The bridge is three hundred ________ long.A.feetB.footsC.footesD.feets

A.Switch3

B.Switch4

C.Switch2

D.Switch1

A.All ports will be in a state of discarding, learning, or forwarding.

B.Thirty VLANs have been configured on this switch.

C.The bridge priority is lower than the default value for spanning tree.

D.All interfaces that are shown are on shared media.

E.All designated ports are in a forwarding state.

F.The switch must be the root bridge for all VLANs on this switch.

A．Reflecting on topics that appeal to the author and readers

B．Introducing new evidence to what has been confirmed before

C．Identifying the kinds of questions supported by the experiments

D．Claiming that speakers of different languages differ dramatically

A. the switch with the lowest MAC address

B. the switch with the higest MAC address

C. the switch witch the higest IP address

D. the switch with the lowest IP address

g.This feature allows you to define a virtual server that represents a cluster of real servers, known as a server farm.When a client initiates a connection to the virtual server, the IOS SLB load balances the connection to a chosen real server, depending on the configured load balance algorithm or predictor.Which three implementation modes may be used to deploy SLB？ （）

A. Router mode

B. One-arm mode

C. Three-arm mode

D. Bridge mode inline

A.ebacd

B.debca

C.baecd

D.dbeca

A.Microsegmentation decreases the number of collisions on the network.

B.if a switch receives a frame for an unkown destination,it uses ARP to resolve the address.

C.Spanning Tree Protocol allows switches to automatically share vlan information.

D.In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port.

E.Establishing vlans increases the number of broadcast domains.

F.Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.

last summer when an ant scientist was a guest at our cottage.I boasted to my naturalist friend that I could store food in an open container for a whole week and keep it safely out of the reach of house ants.Sunday night the experiment got under way.I put a large wooden tub on the kitchen floor of our cottage.After filling it to about the three-quarters mark with water, I placed a high wooden stand in the middle of it.On top of the stool, I put a saucer containing the bait: three or four pieces of rich chocolate candy.Then I painted a wide band of very slow-drying glue around the outside of the wooden tub.With that, I stood back and admired my ant trap, fully confident that the bait would be untouched upon my return to the cottage the following weekend.When my naturalist friend and I entered the cottage just six days later, ants were swarming over the bait! Here's how they put me to shame.Single files of ants had marched head-on into the band of glue around the outside of the wooden tub.A handful of them had endured martyrdom, for they had embedded themselves end to end, and made causeways of their bodies.The tempting bait on top of the stool must have caused the little creatures to use their brains to the limit.Ants hate water, but they had been courageous enough to build a highway across the stretch of water to a leg of the stool.They had assembled tiny pieces of grass and bits of wood no longer than a thirty-second of an inch, and had glued them together with saliva until their bridge extended from shore to island.Once they reached the leg of the wooden stool, traffic was almost all one way toward the chocolate bait.But there were some show-off fellows around, too; they were doing things which ants have been known to do very rarely.We noticed that a half dozen or so were walking across the ceiling, and when they came directly over the bait they let themselves fall squarely into the middle of their merry brothers.It is little wonder that I have been on the trail of ants ever since, trying to trip them up or at least learn some of the special tactics that they use.

1.The writer wanted to convince his friend that().

A.he knew more about ants than the scientist

B.he could keep ants away from food

C.ants are more intelligent than human beings

D.he could make experiments with ants

2.The experiment was carried out in().

A.the laboratory

B.an unused shed

C.the kitchen

D.the living-room

3.When the writer and his friend entered the cottage six days later, they found().

A.a lot of ants eating the chocolate candy

B.dead ants everywhere

C.swarms of ants marching around the tub

D.swarms of ants walking across the ceiling

4.The bait was().

A.in the middle of the water

B.kept on the water

C.at the top of the tub

D.on a stool in the tub

5.The ants managed to get over glue by().

A.marching courageously across it

B.going round it in single files

C.covering it with their bodies

D.making a bridge with grass and wood

The George Washington Bridge is a double-deck bridge across _____ Hudson River .

A.a

B.an

C.the

D./

There () a bridge across the river.

A、stands

B、standing