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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.
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