集线器和交换机都是网络连接中的重要物理器件。下列关于集线器和交换机的说法中，正确的是______。

(88)

(87)

(86)

(85)

An Intranet is (71) the application of Internet technology within an internal or closed user group．Internets are company and not do not have a (72) connection to the Internet．Usedproperly an Internet is highly effective corporate tool，capable of regularly (73) information toempower the workforce with the information needed to perform. their roles．Used in this Way，Internet represent a step towards the (74) office．

(84)

(83)

(82)

在网络管理系统中，通常采用(52)模型。在网络管理的四要素中，(53)用于记录网络甲管理对象的信息；(54)用于在管理系统与管理对象之间传递操作命令。

(81)

(80)

(79)