While in our first example, we used 'd' by itself, this time we use the 'd' command preceded by an optional numerical address.

与第一个示例中只使用' d '不同的是，这一次使用的' d '前面有一个可选的数字地址。

youdao

If you know it, try using the website's numerical address rather than its verbose URL (Universal Resource Locator) name.

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Top-level domains are the air-traffic controllers of the Internet, routing requests for web sites to the proper numerical server address.

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In this case, Spamhaus's Domain Name System (DNS) servers were targeted - the infrastructure that joins domain names, such as bbc.co.uk, the website's numerical internet protocol address.

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