搜题请搜索小程序“爱下问搜题”
问题 单项选择题

虚拟局域网通常采用交换机端口号、MAC地址、网络层地址或

A．物理网段定义

B．操作系统定义

C．广播组地址定义

D．网桥定义

答案

参考答案：C

解析： 虚拟局域网技术基于交换技术，而交换技术涉及到网络的多个层次，所以虚拟局域网也可以在网络的不同层次上实现，主要表现在对虚拟局域网成员的定义方法上，通常有以下4种： 1)用交换机端口号定义虚拟局域网； 2)用MAC地址定义虚拟局域网； 3)用网络层地址定义虚拟局域网； 4)IP广播组虚拟局域网。

单项选择题

Questions from 31 to 35 are based on the following passage: There are a lot of “markets”. Some markets are local; you may be willing to compare prices for fruits and vegetables in a few shops in your local area, but you would be unwilling to go across the city to find out more information. Some markets are national. Many firms sell goods across the country. Some markets are global or international. Increasingly, more and more countries are involved in the world economy, whether they know about it or not.However, there are many other markets: labor markets for job seekers, supermarkets for grocery shopping, foreign exchange market, capital market, real estate markets and so on. And we must not overlook the fact that many services such as banking, insurance are also bought and sold on a worldwide scale. But what is a “market” Most people would say, “A market is a place where enough buyers and sellers meet face to face, so that a market price for goods and services can be determined.” However, with rapid growth of telecommunications, it is no longer necessary for buyers and sellers to physically meet to form a market.You may hear the terms “global market” or “global economy”. What do those terms mean to you What do they mean to business today Thanks to the Information Age we are seconds away from the rest of world. Business everywhere recognizes that they can expand their market to anywhere and do business at any time because of the Internet. Now, the Internet is the fastest growing market in the world today, yet buyers and sellers don’t even have to leave their own homes to transact business.In the modern world, a market can take many forms. Generally speaking, a market may be housed in a place, or it may exist only in people’s minds. And a market can be any place or process that brings together buyers and sellers with a view to agreeing to a price.

Which of following markets is not mentioned in the passage （）

A．Asian market　

B．international market

C．national market

D．local market
查看答案
填空题

人体通过各种简单或复杂的反射，来调节自身的________，从而能够对体内外的________迅速做出适当的反应。
查看答案