（）标记可以在用户浏览器不支持多窗口结构显示时，告知用户一些有关信息。A、＜FRAME＞＜/FRAME＞B、＜FRAMES＞＜/FRAMES＞C、＜NOFRAME＞＜/NOFRAME＞D、＜NOFRAMES＞＜/NOFRAMES＞
（）标记可以在用户浏览器不支持多窗口结构显示时，告知用户一些有关信息。
- A、＜FRAME＞＜/FRAME＞
- B、＜FRAMES＞＜/FRAMES＞
- C、＜NOFRAME＞＜/NOFRAME＞
- D、＜NOFRAMES＞＜/NOFRAMES＞
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How many expansion frames can be attached to an IBM TS3500 model L23 or L53 base frame? () A. 15B. 16C. 17D. 18
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Which two of these are characteristics of the 802.1Q protocol?() A. it is a layer 2 messaging protocol which maintains vlan configurations across network.B. it includes an 8-bit field which specifies the priority of a frame.C. it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.D. it modifies the 802.3 frame header,and thus requires that the FCS be recomputed.E. it is a trunking protocol capable of carring untagged frames.
What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table()。 A.The switch will not forward unicast frames.B.The switch will forward the frame to a specific port.C.The switch will return a copy of the frame out the source port.D.The switch will remove the destination MAC from the switch table.E.The switch will forward the frame to all ports except the port on which it was received.
Why will a switch never learn a broadcast address()。 A.Broadcasts only use network layer addressing.B.A broadcast frame is never forwarded by a switch.C.A broadcast address will never be the source address of a frame.D.Broadcast addresses use an incorrect format for the switching table.E.Broadcast frames are never sent to switches.
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（请作答此空） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.propagationB.transmissionC.collidingD.listening
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （请作答此空） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（ ） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.convenient B.inconvenientC.usableD.unusable
CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（请作答此空）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（ ） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.transmissionB.collisions C.transportationD.reception
框架页的基本语法是（）A、frames ... /frames B、frame ... /frame C、frameset ... /framesetD、framed ... /framed
What are two advantages of Layer 2 Ethernet switches over hubs?（）A、decreasing the number of collision domainsB、filtering frames based on MAC addressesC、allowing simultaneous frame transmissionsD、increasing the size of broadcast domainsE、increasing the maximum length of UTP cabling between devices
What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table?（）A、The switch will not forward unicast frames.B、The switch will forward the frame to a specific port.C、The switch will return a copy of the frame out the source port.D、The switch will remove the destination MAC from the switch table.E、The switch will forward the frame to all ports except the port on which it was received.
Which two of these are characteristics of the 802.1Q protocol?（）A、it is a layer 2 messaging protocol which maintains vlan configurations across network.B、it includes an 8-bit field which specifies the priority of a frame.C、it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.D、it modifies the 802.3 frame header,and thus requires that the FCS be recomputed.E、it is a trunking protocol capable of carring untagged frames.
How many expansion frames can be attached to an IBM TS3500 model L23 or L53 base frame? （）A、15B、16C、17D、18
单选题At the top of the A-frames there is a strong cast iron frame called （）.Acylinder linerBcylinder coverCthe gear boxDthe scavenging box
单选题What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table?（）AThe switch will not forward unicast frames.BThe switch will forward the frame to a specific port.CThe switch will return a copy of the frame out the source port.DThe switch will remove the destination MAC from the switch table.EThe switch will forward the frame to all ports except the port on which it was received.
单选题Why will a switch never learn a broadcast address?（）ABroadcasts only use network layer addressing.BA broadcast frame is never forwarded by a switch.CA broadcast address will never be the source address of a frame.DBroadcast addresses use an incorrect format for the switching table.EBroadcast frames are never sent to switches.
单选题（） of the A-frames there is a strong cast iron frame called the scavenging air box.AAt the topBAt the bottomCIn the topDIn the bottom
多选题What are two advantages of Layer 2 Ethernet switches over hubs？（）Adecreasing the number of collision domainsBfiltering frames based on MAC addressesCallowing simultaneous frame transmissionsDincreasing the size of broadcast domainsEincreasing the maximum length of UTP cabling between devices
单选题（）标记可以在用户浏览器不支持多窗口结构显示时，告知用户一些有关信息。A＜FRAME＞＜/FRAME＞B＜FRAMES＞＜/FRAMES＞C＜NOFRAME＞＜/NOFRAME＞D＜NOFRAMES＞＜/NOFRAMES＞
多选题Which two of these are characteristics of the 802.1Q protocol？（）Ait is a layer 2 messaging protocol which maintains vlan configurations across network.Bit includes an 8-bit field which specifies the priority of a frame.Cit is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.Dit modifies the 802.3 frame header，and thus requires that the FCS be recomputed.Eit is a trunking protocol capable of carring untagged frames.
单选题Fireworks中Frame的Show All Frames的含义是：（）A关闭洋葱皮功能，仅显示当前影格B显示当前影格下面的一个影格C显示当前影格前后的影格D显示所有影格