在 Windows 7 的 Network and Sharing Center > Change adapter settings, 有两个 地方可自行设定 Preferred/Alternate DNS server. (我用英文版 Windows.) 请问为何要分成两个地方? 如果各自设为不同的 DNS server, 会怎样? (1) 拨接连线 > Properties > Networking 页签 > Internet Protocol Version 4 > Use the following DNS server addresses (2) 区域连线 > Properties > Networking 页签 > Internet Protocol Version 4 > Use the following DNS server addresses