●Transport gateways connect byte streams in the transport layer．Application gateways allow interworking above (72) ．(72) A．network layerB．data link layerC．transport layerD．appfication layer

题目

●Transport gateways connect byte streams in the transport layer．Application gateways allow interworking above (72) ．

(72) A．network layer

B．data link layer

C．transport layer

D．appfication layer

相似考题

1.LANs can be connected by using bridges, which operate in theA．physical layerB．data link layerC．network layerD．transport layer

2.● 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. numbersB. connectionsC. diagramsD. resources（72）A. procedureB. functionC. routeD. flow（73）A. pathB. windowC. frameD. diagram（74）A. packetB. timeC. errorD. phase（75）A. portsB. streamsC. packetsD. cells

3.● A glue that holds the whole Internet together is the network layer protocol,(71). Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind. Its job is to provide a -(72) way to transport datagrams from source to destination, without regard to whether these machines are on the same network or whether there are other networks in between them.Communication in the Internet works as follows. The (73)layer takes data streams and breaks them up into datagrams. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. When all the pieces finally get to the destination machine, they are reassembled by the(74) layer into the original datagram. This datagram is then handed to the transport layer, which inserts it into the receiving process' input stream.An IP datagram consists of a header part and a text part. The header has a (75) part and a variable length optional part.(71) A. IP (Internet Protocol)B. IP (Interworking Protocol)C. TCP (Transport Control Protocol)D. TCP (Transfer Communication Protocol)(72) A. best-qualityB. quality-guaranteedC. connection-orientedD. best-efforts(73) A. data linkB. transportC. networkD. application(74) A. data linkB. transportC. networkD. application(75) A. 40-byte fixedB. 64-byte fixedC. 20~64 bytes variableD. 20-byte fixed

4.●The Simple Network Management Protocol (SNMP)is an (71) protocol that facilitates the exchange of management information between (72) ．It is part of the Transmission Control Protocol/Internet Protocol(TCP/IP) protocol suite．SNMP enables network (73) to manage network performance, find and sole network problems,and plan for (74) ．An SNMP-managed network consists of three key components:managed devices , (75) ,and network-management systems ．(71) A．Physical LayerB．Link LayerC．Network LayerD．Transport Layer(72) A．network stationsB．network clientsC．network devicesD．network servers(73) A．serversB．administratorsC．computersD．routers(74) A．network growthB．network structureC．network architectureD．network servers(75) A．administratorsB．agentsC．managersD．servers

更多“●Transport gateways connect byte streams in the transport layer．Application gateways allow interworking above (72) ．(72) A．network layerB．data link layerC．transport layerD．appfication layer”相关问题

  • 第1题：

    Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above

    A．network layer

    B．data link layer

    C．transport layer

    D．application layer


    正确答案：C

  • 第2题：

    is the 4th layer of the OSI reference model responsible for reliable network communication between end nodes.

    A．Data link layer

    B．Session layer

    C．Transport layer

    D．Application layer


    正确答案：C
    解析：四个选项分别是数据链路层、会话层、传输层和应用层。其中传输层位于OSI七层参考模型中的第四层，其功能之一是为会话层实体提供透明、可靠的数据传输服务。

  • 第3题：

    ● TCP/IP communication protocol contains four layers. From bottom to top, the four layers are __(71)__.

    （71）A．network interface layer, internet layer, transport layer and application layer

    B．internet layer, network interface layer, transport layer and application layer

    C．network interface layer, transport layer, network interface layer and application layer

    D．application layer, transport layer, internet layer and network interface layer


    正确答案：A

  • 第4题：

    ● The TCP protocol is a __（72）__ layer protocol．

    （72） A． physical B． network C． transport D． application


    正确答案：C
    TCP协议是传输层的协议。

  • 第5题：

    Which layer-function is mostly implemented in a network adapter（ ）。

    A.Physical layer and link layer

    B.Network layer and transport layer

    C.Physical layer and network layer

    D.Transport layer and application layer


    正确答案：A

  • 第6题：

    Together with the network layer,the transport layer is the heart of the protocol（ ）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 A.packet B.data C.command D.record A.connection B.terminal C.source D.destination A.traffic B.connection C.lines D.networks A.network B.transport C.link D.physical


