Chapter 5 802.11 PHYs and Network Types Flashcards
the 802.11 standard specified operations of wireless devices
Layer 1 and Layer 2
the OSI model includes seven layers from top to bottom:
Application, Presentation, Session, Transport, Network, Data, Physical
The ERP and OFDM phys both support maximum data rates of blank Mbps, but the ERP phy operates at 24 GHz, and the OFDM phy operates at 5 GHz.
54 mbs
HT is the only phy that operates in both
2.4 GHz and 5 GHz
VHT is a
5 GHz only PHY
HT introduced blank and VHT introduced blank
MIMO and MU-MIMO
HT supports a maximum of Blank spatial streams and VHT supports a maximum of Blank spatial streams.
4 spatial streams and 8 spatial streams.
All PHYs use 20 MHz channels or some factor thereof, except for the DSSS and HR/DSSS PHYs, which use 22 MHz channels.
All PHYs use 20 MHz and if it’s on DSS and HR/DSSS PHY it would be 22 MHz
HT supports up to 40 mhz channel widths and VHT supports up to 160 mhz channel widths.
40 mhz at HT and 160 mhz at VHT
Area in which clients can connect to and pass frames through the bss.
BSA (Basic Service Set)
An infrastructure bss (or simply BSS) uses an blank, and an independent bs (IBSS) does not.
AP
An Blank is one or more BSs sharing a distribution system medium (such as an Ethernet network).
ESS (Extended Service Set)
The SSID is the name of the BS; the BSID is the underlying identifier that differentiates one BS from another when they use the same SSID.
SSID (Service Set Identifier)
when using wireless bridges, the blank the link, the more important the alignment.
Longer
In a wireless bridging configuration, Blank bridge will act as the root bridge, and the other(s) will act as non-root bridges.
One
