Apple AirPort Networks Anleitung zur Fehlerbehebung PDF herunterladen (Seite 18)

Wi-Fi menu in the menu bar and the Wi-Fi view in the Network

system preference pane.)

When a device’s wireless adapter connects—technically, associates—

with a base station, the

device can send data to and receive data from

the base station. If the base station has encryption enabled, then the

device must provide an encryption key before the base station allows

the device access to any networks to which it connects. The key, which

consists of a series of characters, needs to be provided exactly as it was

entered on the base station, whether typed or tapped in or sent from

a keychain in the operating system.

Once an adapter connects to a base station and the encryption key

is accepted, the device’s operating system can carry out the

next steps,

such as automatically requesting an Internet protocol (IP) address

using DHCP and sending data over the wireless network.

With newer adapters, a connection may be made directly to another

device with peer-to-peer networking regardless of whether the

adapter

is connected to a regular Wi-Fi network. An example is AirDrop, an

Apple-only version of a more general standard called Wi-Fi Direct (see

Share Files with AirDrop).

Wi-Fi Spectrum

Wi-Fi networks use unlicensed spectrum, so called because regulatory

agencies allow license-free use of those airwaves by everyone in a given

country. In contrast, cellular telephone companies pay huge amounts

for the exclusive geographic rights to certain frequencies.

Note: In some developing nations, inexpensive or free licenses are

required for outdoor use but not indoor use, or by businesses but not

individuals. In the United States, Australia, Japan, South Korea, and

most of Europe, no licenses are required.

Spectrum bands—specified ranges of frequencies—are divided into

smaller portions called channels, which allow many devices to use

Click here to buy the full 196-page “Take Control of Your Apple Wi-Fi Network” for only $20!

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Apple AirPort Networks Anleitung zur Fehlerbehebung Seite 18