● 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 lay

题目

● 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

相似考题

1.● (74) functions with two layers of protocols．It can connect networks of different speeds and can be adapted to an environment as it expands．(74) A．The hubB．The bridgeC．The routerD．The proxy

2.●Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) 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 (67) ，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 netwoks．If two networks have (68) 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 the two transport connections．Finally，in the application layer，application gateways translate message (69) ．As an example，gateways between Internet e-mail and X．400 e-mail must (70) the e-mail message and change various header fields．(66) A．reapersB．relaysC．connectsD．modems(67) A．framesB．bytesC．packagesD．cells(68) A．specialB．dependentC．similarD．dissimilar(69) A．syntaxB．semanticsC．languagesD．format(70) A．analyzeB．pairsC．deleteD．create

3.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．reapersB．relaysC．packagesD．modems

4.●Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.(73) A．structuresB．topologiesC．protocolsD．frames

参考答案和解析
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。
更多“● Networks can be interconnected by different devices. In the physical layer,networks can ”相关问题

  • 第1题：

    ● OSI is a theoretical model that shows how any two different systems can communicate with each other．Router, as a networking device, operate at the (71) layer of the OSI model．

    (71)

    A．transport

    B．application

    C．network

    D．physical


    正确答案：C
    试题（71）分析
     OSI是Open System Interconnect的缩写，意为开放式系统互联。国际标准组织制定了OSI模型。这个模型把网络通信的工作分为7层，分别是物理层、数据链路层、网络层、传输层、会话层、表示层和应用层。
     Router路由器，是运行在OSI中网络层network上的网络通信设备，而不是传输层transport layer，应用层application layer，及物理层physical layer，因此选C
    参考答案
    （71）C

  • 第2题：

    Communication networks can be classified in terms of their physical arrangement or(74). Three common(74)are the star, bus, and ring.

    A．structures

    B．topologies

    C．protocols

    D．frames


    正确答案：B
    解析：信息网络可以依据物理结构或拓扑结构进行分类，3个典型的拓扑结构是星形、总线型和环形。

  • 第3题：

    Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)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(67), 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(68)network layer, the router may be able to translate between the packet formats. In the transport layer we fmd transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message(69). As an example, gateways between Internet e-mail and X.400 e-mail must(70)the e-mail message and change various header fields.

    A．repeaters

    B．relays

    C．connectors

    D．modems


    正确答案：A
    解析：网络可以用不同的设备互连。在物理层，用中继器或集线器互连，这些设备只是在相同的网络之间传关比特串。在上面的数据链路层，可以使用网桥或交换机，这些设备接收数据帧，检查MAC地址，并可以实现少量的协议转换，把数据帧转发到不同的网络中。在网络层，我们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，我们使用传输网关，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，对报文的各个报头字段做出改变。

  • 第4题：

    OSI is a theoretical model that shows how any two different systems can communicate with each other. Router, as a networking device, operate at the ______ layer of the OSI model.

    A．transport

    B．application

    C．network

    D．physical


    正确答案：C

  • 第5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.

    A.repeaters
    B.relays
    C.connectors
    D.modems

    答案：A
    解析：
    学好英语，一切都很简单。

  • 第6题：

    For each blank，choose the best answer from the four choices and write down on the answer sheet.
    （ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
    （ ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
    （请作答此空）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
    （ ）is the popular LAN developed under the direction of the IEEE 802.5.
    （ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

    A.The hub
    B.The bridge
    C.The router
    D.The proxy

    答案：B
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
    IEEE是由多个研究底层协议的机构组成的权威组织。
    以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
    令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
    光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
    较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
    具有较大的带宽，FDDI的设计带宽为100Mbit/s。
    具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
    光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第7题：

    The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?（）

    • A、1 network with 254 hosts
    • B、4 networks with 128 hosts
    • C、2 networks with 24 hosts
    • D、6 networks with 64 hosts
    • E、8 networks with 36 hosts

    正确答案:A

  • 第8题：

    How could a large corporation with many specialized divisions benefit from using VLANs on their networks?（）

    • A、VLANs allow access to network services based on department, not physical location.
    • B、VLANs utilize packet filtering to enhance network security.
    • C、VLANs provide a low-latency, high bandwidth internetworking alternative.
    • D、VLANs provide a method of communication between IP addresses in large networks.
    • E、VLANs establish segmented broadcast domains in switched networks.
    • F、VLANs can greatly simplify adding, moving, or changing hosts on the network.

