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●LANs can be connected by using bridges，which operate in the (67) .
(67) A．data-link layer
B．Physical layer
C．network layer
D．transport layer
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LANs can be connected by using bridges, which operate in theA．physical layerB．data link layerC．network layerD．transport layer
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is a channel' s capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.(68)is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69)．is the popular LAN develped under the direction of the IEEE 802.3.(70)is a device which enables digital microcomputers to communicate across analog telephone lines.A．The volumeB．The bandwidthC．The noiseD．The delay
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LANs can be connected by using bridges, which operate in the(67).A．data-link layerB．Physical layerC．network layerD．transport layer
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With regard to bridges and switches, which of the following statements are true?()
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Which of the following statements are true regarding bridges and switches (Choose 3.)()。
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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
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Which OSI layer does a bridge operate at?A．the Physical LayerB．the Network LayerC．the Transport LayerD．the Data Link Layer
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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
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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
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At which layer of the OSI model does the Spanning Tree Protocol （STP） operate at？（）A、Layer 5B、Layer 4C、Layer 3D、Layer 2E、Layer 1
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At which of the following layers does the UDP protocol operate?（）A、Layer 1B、Layer 4C、Layer 6D、Layer 7
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多选题Which of the following statements are true regarding bridges and switches? (Choose 3.)（）ASwitches are primarily software based while bridges are hardware based.BBoth bridges and switches forward Layer 2 broadcasts.CBridges are frequently faster than switches.DSwitches have a higher number of ports than most bridges.EBridges define broadcast domains while switches define collision domains.FBoth bridges and switches make forwarding decisions based on Layer 2 addresses.
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多选题With regard to bridges and switches, which of the following statements are true?（）ASwitches are primarily software based while bridges are hardware based.BBoth bridges and switches forward Layer 2 broadcasts.CBridges are frequently faster than switches.DSwitches typically have a higher number of ports than bridges.EBridges define broadcast domain while switches define collision domains.FBoth bridges and switches make forwarding decisions based on Layer 2 addresses.
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