The system login uses information such as source ID (SID), domain and system user name for authentication, so it is considered secure.

系统登录会使用到诸如源 ID（安全识别符），域和系统用户名等信息进行身份验证，因此被认为是安全的。

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DNS refers to the Domain Name System, which is a directory that connects names to numerical Internet addresses.

DNS 指的是域名系统，它是一个目录，将名称连接到数字互联网地址。

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A domain name System (DNS) server interprets IP addresses into domain names and locations of other computers or Web sites.

域名系统(DNS)服务器将IP地址解释为其他计算机或网站的域名和地址。

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In 2011, ICANN decided to open up the domain system so that an almost infinite variety of names could be registered.

FORBES: New Domain Names Herald Latest Land Grab

The keys are then added to the Domain Name System (DNS) records for that domain.

FORBES: Google Says Google Apps Domains Were Protected From Massive Spoofing Vulnerability

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.

BBC: Global internet slows after 'biggest attack in history'