One of the killer applications for DEN when it was announced was the ability to link QoS policies to users via directories.But bandwidth has become cheaper and more plentiful in the LAN over the past two years,and that made QoS much less of an issue.

• 当年宣布DEN时最具冲击力的应用之一是，通过目录把QoS政策与用户联系起来的能力，但在过去两年局域网中带宽变得更为便宜和充足，使QoS不再是个问题。