下面关于IPv6协议优点的描述中,准确的是(22)。
相邻层间交换的数据单元称为______。
利用VLAN技术可以把物理上连接的网络从逻辑上划分为多个不同的虚拟子网,可以对各个子网实施不同的管理策略。图5-4示意了交换机SW1和交换机SW2相连把6台计算机配置成2个VLAN。阅读SW1的部分配置信息,为(56)空缺处选择合适的命令/参数,实现交换机SW1的正确配置。SW1(vlan)#(56)SW1#showvtpstatusVTPversion:2ConfigurationRevision:0MaximumVLANssupportedlocally:64NumberofexistingVLANs:1VTPOperatingMode:ServerVTPdomainName:Server1VTPPruningMode:EnableVTPV2Mode:DisabledAtTPTrapsGeneration:Disabled
16个处理器的编号分别为0、1、2、3、…、15,采用全混洗单级互联函数(Shuffle)时,5号处理器与(1)号处理器相连接。
以太网的CSMA/CD协议采用坚持型监听算法。与其他监听算法相比,这种算法的主要特点是__________。(2008年上半年试题)
TCP/IP在多个层次引入了安全机制,其中TLS协议位于__________。(2008年下半年试题)
下列不是RPR的关键技术的是__________。
在计算机指令系统中,通常采用多种确定操作数的方式。当操作数直接给出时,这种寻址方式叫做(2);当操作数的地址由某个指定的变址寄存器的内容与位移量相加得到时,叫做(3);如果操作数的地址是主存中与该指令地址无关的存储单元的内容,则叫做(4)。
For each blank, choose the best answer from the four choices and write down on the answer sheet. (66) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string. (67) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection. (68) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable. (69) is a device used to connect two separate network that use different communication protocol. (70) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
下述任务中,(2)不属于软件工程需求分析阶段。
E1信道的数据频率是(1),其中的每个话音信道的数据速率是(2)。(2008年下半年试题)
若指令流水线把一条指令分为取指、分析和执行三部分,且这三部分的时间分别是 t取指=2 ns,t分析=2 ns,t执行=1 ns,则100条指令全部执行完中需______ns。
__________是支持电子邮件加密的协议。(2013年上半年试题)
在数字传输系统中传输的数字信号所代表的原始数据是__________。
以太网的最大帧长为1518字节,每个数据帧前面有8个字节的前导字段,帧间隔为9.6μs,对于10BASE-5网络来说,发送这样的帧需要多少时间?(64)
李某在《电脑与编程》杂志上看到张某发表的一组程序,颇为欣赏,就复印了一百份作为程序设计辅导教材发给学生。李某又将这组程序逐段加以评析,写成评论文章后投到《电脑编程技巧》杂志上发表。李某的行为__________。
The usual way to ensure reliable delivery is to provide the(11)with some feedback about what is happening at the other end of the line.Typically,the protocol calls for the receiver to send back special (12)flame bearing positive or negative (13)about the incoming flames.If the sender receives a positive.Acknowledgement about a flame,it knows the flame has arrived safely.On the other hand,a negative acknowledgement means that something has gone wrong,and the frame must be transmitted again.An additional complication comes from the possibility that hardware troubles may cause a flame to(14)completely.In this case,the receiver will not react at all,since it has no any reason to react.It should be clear that a protocol in which the sender transmits a frame and then waits for an acknowledgement,positive or negative,will hang forever if a flame is ever lost due to,for example,(15)handware.(2008年下半年试题)
我国互联网的发展启蒙于_______。
能检测出所有奇数个错、单比特错、双比特错和所有小于、等于校验位长度的突,发错的校验码是(37)。
以下域名服务器中,没有域名数据库的是__________。 (2010年上半年试题)