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Table Of Contents  CertiGuide to Network+
 9  Chapter 0011:  Network Hardware
      9  VII  Layers 5, 6 & 7 – Session, Presentation Application Layers

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 VIII  Chapter 0011: Summary
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Gateway
(Page 1 of 4)

A Gateway functions as a translator and can convert one protocol (one standardized communication method) to another. If protocol translation is not a comfortable thought, think of it as a language translator. Gateways may be very complex devices, depending on features purchased. The majority of gateways operate at the 7th layer (Application layer) of the OSI Model.

An easy trap to fall into, is to confuse gateways, (the hardware), with gateway, a logical (non-hardware software) decision point. In this section, the term gateway refers to hardware.

[spacer]Gateways

Gateways generally operate at the 5th, 6th or 7th layer(Session, Presentation or Application layer. Geekily speaking precisely, they operate at the layer of protocol they covert. This is usually the Application layer, but can include lower levels as well.


Several types of gateways are: Internet Gateways, Proxy Gateways, E-mail or SMTP (Simple Mail Transfer Protocol) Gateways, and SNA (Systems Network Architecture) Gateways.

Figure 39: Gateway

 

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 VIII  Chapter 0011: Summary
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