to 10 microseconds.
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../../principles/transport.rst:27
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An `application-level protocol` is similar to a structured conversation between humans. Assume that Alice wants to know the current time but does not have a watch. If Bob passes close by, the following conversation could take place :
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../../principles/security.rst:73
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The first type of attacker is called the `passive attacker`. A `passive attacker` is someone able to observe and usually store the information (e.g. the packets) exchanged in a given network or subset of it (e.g. a specific link). This attacker has access to all the data passing through this specific link. This is the most basic type of attacker and many network technologies are vulnerable to such attacks. In the above example, a passive attacker could easily capture the password sent by Alice and reuse it later to be authenticated as Alice on the remote computer. This is illustrated in the figure below where we do not show anymore the ``DATA.req`` and ``DATA.ind`` primitives but only the messages exchanged. Throughout this chapter, we will always use `Eve` as a user who is able to eavesdrop the data passing in front of her.
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../../exercises/dns.rst:35
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`server` is the IP address or the name of a DNS server or resolver
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../../exercises/email.rst:18
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The TCP protocol supports 65536 different ports numbers. Many of these port numbers have been reserved for some applications. The official repository of the reserved port numbers is maintained by the Internet Assigned Numbers Authority (IANA_) on http://www.iana.org/assignments/port-numbers [#fservices]_. Using this information, what is the default port number for the POP3 protocol ? Does it run on top of UDP or TCP ?
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../../exercises/http.rst:25
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HTTP 1.1, specified in :rfc:`2616`, forces the client to include the `Host:` header in all its requests. HTTP 1.0 does not define the `Host:` header, but most implementations support it. By using `telnet` and `curl` retrieve the first page of the https://www.computer-networking.info web server [#fhttps]_ by sending http requests with and without the `Host:` header. Explain the difference between the two.
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../../exercises/ipv6.rst:35 • ../../exercises/ipv6.rst:144 • ../../exercises/ipv6.rst:222
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host ``A`` : ``2001:db8:1341:1::A`` and its default route points to ``2001:db8:1341:1::1``
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../../exercises/lan.rst:62
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Fig. 2. A typical enterprise backbone network
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../../exercises/routing-policies.rst:63 • ../../exercises/routing-policies.rst:96
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Consider the interdomain topology shown in the figure below. Assuming, that `AS1` advertises prefix ``2001:db8:1::/48``, `AS2` prefix ``2001:db8:2::/48``, ... compute the routing tables of the different ASes.
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../../exercises/routing-protocols.rst:106
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The script starts the routers and hosts.
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