    正确答案：C,A,C,D,B

  • 第7题：

    At which layers of the OSI model do WANs operate (Choose two.)()。

    A.application layer

    B.session layer

    C.transport layer

    D.network layer

    E.datalink layer

    F.physical layer


    参考答案：E, F

  • 第8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．reapers

    B．relays

    C．connects

    D．modems


    正确答案：A

    网络可以用不同的设备互联。在物理层，用中继器或者集线器互联，这些设备只是在相同的网络之间传送比特串。在上面的数据链路层，可以使用网桥或者交换机，这些设备接收数据帧，检查MAC地址，并可以实瑰少量的协议转换，把数据帧转发到不同的网络中。在网络层，使用路由器连接两个网络。如果两个网络的网络层不同，路由器能够对分组格式进行转换。在传输层，使用传输网关，它可以在两个传输连接之间建立接口。最后，在应用层，应用网关实现消息语法之间的翻译。例如，在Internet邮件和X．400邮件之间的网关可以对邮件报文进行语法分析，对报文的各个头字段做出改变。

  • 第9题：

    ● Each machine supporting TCP has a TCP transport entity, either a library procedure, a user process, or part of the kernel. In all case, it manages TCP streams and （71） to the IP layer. A TCP （72） accepts user data streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP （73） . When datagrams containing TCP data arrive at a machine, they are given to the TCP entity, which reconstructs the original byte streams. The IP layer gives no guarantee that datagrams will be delivered properly, so it is up to TCP to time out and （74） them as need be. Datagrams do arrive may well do so in the wrong order, it is also up to TCP to （75） them into messages in the proper sequence.

    （71）

    A. calls

    B. interfaces

    C. links

    D. produces

    （72）

    A. connection

    B. file

    C. entity

    D. destination

    （73）

    A. datagram

    B. stream

    C. connection

    D. transaction

    （74）

    A. reassemble

    B. reduce

    C. re-create

    D. retransmit

    （75）

    A. reassemble

    B. reduce

    C. re-create

    D. retransmit


    正确答案：B,C,A,D,A

  • 第10题：

    Networks can be interconnected by different devices in the physical layer networks can be connected by（ ）_or hubs.which just move the bits from one network to an identical network.One layer up we find bridges and switches which operate at data link layer.They can accept（ ）examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer,we have routers that can connect two networks,If two networks have（ ）network layer,the router may be able to translate between the packer formats.In the transport layer we find transport gateway,which can interface between two transport connections Finally,in the application layer,application gateways translate message（请作答此空）.As an example,gateways between Internet e-mail and X.400 e-mail must（ ）the e-mail message and change various header fields.

    A.syntax
    B.semantics
    C.language
    D.format

    答案：B
    解析：

  • 第11题：

    Both TCP and UDP belong to ( ) layer of the OSI mode。

    A.session
    B.transport
    C.network
    D.data link

    答案：B
    解析：
    翻译：

    TCP and UDP都属于OSI网络模型中的（ ）。

    A. 会话层 B. 传输层 C. 网络层 D. 数据链路层

  • 第12题：

    When gateways are registering with a gatekeeper， the gatekeeper can be（）.

    • A、On the same subnet
    • B、On a remote LAN
    • C、In a different subnet
    • D、Any of the above

    正确答案:D

  • 第13题：

    Networks can be interconnected by different devices in the physical layer networks can be connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link layer．They can accept (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe packer formats．In the transport layer we find transport gateway，which can interface between two transport connections Finally，in the application layer，application gateways translate message (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

    (68)

    A．reapers

    B．relays

    C．packages

    D．modems


    正确答案：A

  • 第14题：

    Each machine supporting TCP has a TCP transport entity, either a library procedure, a user process, or part of the kernel. In all case, it manages TCP streams and (71) to the IP layer. A TCP (72) accepts user data streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP (73). When datagrams containing TCP data arrive at a machine, they are given to the TCP entity, which reconstructs the original byte streams.The IP layer gives no guarantee that datagrams will be delivered properly, so it is up to TCP to time out and (74) them as need be. Datagmms do arrive may well do so in the wrong order, it is also up to TCP to (75) them into messages in the proper sequence.

