创建一个RAID0(条带)设备称为md 1，用作交换区。
Create a RAID 0 (stripe) device called md1 and use it as swap.
一种典型的WAN由称为信息包交换机的电子设备通过通信线路连接而成。
A typical WAN consists of electronic devices called packet switches interconnected by communication lines.
被称为电路交换机的交换设备没有存储或控制用户送往终点路由的数据的能力。
The switches, called circuit switches, have no capability of storing or manipulating user's data on their way to the destination.
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