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Wireless Networks

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María Burgos

on 12 March 2013

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Transcript of Wireless Networks

María Burgos Martín - Hervás WIRELESS NETWORKS Definition Types Infrared data
transmission Bluetooth Wireless
Fidelity Cellular networks It's implemented and administered using radio communication. A wireless network it's any type of computer network that is not connected by cables of any kind. It is a method to avoid the costly process of introducing cables into a building. It's very useful to connect various equipment locations. WAN MAN LAN PAN Personal Area
Networks Local Area
Networks Metropolitan Area
Networks Wide Area
Networks IR data transmission is employed in short-range communication among computer peripherals and personal digital assistants. It responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light. They are useful for indoor use in areas of high population density. It doesn't penetrate walls and does not interfere with other devices in adjoining rooms. Infrared is the most common way for remote controls to command appliances. Bluetooth is a wireless technology standard for exchanging data over short distances from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Bluetooth provides a secure way to connect and exchange information between devices such as faxes, mobile phones, telephones, laptops, personal computers, printers, GPS receivers, digital cameras, and video game consoles. Wi-Fi is a popular technology that allows an electronic device to exchange data using radio waves over a computer network, including high-speed Internet connections. Wi-Fi can be less secure than wired connections (such as Ethernet) because an intruder does not need a physical connection. What's Wireless Fidelity? Is it secure? Because of this, Wi-Fi has adopted various encryption technologies such as... WEP (proved easy to break) WPA &
WPA2 (higher quality protocols) WPS (optional feature that had a serious flaw that allowed an attacker to recover the router's password) PROS CONS Aroa García Muñoz Wi-Fi allows cheaper deployment of local area networks (LANs).

It also allow that places where cables cannot be run, such as outdoor areas and historical buildings, can host wireless LANs. Manufacturers are building wireless network adapters into most laptops.

It makes Wi-Fi an economical networking option, actually included in most devices. Different competitive brands of access points and client network-interfaces can inter-operate.

Products designated as "Wi-Fi Certified" by the Wi-Fi Alliance are backwards compatible. Unlike mobile phones, any standard Wi-Fi device will work anywhere in the world. WPA2 is considered secure, providing a strong passphrase.

New protocols for quality-of-service make Wi-Fi more suitable for applications such as voice and video.

Power saving mechanisms extend battery life. Spectrum assignments and operational limitations are not consistent worldwide (most of Europe allows for an additional two channels beyond those permitted in the US for the 2.4 GHz band, while Japan has one more on top of that)

Europe is essentially homogeneous in this respect. The current 'fastest' norm uses double the radio spectrum/bandwidth (40 MHz).

This means there can be only one 802.11n network on the 2.4 GHz band at a given location, without interference to/from other WLAN traffic. Even with the strong passphrase we've talk about, it's much more easy to break into a Wi-Fi network than to break into a optical fiber network, for example. Definition A cellular network is a radio network distributed over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base station.

In a cellular network, each cell uses a different set of frequencies from neighboring cells, to avoid interference and provide guaranteed bandwidth within each cell. Advantages of mobile networks Flexible enough to use the features and functions of almost all public and private networks. Increased capacity. Reduced power use. Larger coverage area. Reduced interference from other signals. 1G 1980's telecommunications ANALOG 2G 1990's! DIGITAL networks 3G 2000 INTERNET access 4G 2010 ULTRA-BROADBAND
Internet access IP telephony High definition
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