rfc9621v2.txt   rfc9621.txt 
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Endpoints. Endpoints.
Server: The peer responsible for responding to a Connection Server: The peer responsible for responding to a Connection
initiation. initiation.
Socket: The combination of a destination IP address and a Socket: The combination of a destination IP address and a
destination port number [RFC8303]. destination port number [RFC8303].
System Policy: The input from an operating system or other global System Policy: The input from an operating system or other global
preferences that can constrain or influence how an implementation preferences that can constrain or influence how an implementation
will gather Candidate Paths and Protocol Stacks and race the will gather Candidate Paths and Candidate Protocol Stacks and race
candidates during establishment of a Connection. the candidates during establishment of a Connection.
Transport Feature: A specific end-to-end feature that the transport Transport Feature: A specific end-to-end feature that the transport
layer provides to an application. layer provides to an application.
Transport Property: A property of a transport protocol and the Transport Property: A property of a transport protocol and the
services it provides [RFC8095]. services it provides [RFC8095].
Transport Service: A set of transport features, not associated with Transport Service: A set of transport features, not associated with
any given framing protocol, that provides a complete service to an any given framing protocol, that provides a complete service to an
application. application.
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phase (Section 4.2.2). phase (Section 4.2.2).
Candidate Protocol Stack: One Protocol Stack that can be used by an Candidate Protocol Stack: One Protocol Stack that can be used by an
application for a Connection, for which there can be several application for a Connection, for which there can be several
candidates. Candidate Protocol Stacks are identified during the candidates. Candidate Protocol Stacks are identified during the
gathering phase (Section 4.2.1) and are started during the racing gathering phase (Section 4.2.1) and are started during the racing
phase (Section 4.2.2). phase (Section 4.2.2).
System Policy: The input from an operating system or other global System Policy: The input from an operating system or other global
preferences that can constrain or influence how an implementation preferences that can constrain or influence how an implementation
will gather candidate paths and Protocol Stacks (Section 4.2.1) will gather Candidate Paths and Candidate Protocol Stacks
and race the candidates during establishment (Section 4.2.2). (Section 4.2.1) and race the candidates during establishment
Specific aspects of the System Policy apply to either all (Section 4.2.2). Specific aspects of the System Policy apply to
Connections or only certain Connections, depending on the runtime either all Connections or only certain Connections, depending on
context and properties of the Connection. the runtime context and properties of the Connection.
Cached State: The state and history that the implementation keeps Cached State: The state and history that the implementation keeps
for each set of associated Endpoints that have been used for each set of associated Endpoints that have been used
previously. This can include DNS results, TLS session state, previously. This can include DNS results, TLS session state,
previous success and quality of transport protocols over certain previous success and quality of transport protocols over certain
paths, as well as other information. This caching does not imply paths, as well as other information. This caching does not imply
that the same decisions are necessarily made for subsequent that the same decisions are necessarily made for subsequent
connections; rather, it means that cached state is used by a connections; rather, it means that cached state is used by a
Transport Services Implementation to inform functions such as Transport Services Implementation to inform functions such as
choosing the candidates to be raced, selecting appropriate choosing the candidates to be raced, selecting appropriate
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Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
7.2. Informative References 7.2. Informative References
[POSIX] "IEEE Standard for Information Technology -- Portable [POSIX] "IEEE/Open Group Standard for Information Technology -
Operating System Interface (POSIX(R))", IEEE Portable Operating System Interface (POSIX(TM)) Base
Std 1003.1-2008, DOI 10.1109/IEEESTD.2008.4694976, 2008, Specifications, Issue 8", IEEE Std 1003.1-2024,
<https://ieeexplore.ieee.org/document/4694976>. DOI 10.1109/IEEESTD.2024.10555529, 2024,
<https://ieeexplore.ieee.org/document/10555529>.
[RFC5482] Eggert, L. and F. Gont, "TCP User Timeout Option", [RFC5482] Eggert, L. and F. Gont, "TCP User Timeout Option",
RFC 5482, DOI 10.17487/RFC5482, March 2009, RFC 5482, DOI 10.17487/RFC5482, March 2009,
<https://www.rfc-editor.org/info/rfc5482>. <https://www.rfc-editor.org/info/rfc5482>.
[RFC6265] Barth, A., "HTTP State Management Mechanism", RFC 6265, [RFC6265] Barth, A., "HTTP State Management Mechanism", RFC 6265,
DOI 10.17487/RFC6265, April 2011, DOI 10.17487/RFC6265, April 2011,
<https://www.rfc-editor.org/info/rfc6265>. <https://www.rfc-editor.org/info/rfc6265>.
[RFC7556] Anipko, D., Ed., "Multiple Provisioning Domain [RFC7556] Anipko, D., Ed., "Multiple Provisioning Domain
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