    正确答案:A,E,F

  • 第9题：

    Which statements are valid for a local SPAN configuration？ （）

    • A、 Source and destination interface must be on the same host
    • B、 Source and destination interfaces can be on different hosts
    • C、 Destination vEthernet interface can be on a different VLAN than the source
    • D、 Destination interface can be a physical port
    • E、 Destination interface cannot be a physical port

    正确答案:A,D

  • 第10题：

    多选题
    Overlay Transport Virtualization （OTV） join interface is used to source the OTV encapsulated traffic and send it to the Layer 3 domain of the data center network. Which statements are true about OTV join interface？ （）
    A

    Join interface is a Layer 3 entity， and with the Cisco NX-OS release 6.0， it can only be defined as a physical interface， physical subinterface， Layer 3 port channel， or Layer 3 port channel subinterface.

    B

    A single join interface can be defined and associated with a given OTV overlay.

    C

    Multiple overlays can also share the same join interface.

    D

    Join interface can be a loopback interface.

    E

    The join interface is a Layer 3 entity that can be defined as a physical interface but not as a logical one.


    正确答案： D,B
    解析： 暂无解析

  • 第11题：

    多选题
    How could a large corporation with many specialized divisions benefit from using VLANs on their networks?（）
    A

    VLANs allow access to network services based on department, not physical location.

    B

    VLANs utilize packet filtering to enhance network security.

    C

    VLANs provide a low-latency, high bandwidth internetworking alternative.

    D

    VLANs provide a method of communication between IP addresses in large networks.

    E

    VLANs establish segmented broadcast domains in switched networks.

    F

    VLANs can greatly simplify adding, moving, or changing hosts on the network.


    正确答案： B,D
    解析： 暂无解析

  • 第12题：

    单选题
    The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?（）
    A

    1 network with 254 hosts

    B

    4 networks with 128 hosts

    C

    2 networks with 24 hosts

    D

    6 networks with 64 hosts

    E

    8 networks with 36 hosts


    正确答案： B
    解析： 暂无解析

  • 第13题：

    functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.

    A．The hub

    B．The bridge

    C．The router

    D．The proxy


    正确答案：B
    解析：译文：网桥涉及了两层网络协议，它能连接不同速度的网络。作为扩展，还可以改变以使用某个环境。

  • 第14题：

    Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communication(72) as they become available, and then reassembling the packets(73) they arrive at their destination. Prior to the development of packet switching, early computer networks used leased, dedicated telephone circuits to(74) with terminals and other computers. In circuit-switched networks such as the telephone system, a complete point-to-point(75) is put together, and then communication can proceed.

    A．binary

    B．useful

    C．digital

    D．analog


    正确答案：C

  • 第15题：

    The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?

    A．1 network with 254 hosts

    B．4 networks with 128 hosts

    C．2 networks with 24 hosts

    D．6 networks with 64 hosts

    E．8 networks with 36 hosts


    正确答案：A
    解析：Explanation:Asubnetwith24bitsonwouldbe255.255.255.0.SincethisisaclassCnetwork,thissubnetcanhaveonly1networkand254usablehosts.

