If more than one hostname is used, it can be set to the external domain.

如果使用不止一个主机名，可以将它设为外部域。

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Gateway (controlled and secure interaction between internal and external domain boundaries).

网关(控制并保护内部和外部域边界之间的交互)。

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Typically, administrators for an organization cross-certify their IDs with the external domain.

通常，一个组织的管理员通过外部域交叉证明他们的ID。

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Because of this new world of information sharing and audience fragmentation, it is important that the messaging in advertising, media (in a PR domain), product packaging, internal and external memos, etc. be consistent.

FORBES: PR Is Dead

Perhaps in some slow-moving companies, those hardened-silo outlooks persist, but in top-performing businesses across the world, all C-level execs are balancing their domain expertise with intense focus on customer behavior and other external factors.

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That is extraordinary behavior for a global company worth a quarter-trillion dollars whose traditional value lies in linking users to external sites -- in other words, getting you out of the domain ASAP.

ENGADGET: Editorial: FTC and Google -- why the right decision feels so wrong to so many people