Bridges (and switches) forward frames from one interface to another based on the destination MAC address.

网桥(和交换机)根据目的MAC地址将帧从一个接口转发到另一个接口。

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After devices determine the IP addresses of the destination devices, they can add the destination MAC addresses to the data packets.

在设备决定目的地设备的IP位址之后，他们可以加入目的地MAC位址到资料封包。

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The load balance just forward the IP packets via mending the destination MAC or IP, so the real servers can send the answer packets direct to the clients.

前端仅仅只做转发，通过在IP层修改数据包的目的MAC或IP，使得后端服务器可以直接将应答包发给客户。

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Oct 2, 2012 -- Valve, creators of best-selling game franchises (such as Counter-Strike, Half-Life, Left 4 Dead, Portal, and Team Fortress) and leading technologies (such as Steam and Source), today announced the first Software titles have launched via Steam, marking a major expansion to the platform known as a leading destination for PC and Mac games.

ENGADGET: First non-game titles now available on Steam, game dev tools lead the charge