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Ad-hoc is simply client-to-client; while infrastructure uses a Wireless Access Point (WAP).
Base
What is the difference between BSSID and ESSID?
BSSID (Basic Service Set Identifier) uses one WAP. ESSID (Extended SSID) uses several WAPs connected to one switch, all using the same SSID.
Extendability
What ISM (Industrial Scientific and Medical) bands are specified by 802.11 (WiFi)?
2.4GHz & 5 GHz.
Two bands
What Wi-Fi channels are used in North America, Europe, and Japan?
US: 1, 6 or 7, 11
Europe: 1 - 13
Japan: 1 - 14
What does the 802.11b standard define?
11Mbps on the 2.4GHz band
What does the 802.11a standard define?
54Mbps on the 5GHz band
Fast
What does the 802.11g standard define?
54Mbps on the 2.4GHz band, backwards compatible with b
What does the 802.11n standard define?
74Mbps - 600Mbps on both bands. (Throughput depends on number of antennae.) Requires at least three antennae. Uses MIMO (Multiple In/ Multiple Out). Backward compatible with all previous standards.
What is Greenfield mode?
A setting on an n WAP defining that there are no non-n clients. Allows WAP to broadcast only n signal to allow higher throughput.
What does the 802.11ac standard define?
>1Gbps on both bands. Technically two WAPs (2.4Ghz and 5Ghz), full backward compatibility. Uses MUMIMO (Multi-user MIMO).
Fastest
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