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WLAN（Wireless LAN)是计算机网络与无线通信技术相结合的产物。下列哪些属于WLAN 技术标准？（)A
WLAN(Wireless LAN)是计算机网络与无线通信技术相结合的产物。下列哪些属于WLAN 技术标准？()
A 802.11a
B 802.11b
C 802.11g
D 802.11q
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
WLAN(Wireless LAN)是计算机网络与无线通信技术相结合的产物。下列哪些属于WLAN 技术标准？()
A 802.11a
B 802.11b
C 802.11g
D 802.11q
如果结果不匹配，请 联系老师 获取答案
更多“WLAN（Wireless LAN)是计算机网络与无线通信技…”相关的问题
A．whenever
B．whoever
C．whatever
D．wherever
Digital's wireless LAN products are clear leaders in the marketplace. Digital【B11】the industry's most complete portfolio(系列服务) of mobile and wireless products.【B12】such as wireless PC Cards, wireless ISA adapters and superior wireless bridge, digital cordless telephony【B13】desktop devices to communicate wirelessly with other wireless【B14】, or access network files, services, and devices on the wired network.
Wireless communication technology can also be used for【B15】time data collection in locations【B16】considered too remote, inaccessible or environmentally hostile for conventional wired monitoring systems. Mobile hosts such as notebook and palmtop computers are now widely【B17】and affordable. Today's laptops and notebooks come loaded【B18】almost all imaginable wireless communications devices. This gives desktop PC customers a choice of wireless technology【B19】best suits their mobility and application needs.
Other markets for wireless technology include customer service, retailing, and health care.【B20】every market in the service sector of the economy is a candidate for wireless technologies and services.
【B1】
A．reduces
B．improves
C．disturbs
D．provokes
A.目前接入手段主要基于xDSL/CableModem/高速以太网技术(LAN)/无线宽带数据接入(WLAN)等
B.面向宽带网络应用的新型接入网关
C.不是宽带用户接入的核心设备
D.网络承载功能和控制实现功能
Yet any number of pitfalls lie ahead for the worldwide data network. Current networking technology has allowed only limited mobile access up until now. A small Finnish firm, however, is promoting a solution to connect portable devices—cell phones, personal digital assistants (PDAs), or laptops—reliably and securely to the Internet.
"Access to the World Wide Web will eventually be as foolproof as telephoning is now," says Panu Pietikaeinen, chief executive officer of Firma NetSeal Technologies of Espoo, Finland.
While the Global System for Mobile Communications (GSM) radio network spans the globe, only small bits of data can be transmitted over it. Wireless Local Area Networks (WLANs) can handle broadband traffic, but only within their local transmitting area. That's mainly why new wireless transmission techniques such as Bluetooth can send data without at cables, but only up to a distance of about ten meters.
Until now, any user who wanted to move between coverage areas would tediously have to close the old connection manually and then dial in again to the new network. RoamMate software will automate the process by establishing a mobile, secure Internet connection without the user having to give any thought to infrastructure concerns such as cover age areas.
"This kind of software, if it really works, would certainly be in line with our business goals," says Carsten Meincke of AOL, the world's largest online service provider.
Meincke sees the latest technological developments as headed toward uninterrupted Internet access anyway, whether it's from a car, a cellphone, or other portable devices. "We need to free ourselves from the idea that only one kind of device can get us online."
"There's certainly been no intelligent software of this type until now," says Andreas Guggenbichler of 3Com, the U.S.-based networking firm. "If I really didn't have to think anymore about which channel is best suited at any given moment to build a connection-whether to a local network or the Internet-it would make portable devices much easier to use," Guggenbichler, himself an expert in networking and Internet telephony, argues.
For the first time, RoamMate allows every user to get on the Internet in the same way they use their cell phone," says Pietikaeinen. A mobile Internet connection would resemble a cell phone connection.
Cell phone users don't worry about which phone company is providing network access when they're on the road; telephone companies have struck agreements to assure their customers interruption-free service. The phone automatically looks for the right provider as the user changes coverage zones, without interrupting the call.
Down the road, all mobile devices will work in the same way. RoamMate supports all current transmission technolo gies, such as ISDN, GSM, Bluetooth, local networks (LAN, Local Area Network), WLAN, modem, and even the antici pated mobile radio standard GPRS.
An Internet IP address, not a phone number, would then become the user's permanent identification code. The software, installed in the mobile units as well as in the servers of participating companies and Internet service providers, would take care of managing the addresses.
The new invention is already in place at Avecra the firm which runs the dining cars for the Finnish railways. RoamMate enables communication with or without a cable connection, so that the company's workers can get onto the company's priyate intranet during the trip.
After four years of development time, Pietikaeinen and his associate Juhani Talvela are now seeking out cooperative partners around the world to help put to work their (self-proclaimed) trailblazing software.
A．a new method to access to the Internet is on the way
B．a new technology to connect with Internet has been created and seeking the cooperation to enter the market
C．disadvantages of old ways to access to the Internet
D．new tendencies in the fields of mobile communications
