计算机网络英文题库(附答案)chapter3[稻谷书屋].doc
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1、Chapter 3 Transport Layer1. A transport-layer protocol provides for logical communication between _.A Application processesB HostsC RoutersD End systems2. Transport-layer protocols run in _.A ServersB ClientsC RoutersD End systems3. In transport layer, the send side breaks application messages into
2、_, passes to network layer.A FramesB SegmentsC Data-grams D bit streams4. Services provided by transport layer include _.A HTTP and FTPB TCP and IPC TCP and UDPD SMTP5. Which of the following services is not provided by TCP? A Delay guarantees and bandwidth guaranteesB Reliable data transfers and fl
3、ow controlsC Congestion controlsD In-order data transfers6. These two minimal transport-layer services-_ and _-are the only two services that UDP provides! A process-to-process data delivery, error checkingB congestion control, reliable data transferC flow control, congestion controlD In-order data
4、transfer, error checking7. Port numbers scope is _ to _. A 0, 1023B 0, 65535C 0, 127D 0,2558. The port numbers ranging from _to _ are called well-known port number and are restricted.A 0, 1023B 0, 65535C 0, 127D 0,2559. UDP socket identified by two components, they are _.A source IP addresses and so
5、urce port numbersB source IP addresses and destination IP addressesC destination IP address and destination port numbersD destination port numbers and source port numbers10. TCP socket identified by a (an) _. A 1-tupleB 2-tupleC 3-tupleD 4-tuple11. Which of the following applications normally uses U
6、DP services? A SMTPB Streaming multimediaC FTPD HTTP12.Reliabledatatransferprotocoloveraperfectlyreliablechannelis_.Ardt1.0Brdt2.0Crdt3.0Drdt2.113.Reliabledatatransferprotocoloverachannelwithbiterrorsandpacketlossesis_.Ardt1.0Brdt2.0Crdt3.0Drdt2.114.Whichofthefollowingaboutreliabledatatransferoverac
7、hannelwithbiterrorsisnotcorrect?ARDT2.0:assumingACKandNAKwillnotbecorruptedBRDT2.1:assumingACKandNAKcanbecorruptedCRDT2.2:onlyuseACK-sDRDT2.2:usebothACK-sandNAK-s15.Whichofthefollowingprotocolsisnotpipeliningprotocols?ATCP Brdt3.0CGO-BACK-N Dselectiverepeat16.WhichofthefollowingisnotcorrectaboutGBNp
8、rotocol?AOnlyusingACK-sBUsingcumulativeACK-sCReceiverdiscardsallout-of-orderpacketsDItisnotpipelinedprotocol17.WhichofthefollowingisnotcorrectaboutSRprotocol?AreceiverindividuallyacknowledgesallcorrectlyreceivedpacketsBsenderonlyresendspacketsforwhichACKnotreceivedCItlimitssequencenumberofsentbutun-
9、ACK-edpacketsDItisnotapipelinedprotocol18. Which of the following about TCP connection is not correct? A It is a broadcast connectionB It is a point-to-point connectionC It is a pipelined connectionD It is a full duplex connection19. The SYN segment is used for_. A TCP connection setupB TCP flow con
10、trolC TCP congestion controlD Closing a TCP connection20. The FIN segment is used for_.A TCP connection setupB TCP flow controlC TCP congestion controlD Closing a TCP connection21. How does TCP sender perceive congestion? A Through a timeout eventB Through a receiving duplicate ACK-s eventC Both A a
11、nd BD Either A or B22. Extending host-to-host delivery to process-to-process delivery is called transport-layer _ and . A multiplexing and de-multiplexingB storing and forwardingC forwarding and filteringD switching and routing23. UDP is a _ service while TCP is a connection-oriented service. A Conn
12、ectionlessB ReliableC Connection-orientedD In-order24. The UDP header has only four fields, they are_. A Source port number, destination port number, length and checksumB Source port number, destination port number, source IP and destination IPC source IP, destination IP, source MAC address and dest
13、ination MAC addressD source IP, destination IP, sequence number and ACK sequence number25. There are two 16-bit integers: 1110 0110 0110 0110, 1101 0101 0101 0101. Their checksum is_. A 0100010001000011B 1011101110111100C 1111111111111111D 100000000000000026. The maximum amount of data that can be g
14、rabbed and placed in a segment is limited by the_.A Maximum segment size (MSS)B MTUC ChecksumD Sequence number27. 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_.A Maximum transmission unit (MTU)B MSSC
15、 ChecksumD Sequence number28. A File size of 500,000bytes, MSS equals 1000bytes. When we want to transmit this file with TCP, the sequence number of the first segment is 0, and the sequence number of the second segment is _. A 1000B 999C 1001D 50000029. Because TCP only acknowledges bytes up to the
16、first missing byte in the stream, TCP is said to provide_. A Cumulative acknowledgementsB Selective acknowledgementsC 3 duplicate ACKsD positive ACKs30. Provided =0.125, current value of Estimated-RTT is 0.4s, Sample-RTT is 0.8s, then the new value of Estimated-RTT is _s. A 0.45B 0.6C 0.7D 0.831. Pr
17、ovided RcvBuffer=20,LastByteRcvd=20,LastByteRead=15, then RcvWindow=_. A 14B 15C 16D 1032. TCP service does not provide_. A Reliable data transfer B Flow controlC Delay guarantee D Congestion control33. There are two states in TCP congestion control, which are _. A slow start and congestion avoidanc
18、eB safe start and congestion avoidanceC slow start and congestion abandonD safe start and congestion abandon34. The transport-layer protocol provides logical communication between _, and the network-layer protocol provides logical communication _. A hosts, processes B processes, hostsC threads, proc
19、esses D processes, threads35.ToimplementthemulticastservicestheInternetemploysthe_protocol.AFTPBTCPCIGMPDUDP36. If an application developer chooses _ protocol, then the application process is almost directly talking with IP. A HTTPB RIPC CSMA/CDD UDP37. _ maintains connection-state in the end system
20、s. This connection state includes receive and send buffers, congestion-control parameters, and sequence and acknowledgment number parameters. A UDPB TCPC DNSD HTTP38. The host that initiates the session in the Internet is labeled as _.A server B user agentC clientD router39. With TCP there is no _ b
21、etween sending and receiving transport-layer entities. A flow control B handshakingC. congestion control D VC setup40. The Internets _ service helps prevent the Internet from entering a state of gridlock. A datagramB congestion controlC sliding window D timeout event41. Connection setup at the trans
22、port layer involves _. A server B only the two end systemsC client D router42. A _layer protocol provides for logical communication between applications. A transportB applicationC networkingD MAC43. In static congestion window, if it satisfies W*S/R RTT + S/R, the Latency is _. A W*S/R ( RTT+ S/R) B
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