发布时间 : 星期五 文章计算机网络英文题库(附答案)chapter3(推荐文档)更新完毕开始阅读29a7c5dcf56527d3240c844769eae009581ba2a4
B Point-to-point protocol
C Reliable, in-order byte steam protocol D Pipelined protocol
69. Which of the following about TCP is not correct? A It is a connectionless protocol B full duplex data transfer protocol C connection-oriented protocol D flow controlled protocol
70. The maximum amount of data that can be grabbed and placed in a segment is limited by the ____.
A Maximum segment size (MSS) B MTU
C Sequence number D Check sum
71. The MSS is typically set by first determining the length of the largest link-layer frame that can be sent by the local sending host (the so-called____), and then will fit into a single link-layer frame. A Maximum segment size (MSS) B MTU
C Sequence number D Check sum
72. The MSS is the maximum amount of ____layer data in the segment, not the maximum size of the TCP segment including headers. A Application B Transport C Networking D Link
73. Which of the following field is not used for connection setup and teardown? A Sequence number B TST C SYN D FIN
74. ____ is the byte stream number of first byte in the segment. A Sequence number B ACK number C Checksum D port number
75. ____ is the byte sequence numbers of next byte expected from other side. A Sequence number B ACK number C Checksum D port number
76. Because TCP only acknowledges bytes up to the first missing byte in the stream, TCP is said to provide ____ acknowledgements.
A Cumulative B Selective C Single D Negative
77. Fast retransmit means in the case that ____ duplicate ACK-s are received, the TCP sender resend segment before timer expires. A 3 B 4 C 5 D 6
78. TCP____ means sender won’t overflow receiver’s buffer by transmitting too much, too fast.
A Flow control
B Congestion control C Reliable data transfer
D Connection-oriented service
79. TCP provides flow control by having the sender maintain a variable called the ____.
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.
A sliding window B congestion window
C receive window D variable window
98. Flow control and congestion control are same at that they all limit the rate of the sender, but differ in that ____.
A flow control limits its rate by the size of RcvWindow, but congestion control by the traffic on the link
B congestion control limits its rate by the size of RcvWindow, but flow control by the traffic on the link
C flow control mainly is accomplished by the sender, but congestion control by the receiver.
D flow control mainly is accomplished by the receiver, but congestion control by