单选题在进行DNS查询时,首先向( )进行域名查询,以获取对应的IP地址
单选题完整的IPX地址包含 (35) 个字节。
单选题以下关于S-HTTP的描述中,正确的是______。
单选题以下关于通信子网规划设计的各种考虑中,错误的是______。 A.层次化设计的好处是可以有效地将全局通信问题分解考虑 B.网络拓扑结构必须具有一定的灵活性,易于重新配置 C.网络拓扑结构设计应避免因个别节点损坏而影Ⅱ向整个网络的正常运行 D.应用服务器应该放置在接入层,以利于客户端就近快速访问
单选题在windows用户管理中,使用组策略A-G-DL孔其中A表示( )。
单选题在关于类的实例化的描述中,正确的是______。 A.同一个类的对象具有不同的静态数据成员值 B.不同的类的对象具有相同的静态数据成员值 C.同一个类的对象具有不同的对象自身引用(this)值 D.不同的类的对象具有相同的对象自身引用(this)值
单选题下面关于网络系统设计原则的说法中,正确的是 ( ) 。
单选题某家庭用户需要通过无线局域网将分布在不同房间的5台计算机接入Internet,并且ISP只给其分配一个IP地址。在这种情况下,应该选用的网络互连设备是______。 A.无线AP B.无线交换机 C.无线网桥 D.无线路由器
单选题PC机不能接入因特网,这时采用抓包工具捕获的以太网接口发出的信息如图所示。可以看出该PC机的IP地址为______,默认网关的IP地址为______。PC不能接入Internet的原因可能是______。
单选题在SNMPv2协议中共有6种协议数据单元(PDU),某台管理站可以利用______PDU将有关的管理信息告诉另一台管理站。
单选题在Linux操作系统中,______文件负责配置DNs,它包含了主机的域名搜索顺序和DNS服务器的地址。 A./etc/hostname B./etc/host.conf C./etc/resolv.conf D./etc/name.conf
单选题某大中型企业的人事部、财务部、市场部、产品部的IP地址块分别为211.168.15.192/26、211.168.15.128/26、211.168.15.160/27和211.168.15.224/27。如果进行路由汇聚,能覆盖这4条路由的地址是______。 A.211.168.15.0/24 B.211.168.15.0/25 C.211.168.15.128/25 D.211.168.15.128/26
单选题通过 Samba 组件实现Linux 与Windows 文件资源共享时,需要提供的守护进程(daemon)是( ) 。
单选题5个64kb/s的信道按统计时分多路复用在一条主线路上传输,主线路的开销为4%,假定每个子信道利用率为90%,那么这些信道在主线路上占用的带宽为( )kb/s.
单选题若某通信链路的数据传输速率为2400bps,采用4相位调制,则该链路的波特率是______。
单选题某工程计划如图2-2所示,各个作业所需的天数如表2-1所示,设该工程从第0天开工,则作业Ⅰ最迟应在第{{U}}{{/U}}天开工。表2-1各个作业所需天数表作业ABCDEFGHIJ所需天数87911845428A.11B.13C.14D.16
单选题In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. The purpose of the testing phase of software development is not to{{U}} (21) {{/U}}the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one's intuitive notion of a successful test of a piece of{{U}} (22) {{/U}}; however, a successful test is one in which errors have been found, net one in which no errors have been detected. There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through{{U}} (23) {{/U}}, team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team. After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the{{U}} (24) {{/U}}number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the{{U}} (25) {{/U}}of each module, but also the "rippling effects" of errors, and the interfaces among modules.
单选题在下列选项中,属于IIS 6.0提供的服务组件是_______。
单选题把子网掩码为255.255.0.0的网络36.28.0.0分为两个子网,若第一个子网地址为36.28.64.0/18,则第二个子网地址为 (50) 。
