单选题在HTML页面文件中，文档的标题应放在（ ）之间。
单选题在Internet中， (62) 拨号协议支持LCP层的差错检测．
单选题在Word中，如果要将文中所有的“需要”修改为“需求”，则应该单击 (3) 。 A．“编辑”-＞“批量修订” B．“编辑”-＞“批量修改” C．“编辑”-＞“替换” D．“修改”-＞“批量修订”
单选题Multipurpose Internet Mail Extension (MIME) is a (71) document messaging standard in theInternet enviroment.With MIME，users can send (72) Email messages that include audio，video，graphices，and text to any other user of TC/IP network.Richtext information can also be (73) into messages.It defines the fonts，formats，and (74) features of a document sothe document can be easily (75) on many different types of systems.
单选题在Windows的命令行窗口中键入命令
C:/> nslookup
set type= SOA
>202.30.192.2
这个命令序列的作用是查询（ ）。
单选题Internet由多个网络层次组成，下面哪一项不是构成Internet的网络层次名称 (44) 。
单选题子网掩码的作用是 (34) 。
单选题在Cisco路由器上可以使用 (49) 命令查看路由表。
单选题以下不属于防火墙技术的是 (56) 。
单选题在网页中添加的多媒体不包括______。 A．AVI动画 B．Flash动画 C．JavaScript脚本 D．MIDI音乐
单选题 (66) is a channel' s capacity which directly reflects the data transfer rate of the channel. (67) functions in a NetWare network which is used to define addressing schemes. (68) is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains. (69) ．is the popular LAN develped under the direction of the IEEE 802.3. (70) is a device which enables digital microcomputers to communicate across analog telephone lines.
单选题通道处理机在数据传送过程中，通道选择一次设备需要的时间为4.8μs，传送一个字节数据需0.2μs。某设备每隔500μs发出一次传送一个字节数据的请求。该通道处理机进行字节多路通道传送时，通道极限流量应为{{U}} {{/U}}。在理想的情况下，此通道上最多可挂接{{U}} {{/U}}台这样的设备。
单选题
单选题Firewall is a （ ） mechanism used by organizations to protect their LANs from the Internet.
单选题对局域网来说，网络控制的核心是______。
单选题下面______不是红外局域网采用的数据传输技术? A．定向光束红外传输 B．全方位红外传输 C．漫反射红外传输 D．绕射红外传输
单选题在OSI网络管理标准中，将网络管理分为系统管理，层管理和层操作。在 (41) 中提出了故障管理，配置管理，计费管理，性能管理和安全管理。其中 (42) 保证网络不被非法使用。
单选题在Linux中，设备文件：/dev/sdb5标识的是 (56) 。
单选题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．