Compaq 222863-001 TaskSmart W2200 Administration Guide - Page 106

ISO/OSI Reference Model, Layer 7: Application, Layer 6: Presentation

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B-2 Compaq TaskSmart W2200 Appliance Server Administration Guide ISO/OSI Reference Model A relational place to start when discussing networks is the International Standards Organization/Open Systems Interconnection (ISO/OSI) reference model. The model is important because it was established to help multivendor computer systems to communicate. The model is split into layers that are responsible for certain tasks. The model is depicted in Figure B-1. Each layer is briefly described beginning with the Application layer. Layer 7: Application Layer 6: Presentation Layer 5: Session Layer 4: Transport Layer 3: Network Layer 2: Data Link Layer 1: Physical Applications Cabling Figure B-1. ISO/OSI reference model Layer 7: Application The Application layer does not really deal with applications; its purpose is to provide communications services to applications. The environmental control in which the functions take place is controlled in the application layer. A device that works at this level is a gateway. A gateway is a device that translates between two different types of systems that use different communication protocols, data formatting, structures, languages, or architecture. Gateways can also act as proxy servers and firewalls. Layer 6: Presentation The Presentation layer can also be referred to as the syntax layer. The rules that administer the data encoding, data decoding, and relations as to the character sets are the responsibilities of this layer.

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B-2
Compaq TaskSmart W2200 Appliance Server Administration Guide
ISO/OSI Reference Model
A relational place to start when discussing networks is the International
Standards Organization/Open Systems Interconnection (ISO/OSI) reference
model. The model is important because it was established to help multivendor
computer systems to communicate. The model is split into layers that are
responsible for certain tasks. The model is depicted in Figure B-1. Each layer
is briefly described beginning with the Application layer.
Applications
Layer 7:
Application
Layer 6:
Presentation
Layer 5:
Session
Layer 4:
Transport
Layer 3:
Network
Layer 2:
Data Link
Layer 1:
Physical
Cabling
Figure B-1.
ISO/OSI reference model
Layer 7: Application
The Application layer does not really deal with applications; its purpose is to
provide communications services to applications. The environmental control
in which the functions take place is controlled in the application layer. A
device that works at this level is a gateway. A gateway is a device that
translates between two different types of systems that use different
communication protocols, data formatting, structures, languages, or
architecture. Gateways can also act as proxy servers and firewalls.
Layer 6: Presentation
The Presentation layer can also be referred to as the syntax layer. The rules
that administer the data encoding, data decoding, and relations as to the
character sets are the responsibilities of this layer.