With application and circuit gateways, all packets are addressed to a user-level application on a gateway that relays packets between two points.
用应用软件与线路入口时，所有的包都按地址送给入口上的用户 级应用程序，入口在两点间转送这些包。
With application and circuit gateways, all packets are addressed to a user-level application on a gateway that relays packets between two points.
用应用软件与线路入口时，所有的包都按地址送给入口上的用户 级应用程序，入口在两点间转送这些包。
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