单选题在某公司局域网中的一台Windows主机中,先运行______命令,再运行“arp-a”命令,系统显示的信息如下图所示。
单选题“science”是一个XML 元素的定义,其中元素标记的属性值是( ) 。
单选题在 xDSL 技术中,能提供上下行信道非对称传输的技术是( )。
单选题结构化布线系统分为六个子系统,其中水平子系统的作用是______,园区子系统的作用是______。
单选题存储器地址有很重要的作用,它的作用是 (5) 。 A.便于按照地址编号读写连续的数据 B.作为存储器中不同数据字的惟一标志 C.便于程序连续存放 D.作为区分地址中的数据和指令的标志
单选题以下选项中,属于著作财产权的是______。 A.发行权 B.署名权 C.保护作品完整权 D.修改权
单选题带32 MB Flash Memory数字录音机的应用程序占用1MB内存,其余存储空间用于存储声音数据。若该录音机采用G.723.1的声音编码标准(数据传输速率为5.3kb/s),则这种录音机最长的录音时间为 (11) 。
单选题边界网关协议BGP4被称为路径矢量协议,它传送的路由信息是由一个地址前缀后跟______组成。这种协议的优点是______。
单选题测试是保证软件质量的重要手段。根据国家标准GB 8566-88《计算机软件开发规范》的规定,应该在 (10) 阶段制定系统测试计划。
单选题The network layer provides services to the transport layer. It can be based on either ______. In both cases, its main job is ______ packets from the source to the destination.
In network layer, subnets can easily become congested, increasing the delay and ______ forpackets. Network designers attempt to avoid congestion by proper design. Techniques include ______ policy, caching, flow control, and more.
The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client, traffic shaping, resource ______, and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP),differentiated services,and MPLS.
单选题商业秘密是指不为公众所知悉,能为权利人带来经济效益,具有______并经权利人采取保密措施的技术信息和经营信息。 A.新颖性 B.实用性 C.创造性 D.前瞻性
单选题SNMP采用UDP提供的数据报服务传递信息,这是由于______。 A.UDP比TCP更加可靠 B.UDP数据报文可以比TCP数据报文大 C.UDP是面向连接的传输方式 D.UDP实现网络管理的效率较高
单选题假设在一个采用CSMA/CD协议的千兆网络中,传输介质是一根电缆。若要求最远的两个站点间距离增加lOOm,则该网络的最小数据帧长度应至少______才能保证网络正常工作。 A.减少500位 B.减少1000位 C.增加500位 D.增加1000位
单选题在一个单CPU 的计算机系统中,采用可剥夺式(也称抢占式)优先级的进程调度方案,且所有任务可以并行使用I/O 设备。下表列出了三个任务刊、T2, T3 的优先级、独立运行时占用CPU 和I/O 设备的时间。如果操作系统的开销忽略不计,这三个任务从同时启动到全部结束的总时间为__(9)__ms.CPU 的空闲时间共有__(10)__ms。
单选题
单选题用ping命令持续测试本机与路由器的连接时,使用Ping命令中 (13) 参数。 A.-a B.-n C.-1 D.-t
单选题问题还没有解决,测试人员新报告的缺陷,或验证后缺陷仍然存在,这些缺陷所处的状态是______。 A.激活状态 B.非激活状 C.己修正状态 D.关闭状态
单选题
单选题The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (71) of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each (72) that it must meet. The starting point is usually a set of high-level requirements from the (73) that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and the defines (74) showing how the system will be operated, publishes the system and operation concept documents, and conducts a system concept review(SCR). Following the SCR, the team derives (75) requirements for the system from the high level requirements and the system operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirements.
单选题可以管理系统时钟、进行错误检测、查看和保存配置文件、完成路由器的冷启动等操作的路由器工作模式______。