● Both bus and tree topologies are characterized by the use of multipoint （71）. For the bus, all stations attach, through appropriate hardware（72）known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the （73）. A transmission from any station propagates the length of the medium in both directions and can be received by all other （74）.At each end of the bus is a （75) , which absorbs any signal, removing it from the bus.

（71）

● 采用OSPF协议配置路由协议时，主干区域为 （70） 。

（70）

● Both bus and tree topologies are characterized by the use of multipoint （71）. For the bus, all stations attach, through appropriate hardware（72）known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the （73）. A transmission from any station propagates the length of the medium in both directions and can be received by all other （74）.At each end of the bus is a （75) , which absorbs any signal, removing it from the bus.

（71）

● 交换机配置命令2950A (vlan)#vlan 3 name vlan3的作用是 （69） 。   

（69）

● 建筑物综合布线系统中的干线子系统是 （68） 。

（68）

● 下列关于ADSL的描述中，错误的是 （65） 。

（65）

● 下列关于DHCP 服务器的描述中，正确的是 （67） 。

（67）

● 下列DNS 服务器中负责非本地域名查询的是 （66） 。

（66）

● 在Linux操作系统中，默认的系统管理帐户为 （63） 。

（63）

● 在Linux操作系统中，可以通过（64）命令终止进程的执行。

（64）

● 在路由器配置中，将新的静态路由添加进路由表需要在 （62） 下进行。 

（62）