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198 ../../protocols/email.rst:363

	English BNF specification of the SMTP responses 39/10000 · 39
198 ../../protocols/ipv6.rst:713

	English ``2001:db8:1234:5678::1`` is assigned to ``router`` 51/10000 · 51
198 ../../protocols/tcp.rst:657

	English As a TCP client often establishes several parallel or successive connections with the same server, :rfc:`2140` has proposed to reuse for a new connection some information that was collected in the TCB of a previous connection, such as the measured rtt. However, this solution has not been widely implemented. 308/10000 · 308
199 ../../glossary.rst:199

	English X11 3/10000 · 3
199 ../../principles/reliability.rst:1054

	English The size of the sliding window can be either fixed for a given protocol or negotiated during the connection establishment phase. Some protocols allow to change the maximum window size during the data transfer. We will explain these techniques with real protocols later. 269/10000 · 269
199 ../../protocols/email.rst:366

	English SMTP servers use structured reply codes containing three digits and an optional comment. The first digit of the reply code indicates whether the command was successful or not. A reply code of `2xy` indicates that the command has been accepted. A reply code of `3xy` indicates that the command has been accepted, but additional information from the client is expected. A reply code of `4xy` indicates a transient negative reply. This means that for some reason, which is indicated by either the other digits or the comment, the command cannot be processed immediately, but there is some hope that the problem will only be transient. This is basically telling the client to try the same command again later. In contrast, a reply code of `5xy` indicates a permanent failure or error. In this case, it is useless for the client to retry the same command later. Other application layer protocols such as FTP :rfc:`959` or HTTP :rfc:`2616` use a similar structure for their reply codes. Additional details about the other reply codes may be found in :rfc:`5321`. 1057/10000 · 1057
199 ../../protocols/ipv6.rst:714

	English ``2001:db8:1234:5678::AA`` is assigned to ``hostA`` 51/10000 · 51
200 ../../glossary.rst:201

	English The XWindow system and the associated protocols are defined in [SG1990]_ 72/10000 · 72
200 ../../protocols/email.rst:368

	English Examples of SMTP reply codes include the following : 52/10000 · 52
200 ../../protocols/ipv6.rst:715

	English ``2001:db8:1234:5678::BB`` is assigned to ``hostB`` 51/10000 · 51
201 ../../glossary.rst:253

	English XML 3/10000 · 3
201 ../../protocols/email.rst:387

	English Reply code `220` is used by the server as the first message when it agrees to interact with the client. Reply code `221` is sent by the server before closing the underlying transport connection. Reply code `250` is the standard positive reply that indicates the success of the previous command. Reply code `354` indicates that the client can start transmitting its email message. Reply code `421` is returned when there is a problem (e.g. lack of memory/disk resources) that prevents the server from accepting the transport connection. Reply codes `450` and `452` indicate that the destination mailbox is temporarily unavailable, for various reasons, while reply code `550` indicates that the mailbox does not exist or cannot be used for policy reasons. The `500` to `503` reply codes correspond to errors in the commands sent by the client. The `503` reply code would be sent by the server when the client sends commands in an incorrect order (e.g. the client tries to send an email before providing the destination address of the message). 1043/10000 · 1043
201 ../../protocols/ipv6.rst:719

	English To be able to exchange IPv6 packets with ``hostB``, ``hostA`` needs to know the MAC address of the interface of ``hostB`` on the LAN. This is the `address resolution` problem. In IPv6, this problem is solved by using the Neighbor Discovery Protocol (NDP). NDP is specified in :rfc:`4861`. This protocol is part of ICMPv6 and uses the multicast datalink layer service. 367/10000 · 367
202 ../../glossary.rst:255

	English The eXtensible Markup Language (XML) is a flexible text format derived from SGML. It was originally designed for the electronic publishing industry but is now used by a wide variety of applications that need to exchange structured data. The XML specifications are maintained by `several working groups <https://www.w3.org/XML/>`_ of the :term:`W3C` 348/10000 · 348
202 ../../protocols/email.rst:389

	English The transfer of an email message is performed in three phases. During the first phase, the client opens a transport connection with the server. Once the connection has been established, the client and the server exchange greetings messages (`EHLO` command). Most servers insist on receiving valid greeting messages and some of them drop the underlying transport connection if they do not receive a valid greeting. Once the greetings have been exchanged, the email transfer phase can start. During this phase, the client transfers one or more email messages by indicating the email address of the sender (`MAIL FROM:` command), the email address of the recipient (`RCPT TO:` command) followed by the headers and the body of the email message (`DATA` command). Once the client has finished sending all its queued email messages to the SMTP server, it terminates the SMTP association (`QUIT` command). 898/10000 · 898
202 ../../protocols/ipv6.rst:727

	English NDP allows a host to discover the MAC address used by any other host attached to the same LAN. NDP operates in two steps. First, the querier sends a multicast ICMPv6 Neighbor Solicitation message that contains as parameter the queried IPv6 address. This multicast ICMPv6 NS is placed inside a multicast frame [#fndpmulti]_. The queried node receives the frame, parses it and replies with a unicast ICMPv6 Neighbor Advertisement that provides its own IPv6 and MAC addresses. Upon reception of the Neighbor Advertisement message, the querier stores the mapping between the IPv6 and the MAC address inside its NDP table. This table is a data structure that maintains a cache of the recently received Neighbor Advertisement. Thanks to this cache, a host only needs to send a Neighbor Solicitation message for the first packet that it sends to a given host. After this initial packet, the NDP table can provide the mapping between the destination IPv6 address and the corresponding MAC address. 989/10000 · 989
203 ../../protocols/email.rst:391

	English A successful transfer of an email message is shown below 56/10000 · 56
203 ../../protocols/ipv6.rst:738

	English The NS message can also be used to verify the reachability of a host in the local subnet. For this usage, NS messages can be sent in unicast since other nodes on the subnet do not need to process the message. 208/10000 · 208
204 ../../protocols/email.rst:418

	English In the example above, the MTA running on `mta.example.org` opens a TCP connection to the SMTP server on host `smtp.example.com`. The lines prefixed with `S:` (resp. `C:`) are the responses sent by the server (resp. the commands sent by the client). The server sends its greetings as soon as the TCP connection has been established. The client then sends the `EHLO` command with its fully qualified domain name. The server replies with reply-code `250` and sends its greetings. The SMTP association can now be used to exchange an email. 535/10000 · 535
204 ../../protocols/ipv6.rst:740

	English When an entry in the NDP table times out on a host, it may either be deleted or the host may try to validate it by sending the NS message again. 144/10000 · 144

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