Key to system is the idea of a "principal", which in this case is the triple of protocol, domain-name, and port. Each combination is isolated from any other combination at the process level.

Principal由协议、域名以及端口三部分组成，在进程级别不同的组合之间互相隔离，它是整个系统的关键部分。

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QEMU provides its own Dynamic Host Configuration Protocol (DHCP) and Domain Name system (DNS) servers for the benefit of the guest operating system alone.

QEMU提供自身的动态主机配置协议(DHCP)和域名系统(DNS)服务器用于客户操作系统本身。

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In order to support IPV6 protocol, it's need to extend current DNS to make it possible to implement of current addresses and domain name system from IPV6.

为了实现对IPv 6协议的支持，需要对现有IPv 4协议下的域名系统进行相应的扩展，以使其能在IPv 6协议下正确地进行IP地址与域名的解析。

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In July, security researcher Dan Kaminsky revealed a flaw in the Web's domain name system, or DNS, the protocol that connects a Web site's name with its physical location on the Internet.

FORBES: Dangerous Cybersilence

Specifically, ICANN is responsible for coordinating the assignment of protocol parameters, overseeing the domain name system, allocating IP-address space and managing the root-server system.

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Some weaknesses, already well-known to hackers, foreign governments and, most likely, jihadists, have been exposed in two areas: the Domain Name System that VeriSign oversees and the Border Gateway Protocol, which governs how Internet service providers and large networks exchange routing information.

FORBES: The Next Threat