第三个方面就是根域名服务器，这些服务器如何接受管理和控制。
The third element is the root name servers, how these servers are managed and controlled.
当前有13个根域名服务器，将域名转为IP号，并且让我们能够通过庞大的网络彼此交流。
There are some 13 root name servers that resolve domain names into IP Numbers, and therefore enable us to communicate across this large network.
与根域名服务器等顶级域相比，本地的权威名字服务器更易于发生设备故障和遭受恶意攻击。
Comparing with the top-level domains (TLD) such as the root servers, the local authoritative servers were more vulnerable to device failures and malicious attacks.
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