Exit Zen
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../../exercises/ex-sharing.rst:231
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With CSMA, hosts need to listen to the communication channel before starting their transmission. Consider again a 2 kilometers long cable where hosts send frames at 100 Mbps. Show in the figure below the correct transmission of frames with CSMA.
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../../exercises/reliability.rst:32
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Each frame contains `D` bytes of data and `c` bytes of control information
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../../exercises/network.rst:99
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Is it possible to configure the link metrics so that the packets sent by the router located in `Los Angeles` to the routers located in respectively `New York` and `Washington` do not follow the same path ?
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../../exercises/sockets.rst:114
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The ``sendto`` system call allows to send data to a peer identified by its socket address through a given socket.
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../../exercises/transport.rst:105
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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.
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../../principles/naming.rst:73
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This grammar specifies that a host name is an ordered list of labels separated by the dot (`.`) character. Each label can contain letters, numbers and the hyphen character (`-`) [#fidn]_. Fully qualified domain names are read from left to right. The first label is a hostname or a domain name followed by the hierarchy of domains and ending with the root implicitly at the right. The top-level domain name must be one of the registered TLDs [#ftld]_. For example, in the above figure, `www.computer-networking.info` corresponds to a host named `www` inside the `computer-networking` domain that belongs to the `info` top-level domain.
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../../principles/referencemodels.rst:40
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the Physical layer may deliver `fewer` bits to the receiver than the bits sent by the sender
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../../principles/network.rst:68
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To understand the key principles behind the operation of a network, let us analyze all the operations that need to be performed to allow host `A` in the above network to send one byte to host `B`. Thanks to the datalink layer used above the `A-R1` link, host `A` can easily send a byte to router `R1` inside a frame. However, upon reception of this frame, router `R1` needs to understand that this byte is destined to host `B` and not to itself. This is the objective of the network layer.
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../../principles/reliability.rst:49
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Bits per second
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../../principles/transport.rst:32
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Bob : `11:55`
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../../protocols/dns.rst:48
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DNS Resource Records
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../../principles/security.rst:155
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Eavesdropping and pervasive monitoring are not the only possible attacks against a network. Another type of attacker is the active attacker. In the literature, these attacks are often called `Man in the middle` or `MITM` attacks. Such attacks occur when one user, let us call him `Mallory`, has managed to configure the network so that he can both capture and modify the packets exchanged by two users. The simplest scenario is when Mallory controls a router that is on the path used by both Alice and Bob. For example, Alice could be connected to a WiFi access router controlled by Mallory and Bob would be a regular server on the Internet.
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../../exercises/dns.rst:41
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What are the IP addresses of the resolvers that the `dig` implementation you are using relies on [#fdig]_ ?
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../../exercises/email.rst:27
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On Unix hosts, a subset of the port assignments is often placed in `/etc/services`.
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../../exercises/http.rst:33
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Some websites are reachable over both IPv4 and IPv6 while others are only reachable over IPv4 [#fv6only]_. You can use the `-6` (resp. `-4`) option to force curl_ to only use IPv6 (resp. IPv4). Verify that `www.computer-networking.info` is reachable over IPv6 and IPv4 and then check whether your university website already supports IPv6.
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../../exercises/ipv6.rst:41
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router ``R2`` uses address ``2001:db8:1341:12::2`` on its West interface, address ``2001:db8:1341:23::2`` on its South-West interface and address ``2001:db8:1341:24::2`` on its South interface.
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../../exercises/lan.rst:83
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Fig. 4. Can `H0` and `H1` communicate ?
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../../exercises/routing-policies.rst:141
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Should `AS123` change its configuration ?
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../../exercises/routing-protocols.rst:175
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The ``show ipv6 ospf6`` command reports the general state of the OSPFv3 daemon. The ``show ipv6 ospf6 neighbor`` command reports the state of the connected neighbors.
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../../exercises/tcp-2.rst:63
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The ``0`` indicates that the system call must be issued immediately. packetdrill_ then executes the system call and verifies that it returns ``3```. If yes, the processing continues. Otherwise the script stops and indicates an error.
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