根据下面的文字资料回答 71~75 题 In the following essay,each blank has four choices.Choose the most suitable one from the four choices and write down in the answer sheet.A( 1 )is basically an end point of a communication link between two applications.Sockets that extend over a network connect two or more applications running on separate computer sat tached to the network.Asocket( 2 )twoaddresses:( 3 ).Sockets providea ( 4 )communication channel between one or more systems.There are stream and datagram sockets separately using TCP and( 5 ).
第6题:文中( 1 )处正确的答案是( )。
A.program
B.UDP
C.socket
D.TCP
第1题:
根据材料回答71~75题:
第2题:
根据下面的文字资料回答 71~75 题 The purpose of the requirements definition phase is to produce a clear,complete,consistent,and testable( 1 )of the technical requirements for the software produet.
During the requirements definition phase,the requirements deftnifion team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specificationof each function that the software must perform. and each( 2 )that it must meet.The starting point is usually a set of high-level requirements from the( 3 )that describe the project or problem.
In either case,the requirements definition team formulates an overall concept for the system and thedefines( 4 )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( 5 )requirements for the system from the highlevel requirements and the systern operations concept.Using structured or object-oriented analysis,the team specifies the software functions and algorithms needed to satisfy each detailedrequirements.
第71题:文中( 1 )处正确的答案是( )。
A.function
B.definition
C.specification
D.statement
第3题:
第4题:
根据下列选项请回答 71~75 题:
第 71 题 血红蛋白异常
第5题:
根据下面的文字资料回答 71~75 题 connected by( 1 )or Hubs,which just move the bits from one network to an identical network. One layer up we find bridgas and swiehes,which operate at data link layer. They can accept ( 2 ) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer,we have touters that can connect two netwoks. If two networks have( 3 )network layer,the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which cart interface between the two transport connections. Finally, in the application layer, application gateways translate message( 4 ). As an example,gateways between Internet e-mail and X.400 e-mail must ( 5 )the e-mail message and change various header fields.
第6题:文中( 1 )处正确的答案是( )。
A.reapers
B.relays
C.connects
D.modems
网络可以用不同的设备互联。在物理层,用中继器或者集线器互联,这些设备只是在相同的网络之间传送比特串。在上面的数据链路层,可以使用网桥或者交换机,这些设备接收数据帧,检查MAC地址,并可以实瑰少量的协议转换,把数据帧转发到不同的网络中。在网络层,使用路由器连接两个网络。如果两个网络的网络层不同,路由器能够对分组格式进行转换。在传输层,使用传输网关,它可以在两个传输连接之间建立接口。最后,在应用层,应用网关实现消息语法之间的翻译。例如,在Internet邮件和X.400邮件之间的网关可以对邮件报文进行语法分析,对报文的各个头字段做出改变。