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Which of the following usually causes a tree to grow unhealthy?
A. Giving a tree a special shape and a definite height.
B. Removing small side branches and making a tree look less thick.
C. Allowing too many branches to grow in the middle.
D. Having a tree surrounded by many other trees.
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更多 “ Which of the following usually causes a tree to grow unhealthy?A. Giving a tree a special shape and a definite height.B. Removing small side branches and making a tree look less thick.C. Allowing too many branches to grow in the middle.D. Having a tree surrounded by many other trees. ” 相关考题
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In the following statements about graph operations，which one is NOT correct?A．Finding critical path is an operation on directed graphB．Finding critical path is an operation on undirected graphC．Spanning tree of a graph may not be uniqueD．Minimum spanning tree of a graph may not be unique
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A. MeshB. Token ringC. StarD. Spanning tree
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A. ARP spoofingB. VLANC. MirroringD. Spanning tree
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Which of the following are spanning tree port states?()
A. LearningB. SpanningC. ListeningD. ForwardingE. InitializingF. FilteringG. Permitting
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Which of the following are shared distribution tree characteristics()
A.Memory requirements are higher for shared distribution tree than for source distributiontree.B.Creates a tree from a central RP to all last-hoprouters.C.Uses a rendezvous point.D.An optimal path is created between each source router and each last-hoprouter.E.Place（S，G）entry in each router’smulticast routing table.F.Place（*，G）entry in a router’smulticast routing to table.
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Which command enhances the 802.1D convergence time on ports that are connected to hosts?()
A. spanning-tree backbonefastB. spanning-tree uplinkfastC. spanning-tree portfastD. spanning-tree cost512
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Which command enables RSTP on a switch?()
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Passage ThreeTrees should only be pruned (修剪) when there is a good reason for doing so. Many gardeners believe that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape. The object may be to get a tree of the right height, and to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus causing wounds. A tree may grow healthier by removing the branches that are locking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry (进入) for diseases, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die. Pruning is usually clone in winter, for then you can see the shape of the tree clearly without the interference from the leaves.41. According to the article, which of the following statement is NOT true?A. Pruning is necessary when there are unwanted branches.B. Damage is done to a tree if it is left to grow in its own way.C. Diseased or dead branches should be cut away if they are found to rub against each other.D. Growing side branches often prevent air from moving freely.
考题
Trees should only be pruned when there is a good and clear reason for doing so and,
fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.
One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially for
this purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.
Pruning should be done to__________.A.make the tree grow taller
B.improve the shape of the tree
C.get rid of the small branches
D.make the small branches thicker
考题
Trees should only be pruned when there is a good and clear reason for doing so and,
fortunately, the number of such reasons is small. Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have a desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the centre and so preventing the free movement of air.
One result of pruning is that an open wound is left on the tree and this provides an easy entry for disease, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die, so that there is a period when the tree is at risk. It should be the aim of every gardener to reduce which has been pruned smooth and clean, for healing will be slowed down by roughness. You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops produced especially for
this purpose. Pruning is usually without interference from the leaves and also it is very unlikely that the cuts you make will bleed. If this does happen, it is, of course, impossible to paint them properly.
Trees become unhealthy if the gardener__________.A.allows too many branches to grow in the middle
B.does not protect them from wind
C.forces them to grow too quickly
D.damages some of the small side branches
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Which of the following are spanning tree port states?（）A、LearningB、SpanningC、ListeningD、ForwardingE、InitializingF、FilteringG、Permitting
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Which of the following troubleshooting targets is considered to be a Layer 2 issue？（Choose allthat apply.）（）A、Spanning Tree ProtocolB、CablingC、Frame forwardingD、Packet forwardingE、EtherChannelF、Routing protocols
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For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（）A、root portB、backup portC、designated portD、alternate port
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Which command enables RSTP on a switch?（）A、spanning-tree mode rapid-pvstB、spanning-tree uplinkfastC、spanning-tree backbonefastD、spanning-tree mode mst
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Which of the following are shared distribution tree characteristics？ （Choose all that apply.）（）A、Memory requirements are higher for shared distribution tree than for source distribution treeB、Creates a tree from a central RP to all last-hop routersC、Uses a rendezvous pointD、An optimal path is created between each source router and each last-hop routerE、Place （S，G） entry in each router’s multicast routing tableF、Place （*，G） entry in a router’s multicast routing to table
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Which command enhances the 802.1D convergence time on ports that are connected to hosts?（）A、spanning-tree backbonefastB、spanning-tree uplinkfastC、spanning-tree portfastD、spanning-tree cost512
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In which of the following topologies could the failure of one machine cause the entire network tostop functioning?（）A、MeshB、Token ringC、StarD、Spanning tree
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Which of the following features should an administrator configure to allow an IDS to watch thetraffic on a switch?（）A、ARP spoofingB、VLANC、MirroringD、Spanning tree
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多选题Which of the following three port types are valid Spanning Tree port types？（Choose the best threeanswers.）（）ADesignated portBNonswitch portCSwitch portDNonroot portENondesignated portFRoot port
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单选题Which spanning-tree command would cause a PortFast-enabled interface to lose its PortFast-operational status and disable BPDU filtering if it receives BPDUs？（）A
spanning-tree guard rootB
spanning-tree portfast bpduguard defaultC
spanning-tree bpduguard enableD
spanning-tree bpdufilter enableE
spanning-tree portfast bpdufilter default
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单选题Which of the following commands can be issued without interfering with the operation of loop guard？（）A
Switch（config-if）#spanning-tree guard rootB
Switch（config-if）#spanning-tree portfastC
Switch（config-if）#switchport mode trunkD
Switch（config-if）#switchport mode access
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单选题Which command enables RSTP on a switch?（）A
spanning-tree mode rapid-pvstB
spanning-tree uplinkfastC
spanning-tree backbonefastD
spanning-tree mode mst
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多选题Which of the following troubleshooting targets is considered to be a Layer 2 issue？（Choose allthat apply.）（）ASpanning Tree ProtocolBCablingCFrame forwardingDPacket forwardingEEtherChannelFRouting protocols
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多选题Which tree of these are types of Ethernet Virtue Connections （EVCs） in the MEF concept？（）Amultipart-to-multipoint EVC （E-LAN）Bhub spoke EVC （E-Tree）Cpoint to point EVC （E-Line）Drooted multipoint EVC （E-Tree）Epoint-to-multipoint EVC （E-Tree）
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多选题Which of the following are spanning tree port states?（）ALearningBSpanningCListeningDForwardingEInitializingFFilteringGPermitting
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