单选题TCP/IP实用程序中，Ping程序的主要功能是______。

单选题通过______服务可以登录远程主机进行系统管理，该服务默认使用______端口。

单选题市场流行的网络管理系统一般都未实现______功能。 A．性能管理 B．安全管理 C．故障管理 D．配置管理

单选题下面关于在.asp文件中变量的作用域的说法正确的一项是______。

单选题CSMA/CD协议可以利用多种监听算法来减小发送冲突的概率，下面关于各种监听算法的描述中，正确的是______。 A．非坚持型监听算法有利于减少网络空闲时间 B．坚持型监听算法有利于减少冲突的概率 C．P坚持型监听算法无法减少网络的空闲时间 D．坚持型监听算法能够及时抢占信道

单选题We have already covered the topic of network addresses. The first ______ in a block (in class A, B, and C) defines the network address. In classes A, B, and C, if the hosted is all 1 s, the addressis called a direct broadcast address. It is used by a ______ to send a packet to all hosts in a specificnetwork. All hosts will accept a packet having this type of destination address. Note that thisaddress can be used only as a ______ address in an IP packet. Note also that this special addressalso reduces the number if available hosted for each netid in classes A, B, and C. In classes A, B, and C, an address with all 1 s for the netid and hosted (32 bits) define a ______ address in the current network. A host that wants to send a message to every other hosts can use this address as destinationaddress in an IP packet. However, a router will block a packet having this type of address to confine thebroadcasting to the ______ network. Note that this address belongs to class E.

单选题第二代计算机网络的主要特点是（ ）。

单选题下面的FTP命令中，用于在远程计算机上创建目录的命令是______。

单选题若想将窗体中的数据发送到服务器，并由服务器脚本处理，应将＜INPUT＞标记的TYPE属性值设为______。

单选题 FTP使用的传输层协议为{{U}} (7) {{/U}}；FTP有两个端口，用作控制连接的默认端口号为{{U}} (8) {{/U}}，用作数据传输的默认端口号为{{U}} (9) {{/U}}。

单选题一般情况下，FTP服务的端口是______。

单选题IEEE 802.11定义了无线局域网的两种工作模式，其中______模式是一种点对点连接的网络，不需要无线接入点和有线网络的支持。

单选题下面关于TITLE元素说法正确的一项是______。

单选题100BASE-T的传输介质是______。 A．3类双绞线 B．5类双绞线 C．光纤 D．同轴电缆

单选题The presentation layer is concerned with the ______ and semantics of the information exchanged between two systems. The processes in two systems are usually exchanginginformation in the form of character ______, numbers, and so on. The information should bechanged to bit ______ before being transmitted. Because different encoding systems, thepresentation layer is responsible for ______ between these different encoding methods. Thepresentation layer at the sender changes the information from its sender-dependent format into acommon format. The presentation layer at the receiving machine changes the common format intoits ______ dependent format.

单选题以下哪些内容是路由信息中所不包含的

单选题要添加一条到达目标10.41.0.0(子网掩码为255.255.0.0)的路由，下一个跃点的地址为10.27.0.1，则输入______命令。 A．route add 10.41.0.0 mask 255.255.0.0 10.27.0.1 B．route add 10.41.0.0 mask 0.0.255.255 10.27.0.1 C．route add 10.27.0.1 mask 255.255.0.0 10.41.0.0 D．route add 10.27.0.1 mask 0.0.255.255 10.41.0.0

单选题社会信息化的基础和核心部分是______。

单选题下面是一段HTML标记，其显示结果是一个______表格。 ＜HTML＞ ＜HEAD＞ ＜TITLE＞基本表格＜/TITLE＞ ＜/HEAD＞ ＜BODY bgcolor="#FFFFFF"＞ ＜TABLE border="1"＞ ＜tr＞＜td＞姓名＜/td＞＜td＞学校＜/td＞＜/tr＞ ＜tr＞＜td＞张莫＜/td＞＜td＞交大＜/td＞＜/tr＞ ＜tr＞＜td＞陈和＜/td＞＜td＞重大＜/td＞＜/tr＞ ＜/TABLE＞ ＜/BODY＞ ＜/HTML＞

单选题当Web服务器需要外部应用程序才能够完成客户的请求时，通常可以使用来完成。