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ru.unix.bsd
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From : Slawa Olhovchenkov 2:5030/500 10 Jun 2002 02:09:12
To : Ilia Kuliev
Subject : OSI (Was: Arp error messages)
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09 Jun 02, Ilia Kuliev writes to Spartak Radchenko:
IK>>> Hа тебя не угодишь... Что в твоем понимании есть умные книжки и
IK>>> правильные ответы, я тогда уж и не знаю.
SR>> Видишь ли... Твой ответ насчёт Presentation Layer был полным бредом.
SR>> А ты всё "умная книжка, правильные ответы".
IK> Переадресуй свое негодование автору умной книжки :)
IK> Могу дать его email, застрой его, как положено...
Свою голову на плечах иметь надо.
IK> Кстати, интересно было бы узнать твое мнение, что есть пример
IK> Presentation Layer'а.
7.2.2 Purpose
7.2.2.1 The Presentation Layer provides for the representation of information
that application-entities either communicate or refer to in their communication.
7.2.2.2 The Presentation Layer provides for common representation of the data
transferred between application-entities. This relieves application-entities of
any concern with the problem of "common" representation of information, i.e., it
provides them with syntax independence.
7.2.2.3 The Presentation Layer ensures that the information content of the
Application Layer data is preserved during transfer. Cooperating
application-entities are responsible for determinng the set of abstract syntaxes
they employ in their communication. The Presentation Layer is informed of the
abstract syntaxes that are to be employed. Knowing the set of abstract syntaxes
to be used by the application-entities, the Presentation Layer is responsible
for selecting mutually acceptable transfer syntaxes.
NOTE - Presentation-entities have no role in determining the set of abstract
syntaxes to be used by the application-entities.
7.2.3 Services provided to the Application Layer
7.2.3.1 The Presentation Layer provides the following facilities:
a) identification of a set of transfer syntaxes;
b) selection of transfer syntax; and
c) access to session services
7.2.3.2 Identification of a set of transfer syntaxes provides one or more means
of representing an abstract syntax. Selection of transfer syntax provides the
means of initially selecting a transfer syntax and subsequently modifying the
selection.
7.2.3.3 Session services are provided to application-entities in the form of
presentation services.
7.2.3.4 In connectionless-mode, segmentation and resassembly are not provided
in the Presentation Layer. Thus, the size of presentation-service-data-units is
limited by the size of presentation-protocol-data-units and
presentation-protocol-control-information.
Hу дальше лень цитировать. Короче -- в потоке дерьма умеет находит жемчужины
объектов. MIDI сюда никаким боком. А вот NFS -- да.
... Hе стоит пить из лужи -- пригодиться плюнуть.
--- GoldED+/BSD 1.1.5
* Origin: (2:5030/500)
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OSI (Was: Arp error messages)