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VLAN（Virtual Local Area Network)即虚拟局域网，是一种在物理局域网上构建多个逻辑局域网的技术。（）
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更多“VLAN(Virtual Local Area Networ…”相关的问题
Then there's cyberbusiness, We're promised 30 catalog shopping - just point and click for great deals. We'll order airline tickets 31 the network, book restaurants and negotiate sales 32 Stores will become obsolete. So how come my local mall does more 33 in an afternoon than the entire Internet 34 in a month？ Even if there were a trustworthy way to 35 money over the Internet, the network is 36 a most essential ingredient of trade and commerce : salespeople.
What's absent from this electronic wonderland？ People contact. Computers and networks 37 us from one another. A network chat line is a limp 38 for meeting friends over coffee.No interactive multimedia display comes 39 to the excitement of a 40 concert. This virtual reality where frustration is legion and - in the holy names of Education and Progress - important aspects of human interactions are relentlessly devalued.
第 21 题
Computers are now being pushed into schools. We know that multimedia will make 【21】______ easy and fun. Children will happily learn from 【22】______ characters while taught by expertly 【23】______ software. Who needs teachers when you've got 【24】______ education？ These expensive toys are difficult to use in the classrooms and 【25】______ extensive teacher training. Sure, kids love video games 【26】______ think of your own experience: can you 【27】______ even one educational filmstrip of many years ago？ I'll 【28】______ you remember the two or three great teachers who made a 【29】______ in your life.
Then there's cyberbusiness. We're promised 【30】______ catalog shopping -- just point and click for great deals. We'll order airline tickets 【31】______ the network, book restaurants and negotiate sales 【32】______ . Stores will become obsolete. So how come my local mall does more 【33】______ in an afternoon than the entire Internet 【34】______ in a month？ Even if there were a trustworthy way to 【35】______ money over the Internet, the network is 【36】______ a most essential ingredient of trade and commerce: salespeople.
What's absent from this electronic wonderland？ People contact. Computers and networks 【37】______ us from one another. A network chat line is a limp 【38】______ for meeting friends over coffee. No interactive multimedia display comes 【39】______ to the excitement of a 【40】______ concert. This virtual reality where frustration is legion and -- in the holy names of Education and Progress -- important aspects of human interactions are relentlessly devalued.
【21】
A．schoolwork
B．exercise
C．teamwork
D．research
Computers are now being pushed into schools. We know that multimedia will make 【21】______ easy and fun. Children will happily learn from 【22】______ characters while taught by expertly 【23】______ software.Who needs teachers when you've got 【24】______ education？ These expensive toys are difficult to use in the classrooms and 【25】______ extensive teacher training. Sure, kids love video games — 【26】______ think of your own experience: can you 【27】______ even one educational filmstrip of many years ago？ I'll 【28】______ you remember the two or three great teachers who made a 【29】______ in your life.
Then there's cyberbusiness. We're promised 【30】______ catalog shopping—just point and click for great deals. We'll order airline tickets 【31】______ the network, book restaurants and egotiate sales 【32】______ .Stores will become obsolete. So how come my local mall does more 【33】______ in an afternoon than the entire Internet 【34】______ in a month？ Even if there were a trustworthy way to 【35】______ money over the Internet, the network is 【36】______ a most essential ingredient of trade and commerce: salespeople.
What's absent from this electronic wonderland？ People contact. Computers and networks 【37】______ us from one another. A network chat line is a limp 【38】______ for meeting friends over coffee. No interactive multimedia display comes 【39】______ to the excitement of a 【40】______ concert. This virtual reality where frustration is legion and where—in the holy names of Education and Progress—important aspects of human interactions are relentlessly devalued.
【21】
A．schoolwork
B．exercise
C．teamwork
D．research
But, while gizmos make a global network possible, it takes human cooperation to make it happen. Standage's insight in this regard adds depth to his technological history, he under scores the relevance to our own time of the struggles of Samuel Morse in America, William Cooke in England, and other telegraph pioneers. They made the technology work efficiently, sold it to a skeptical public, and overcame national and international bureaucratic obstacles. The solutions they found smooth the Internets way today.
Consider a couple of technical parallels. Telegrams were sent from one station to the next, where they were received and retransmitted until they reached their destination. Stations along the way were owned by different entities, including national governments. Internet data is sent from one server computer to another that receives and retransmits it until it reaches its destination. Again the computers have a variety of owners.
Then there is the social impact. The Internet is changing the way we do business and communicate. It makes possible virtual communities for individuals scattered around the planet who share mutual interests. Yet important as this may turn out to be, it is affecting a world that was already well connected by radio, television, and other telecommunications. The Associated Press, Reuters, and other news services would have spread the Stare report quickly without the Internet. In this respect, the global telegraph network was truly revolutionary. The unprecedented availability of global news in real time gave birth to the Associated Press and Reuters news services. It gave a global perspective to newspapers that had focused on local affairs. A provincialism that geographical isolation had forced on people for millennia was gone forever. Some seers naively hailed this as a force for world peace. They predicted that tensions over cultural and ethnic differences would relax as people interacted in real time. Visionaries say the same about the Internet. While communications can smooth this process, they don't automatically make it happen. As the experience of the past century and a half has shown, peace takes the will to make it work and sustained effort by all parties.
What does "the gem of late 20th century technology” refer to？
A．The telegraph.
B．Information theory.
C．Materials technology.
D．The Internet.
A.virtual class B{}; virtual class A : public B {};
B.virtual class B{}; class A : virtual public B {};
C.class B{}; class A : virtual public B {};
D.virtual class B{}; class A : public B {};
A.Very reliable forwarding
B.Virtual routing forwarding instances
C.Vip redundancy features
D.Virtual routing format
A.Virtual Machine Manangement
B.Virtual Machine Maintenance
C.Virtual Machine Monitor
D.Virtual Machine Mechanism
