测试断言，网络客户端只被调用了一次，第一次使用之后网络stub就简单地抛出错误。
This test asserts that the network client is only used once by simply throwing an error from the network stub after the first use of it.
假定出现了某个网络问题，例如，靠近设备的路由器出错，或一组设备出错。
Suppose that some network issue emerges-a router close to the devices fails or a cluster of devices fails.
Cisco已经被警告,在Internet Operating System软件中具有三个可能引发拒绝服务,运行任意代码和系统出错的漏洞. "因为运行IOS的设备跨越数个不同类型的网络,第二轮大型拒绝服务攻击可能因此而起."
Cisco is warning of three vulnerabilities within its Internet Operating System software that could allow a denial-of-service attack or let a hacker run arbitrary code on an affected switch router.
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