发布时间 : 星期五 文章计算机网络英文题库(附答案)chapter3更新完毕开始阅读
A Receive window B Congestion window C Sliding window D buffer
80. How does TCP sender perceive congestion A Timeout
B 3 duplicate ACK-s C Both A and B D None of above
81. Transport protocols run in ____. A Servers B Clients C Routers D End systems
82. Which of the following services is not provided by TCP A Delay guarantees and bandwidth guarantees B Reliable data transfers and flow controls C Congestion controls D In-order data transfers
83. Which service does UDP not provide A multiplexing B de-multiplexing C error-detection D error-correction
84. There are three major events related to data transmission and retransmission in the TCP sender, which one is not in it A data received from application above
B de-multiplexing segment
C timer timeout D ACK receipt
85. Which of the following applications normally uses UDP services A SMTP
B Streaming multimedia C FTP D HTTP
86. Which of the following about TCP connection is not correct A It is a broadcast connection B It is a point-to-point connection C It is a pipelined connection D It is a full duplex connection 87. The SYN segment is used for____. A TCP connection setup B TCP flow control C TCP congestion control D Closing a TCP connection
88. Which service helps prevent the internet from entering a state of gridlock
A reliable data transfer B flow control
C congestion control D handshaking procedure
89. The Internet’s _____is responsible for moving packets from one host to another.
A application layer B transport layer
C network layer D link layer
90.In the following applications, which one is a bandwidth-sensitive
application
A E-mail
B web application C real-time audio D file transfer
91. In the following applications, which one uses UDP A E-mail
B web application C file transfer D DNS
92. In the following four descriptions, which one is correct
A If one host’s transport layer uses TCP, then its network layer must use virtual-circuit network.
B Datagram network provides connection service
C The transport-layer connection service is implemented in the router D The network-layer connection service is implemented in the router as well as in the end system.
93. ____ is a speeding-matching service---matching the rate which the sender is sending against the rate at which the receiving application is reading.
A congestion control B flow control
C sliding-window control D variable control
94. In the following four descriptions about Rcv-Window, which one is correct
A The size of the TCP RcvWindow never changes throughout the duration of the connection
B The size of the TCP RcvWindow will change with the size of the TCP RcvBuffer
C The size of the TCP RcvWindow must be less than or equal to the size of the TCP RcvBuffer
D Suppose host A sends a file to host B over a TCP connection, the number of unacknowledged bytes that A sends cannot exceed the size of the size of the RcvWindow.
95. There are 6 flag fields. Which one is to indicate that the receiver should pass the data to the upper layer immediately A PSH B URG C ACK D RST
96. Suppose the TCP receiver receives the segment that partially or completely fills in gap in received data, it will ____. A immediately send ACK B immediately send duplicate ACK
C wait some time for arrival of another in-order segment D send single cumulative
97. _____ imposes constrain on the rate at which a TCP sender can send traffic into the network.