  • 第16题：

    Routers perform the decision process that selects what path a packet takes. These （ ） layer devices participate it the collection and distribution of network-layer information, and perform Layer 3 switching based on the contents of the network layer （ ） of each packet. You can connect the routers directly by point-to-point （ ） or local-area networks, or you can connect them by LAN or WAN switches. These Layer 2 switches unfortunately do not have the capability to hold Layer 3 （ ） information or to select the path taken by a packet through analysis of its Layer 3 destination address. Thus, Layer 2 switches be involved in the Layer 3 packet （ ） decision process.

    A.application B. network C.physical D.link A.header B.connection C.protocol D.data A.medium B.links C.switches D.carriers A.network B.links C.protocol D.routing A.switching B.processing C.forwarding D.connecting


    正确答案：B,A,B,D,C

  • 第17题：

    For each blank，choose the best answer from the four choices and write down on the answer sheet.
    （ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
    （请作答此空）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
    （ ）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
    （ ）is the popular LAN developed under the direction of the IEEE 802.5.
    （ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

    A.ISO
    B.ANSI
    C.CCITT
    D.IEEE

    答案：D
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
    IEEE是由多个研究底层协议的机构组成的权威组织。
    以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
    令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
    光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
    较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
    具有较大的带宽，FDDI的设计带宽为100Mbit/s。
    具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
    光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第18题：

    What are three advantages of VLANs?（）

    • A、VLANs establish broadcast domains in switched networks.
    • B、VLANs utilize packet filtering to enhance network security.
    • C、VLANs provide a method of conserving IP addresses in large networks.
    • D、VLANs provide a low-latency internet working alternative to routed networks.
    • E、VLANs allow access to network services based on department, not physical location.
    • F、VLANs can greatly simplify adding, moving, or changing hosts on the network.

    正确答案:A,E,F

  • 第19题：

    Overlay Transport Virtualization （OTV） join interface is used to source the OTV encapsulated traffic and send it to the Layer 3 domain of the data center network. Which statements are true about OTV join interface？ （）

    • A、 Join interface is a Layer 3 entity， and with the Cisco NX-OS release 6.0， it can only be defined as a physical interface， physical subinterface， Layer 3 port channel， or Layer 3 port channel subinterface.
    • B、 A single join interface can be defined and associated with a given OTV overlay.
    • C、 Multiple overlays can also share the same join interface.
    • D、 Join interface can be a loopback interface.
    • E、 The join interface is a Layer 3 entity that can be defined as a physical interface but not as a logical one.

    正确答案:A,B,C

  • 第20题：

    Why can security on healthcare networks be an important issue for customers？（）

    • A、offers a rapid return on investment
    • B、telecommuting
    • C、multiple network connections
    • D、legal mandates

    正确答案:C

  • 第21题：

    多选题
    Which statements are valid for a local SPAN configuration？ （）
    A

    Source and destination interface must be on the same host

    B

    Source and destination interfaces can be on different hosts

    C

    Destination vEthernet interface can be on a different VLAN than the source

    D

    Destination interface can be a physical port

    E

    Destination interface cannot be a physical port


    正确答案： D,B
    解析： 暂无解析

  • 第22题：

    单选题
    The passage is primarily concerned with ______.
    A

    the etiquette of the eighteenth century

    B

    the ensuing romance between two people from different social classes

    C

    the lesson that one can never be too careful

    D

    the resilience of the human spirit to rise after a fall and adapt to new surroundings

    E

    the workings of social networks and importance of befriending the upper class


    正确答案： A
    解析：
    这篇文章主要是关于两个经历过经济困难上的女人慢慢适应社会并重新找到她们在社会上的位置。

  • 第23题：

    多选题
    What are three advantages of VLANs?（）
    A

    VLANs establish broadcast domains in switched networks.

    B

    VLANs utilize packet filtering to enhance network security.

    C

    VLANs provide a method of conserving IP addresses in large networks.

    D

    VLANs provide a low-latency internet working alternative to routed networks.

    E

    VLANs allow access to network services based on department, not physical location.

    F

    VLANs can greatly simplify adding, moving, or changing hosts on the network.


    正确答案： E,A
    解析： 暂无解析

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