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单选题
A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) 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.
空白（4）处应选择（）
A
packet
B
time
C
error
D
phase
参考答案
参考解析
解析：
传输层协议有多个职责。一是创建进程到进程（程序到程序）的通信，由TCP使用端口号来完成；另一个职责是在传输层创建流和差错控制机制。TCP利用滑动窗口协议来实现流控制。它使用确认分组、超时、重传机制来完成差错控制。传输层也负责为应用程序提供连接机制，应用程序将数据流发送到传输层，发送端的传输层负责建立于接收端之间的连接。
更多 “单选题A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) 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. 空白（4）处应选择（）A packetB timeC errorD phase” 相关考题
考题
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考题
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考题
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考题
Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?A．FTPB．TFTPC．SMTPD．TelnetE．DNS
考题
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考题
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考题
● The TCP protocol is a __（72）__ layer protocol．（72） A． physical B． network C． transport D． application
考题
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考题
TCP/IP communication protocol contains four layers． From bottom to top, the four layers are __（71）__．A.network interface layer, internet layer, transport layer and application layerB.internet layer, network interface layer, transport layer and application layerC.network interface layer, transport layer, network interface layer and application layerD.application layer, transport layer, internet layer and network interface layer
考题
When an IP packet is Layer 3－switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? ()
A. Layer 2 TTLB. Layer 3 TTLC. Layer 3 source addressD. Layer 3 transport protocolE. Layer 3 destination address
考题
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．reapersB．relaysC．connectsD．modems
考题
TCP/IP（ ）layer protocols provide services to the application（ ）running on a computer.The application layer does not define the application itself,but rather it defines（ ）that applications need--like the ability to transfer a file in the case of HTTP.In short,the application layer provides an（ ）between software running on a computer and the network itself.The TCP/IP application layer includes a relatively large number of protocols,with HTTP being only one of those.The TCP/IP（请作答此空）layer consists of two main protocol options--the Transmission Control Protocol（TCP）and the User Datagram Protocol（UDP）.A.application
B.session
C.physical
D.transport
考题
Together with the network layer,the transport layer is the heart of the protocol ( 请作答此空).The network layer provides end-to-end () delivery using datagrams or virtual circuits.The transport layer builds on the network layer to provide data transport from a process on a () machine to a process on a destination machine with a desired level of reliability that is independent of the physical () currently in use.It provides the abstractions that applications nedd to use the network..Without the () layer,the whole concept of layered protocols would make little sense.A.transport
B.network
C.hierarchy
D.service
考题
The TCP protocolis a （71） layer protocol. Each connection connects two TCPs that may be just one physical network apart or located on opposite sides ofthe globe.A.physical
B.network
C.transport
D.application
考题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）A、Layer 2 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 transport protocolE、Layer 3 destination address
考题
Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）A、FTPB、TFTPC、SMTPD、TelnetE、DNS
考题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）A、Layer 2 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 transport protocolE、Layer 3 destination address
考题
Which three statements about firewall modes are correct？ （）A、 A firewall in routed mode has one IP addressB、 A firewall in transparent mode has one IP addressC、 In routed mode， the firewall is considered to be a Layer 2 dewD、 In routed mode， the firewall is considered to be a Layer 3 deviceE、 In transparent mode， the firewall is considered to be a Layer 2 deviceF、 In transparent mode， the firewall is considered to be a Layer 3 device
考题
Which of the following is a connectionless transport layer protocol？（）A、 TCPB、 HTTPC、 SMTPD、 UDP
考题
Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true?（）A、The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.B、The DHCP Discover message uses UDP as the transport layer protocol.C、The DHCP Discover message uses a special Layer 2 multicast address as the destination address.D、The DHCP Discover message uses TCP as the transport layer protocol.E、The DHCP Discover message does not use a Layer 2 destination address.F、The DHCP Discover message does not require a transport layer protocol.
考题
Which of the following is a connection oriented transport layer protocol？ （）A、 TCPB、 UDPC、 TFTPD、 SNMP
考题
单选题Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）A
FTPB
TFTPC
SMTPD
TelnetE
DNS
考题
单选题A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) 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.
空白（1）处应选择（）A
numbersB
connectionC
diagramsD
resources
考题
单选题Which of the following is a connection oriented transport layer protocol？ （）A
TCPB
UDPC
TFTPD
SNMP
考题
单选题Which of the following is a connectionless transport layer protocol？（）A
TCPB
HTTPC
SMTPD
UDP
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