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● A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port （71） to accomplish this. Another responsibility of a transport layer protocol is to create a （72） and error-
题目
● A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication; TCP uses port （71） to accomplish this. Another responsibility of a transport layer protocol is to create a （72） and error-control mechanism at the transport level. TCP uses a sliding （73） protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve （74） control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends （75） of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
（71）
A. numbers
B. connections
C. diagrams
D. resources
（72）
A. procedure
B. function
C. route
D. flow
（73）
A. path
B. window
C. frame
D. diagram
（74）
A. packet
B. time
C. error
D. phase
（75）
A. ports
B. streams
C. packets
D. cells
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第1题：
Acknowledgements, sequencing, and flow control are functions that are handled by which layer of the OSI model?
A. Layer 5
B. Layer 4
C. Layer 7
D. Layer 6
E. Layer 3
F. Layer 2
G. Layer 1
正确答案：B
B -
第2题：
OSI参考模型有哪些层，按顺序()。
A.Application、session、transport、network、physical、physical、datalink
B.Application、presentation、session、network、transport、datalink,physical
C.Application、presentation、session、transport、network、datalink、physical
D.Application、session、transport、physical、network、physical、datalink
正确答案：C
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第3题：
The Hypertext Transfer Protocol , the Web's (请作答此空) protocol , is at the heart of the Web. HTTP is implemented in two programs : a ( ) program and a server program . The client program and server program executing on different end systems , talk to each other by ( ) HTTP messages . HTTP defines how Web clients request Web pages from servers and how servers transfer web pages to clients . when a user ( ) a web page , the browser sends http request messages for the objects in the page to the server . The server ( ) the requests and responds with http response messages that contain the objects .A.transport-layer
B.application-layer
C.network-layer
D.link-layer答案：B解析：Web的应用层协议是超文本传输协议，是web核心。HTTP在两类程序（客户端程序、服务器端程序）中执行。客户端程序、服务器端程序在不同的终端系统中执行，通过交换HTTP消息来进行交互。HTTP定义了Web客户端如何从服务器端请求Web页面以及服务器端如何传送Web页面到服务器。当用户请求一个web页面，浏览器发送页面对象的http请求给服务器。服务器接收请求并用包含对象的http消息进行响应。 -
第4题：
Several@functionscanexecutemultiplestatements.Whichoneofthefollowinginitializesavariableandcanincrementinduringtheoperation?()A.@do
B.@for
C.@while
D.@dowhile
参考答案：B
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第5题：
Acknowldgement, Sequencing, and Flow control are characteristics of which OSI layer?()A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5
E. Layer 6
F. Layer 7
参考答案：C
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第6题：
The Hypertext Transfer Protocol,the Web's（请作答此空）protocol,is at the heart of the Web.HTTP is implemented in two programs:a（ ）program and a server program.The client program and server program executing on different end systems,talk to each other by（ ）HTTP messages.HTTP defines how Web clients request Web pages from servers and how servers transfer web pages to clients.when a user（ ）a web page,the browser sends http request messages for the objects in the page to the server.The server（ ）the requests and responds with http response messages that contain the objects.A.transport-layer
B.application-layer
C.network-layer
D.link-layer答案：B解析：Web的应用层协议是超文本传输协议，是web核心。HTTP在两类程序（客户端程序、服务器端程序）中执行。客户端程序、服务器端程序在不同的终端系统中执行，通过交换HTTP消息来进行交互。HTTP定义了Web客户端如何从服务器端请求Web页面以及服务器端如何传送Web页面到服务器。当用户请求一个web页面，浏览器发送页面对象的http请求给服务器。服务器接收请求并用包含对象的http消息进行响应。