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What is a gateway?

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2009-11-18 11:50:00
2009-11-18 11:50:00

A gateway is a network point that acts as an entrance to another network. On the internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within your company's network or at your local Internet service provider are gateway nodes.

Answer:
A gateway is a network point that acts as an entrance to another network. On the Internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within your company's network or at your local Internet service provider (ISP) are gateway nodes.

In the network for an enterprise, a computer server acting as a gateway node is often also acting as a proxy server and a firewall server. A gateway is often associated with both a router, which knows where to direct a given packet of data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway for a given packet--------------------------------------------------------------------------------------------------------------------------------------

ANSWER


Gateway is used between two dissimilar LAN s.A gateway is required to convert Data packets from one protocol format to another Protocol format,as it connects two dissimilar networks.
Router and Gateway both are sometimes used interchangeably but the difference is that Gateway operate on 7th layer of the OSI Model and the Router works on the 3rd layer of the OSI model.The OSI Layer consists of

  1. Physical,
  2. Data Link,
  3. Network,(performs establishment of connection between networks and the Routing and selecting best path)
  4. Transport,
  5. Session,
  6. Presentation and
  7. Application Layer. (Provides semantic exchange of data between application in an open system)
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