    A．calls

    B．interfaces

    C．links

    D．produces


    正确答案：B

  • 第15题：

    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


    正确答案：A

  • 第16题：

    ● A transport layer protocol usually has several responsibilities. One is to create a process-to-process communication; UDP uses （71） numbers to accomplish this. Another responsibility is to provide control mechanisms at the transport level. UDP does this task at a very minimal level. There is no flow control mechanism and there is no （72） for received packet. UDP,however, does provide error control to some extent. If UDP detects an error in the received packet, it will silently drop it．

    The transport layer also provides a connection mechanism for the processes. The （73） must be able to send streams of data to the transport layer. It is the responsibility of the transport layer at （74） station to make the connection with the receiver, chop the stream into transportable units,number them, and send them one by one. It is the responsibility of the transport layer at the receiving end to wait until all the different units belonging to the same process have arrived, check and pass those that are （75） free, and deliver them to the receiving process as a stream.

    （71）A．hop B．port C．route D．packet

    （72）A．connection B．window C．acknowledgement D．destination

    （73）A．jobs B．processes C．programs D．users

    （74）A．sending B．routing C．switching D．receiving

    （75）A．call B．state C．cost D．error


    正确答案：B,C,B,A,D

  • 第17题：

    LANs can be connected by using bridges, which operate in the(67).

    A．data-link layer

    B．Physical layer

    C．network layer

    D．transport layer


    正确答案：A
    解析：译文：局域网可以使用网桥连接起来，它在数据链路层操作。

  • 第18题：

    At which layers of the OSI model do WANs operate?()

    A.application layer

    B.session layer

    C.transport layer

    D.network layer

    E.datalink layer

    F.physical layer


    参考答案：E, F

  • 第19题：

    ● Networks can be interconnected by different devices. In the physical layer，networks can be connected by（1）or hubs，which just move the bits from one network to an identical network. One layer up we find bridges and switches，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 routers that can connect two networks. 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 can interface between 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.

    （1）

    A.reapers

    B.relays

    C.connectors

    D.modems

    （2）

    A.frames

    B.packets

    C.packages

    D.cells

    （3）

    A.specia l

    B.dependent

    C.similar

    D.dissimilar

    （4）

    A.syntax

    B.semantics

    C.language

    D.format

    （5）

    A.analyze

    B.parse

    C.delete

    D.create


    正确答案：B,A,D,B,B
    网络能通过各种各样的设备进行互连。在物理层，网络是通过中继器或集线器连接起来，主要实现把比特从一个网络传输到另一个同样的网络。在物理层的上面，网桥和交换机工作在数据链路层。它们能够接受帧，检测MAC地址，当在传输过程中采用底层协议时，把这些数据帧传送到一个不同的网络。在网络层，路由器可以连接两个网络。如果两个网络有不相同的网络层，路由器能够实现数据包的格式转换。在传输层，有能实现连接网络传输层的连接网关。最后在应用层，应用网关能转换消息的语义。比如，在E-mail 和 X.400 E-mail之间的网关必须要解析E-mail消息和改变不同的标题域。

  • 第20题：

    Which OSI layer does a bridge operate at?

    A．the Physical Layer

    B．the Network Layer

    C．the Transport Layer

    D．the Data Link Layer


    正确答案：D

  • 第21题：

    TCP/IP communication protocol contains four layers. From bottom to top, the four layers are （ ） .

    A.network interface layer—internet layer—transport layer—application layer
    B.internet layer —network interface layer—transport layer—application layer
    C.network interface layer—transport layer —network interface layer—application layer
    D.application layer—transport layer —internet layer—network interface layer

    答案：A
    解析：

  • 第22题：

    Which layer-function is mostly implemented in a network adapter?（ ）.

    A.Physical layer and link layer
    B.Network layer and transport layer
    C.Physical layer and.network layer
    D.Transport layer and application layer

    答案：A
    解析：
    解析：翻译：网卡通常作用于（ ）？A．物理层和数据链路层B．网络层和传输层C．物理层和网络层D．传输层和应用层

  • 第23题：

    The TCP/IP stack is a complete set of networking protocols.The OSI Model was meant to be a standardized way of connecting devices together,and most protocols have some direct correlation to the OSI Model.The OSI Model has 7 layers,the fourth layer is called______.

    A.physical layer
    B.data link layer
    C.application layer
    D.transport layer

    答案：D
    解析：

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