cnp3-ebook/protocols/wifi — English @ Weblate

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19 ../../protocols/wifi.rst:23 • ../../protocols/wifi.rst:25

	English 54 Mbps 7/10000 · 7
20 ../../protocols/wifi.rst:23

	English 35/120 6/10000 · 6
21 ../../protocols/wifi.rst:24

	English 802.11b 7/10000 · 7
22 ../../protocols/wifi.rst:24

	English 4.3 Mbps 8/10000 · 8
23 ../../protocols/wifi.rst:24

	English 11 Mbps 7/10000 · 7
24 ../../protocols/wifi.rst:24 • ../../protocols/wifi.rst:25

	English 38/140 6/10000 · 6
25 ../../protocols/wifi.rst:25

	English 802.11g 7/10000 · 7
26 ../../protocols/wifi.rst:25

	English 19 Mbps 7/10000 · 7
27 ../../protocols/wifi.rst:26

	English 802.11n 7/10000 · 7
28 ../../protocols/wifi.rst:26

	English 2.4/5 GHz 9/10000 · 9
29 ../../protocols/wifi.rst:26

	English 74 Mbps 7/10000 · 7
30 ../../protocols/wifi.rst:26

	English 150 Mbps 8/10000 · 8
31 ../../protocols/wifi.rst:26

	English 70/250 6/10000 · 6
32 ../../protocols/wifi.rst:29

	English When developing its family of standards, the `IEEE 802.11 working group <http://www.ieee802.org/11/>`_ took a similar approach as the `IEEE 802.3 working group <http://www.ieee802.org/3/>`_ that developed various types of physical layers for Ethernet networks. 802.11 networks use the CSMA/CA Medium Access Control technique described earlier and they all assume the same architecture and use the same frame format. 415/10000 · 415
33 ../../protocols/wifi.rst:35

	English The architecture of WiFi networks is slightly different from the Local Area Networks that we have discussed until now. There are, in practice, two main types of WiFi networks : `independent` or `adhoc` networks and `infrastructure` networks [#fBSS]_. An `independent` or `adhoc` network is composed of a set of devices that communicate with each other. These devices play the same role and the `adhoc` network is usually not connected to the global Internet. `Adhoc` networks are used when for example a few laptops need to exchange information or to connect a computer with a WiFi printer. 591/10000 · 591
34 ../../protocols/wifi.rst:42

	English An 802.11 independent or adhoc network 38/10000 · 38
35 ../../protocols/wifi.rst:47

	English Most WiFi networks are `infrastructure` networks. An `infrastructure` network contains one or more `access points` that are attached to a fixed Local Area Network (usually an Ethernet network) that is connected to other networks such as the Internet. The figure below shows such a network with two access points and four WiFi devices. Each WiFi device is associated to one access point and uses this access point as a relay to exchange frames with the devices that are associated to another access point or reachable through the LAN. 533/10000 · 533
36 ../../protocols/wifi.rst:54

	English An 802.11 infrastructure network 32/10000 · 32
37 ../../protocols/wifi.rst:56

	English An 802.11 access point is a relay that operates in the datalink layer like switches. The figure below represents the layers of the reference model that are involved when a WiFi host communicates with a host attached to an Ethernet network through an access point. 263/10000 · 263
38 ../../protocols/wifi.rst:93

	English 802.11 devices exchange variable length frames, which have a slightly different structure than the simple frame format used in Ethernet LANs. We review the key parts of the 802.11 frames. Additional details may be found in [IEEE802.11]_ and [Gast2002]_ . An 802.11 frame contains a fixed length header, a variable length payload that may contain up 2324 bytes of user data and a 32 bits CRC. Although the payload can contain up to 2324 bytes, most 802.11 deployments use a maximum payload size of 1500 bytes as they are used in `infrastructure` networks attached to Ethernet LANs. An 802.11 data frame is shown below. 617/10000 · 617

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