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Test Your Knowledge in Computers #542
Difficulty: Medium
A globally scoped variable is invalid throughout the entire program.
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struct_bss_parameters(9) [centos man page]

BSS_PARAMETER(9) Actions and configuration STRUCT BSS_PARAMETER(9) NAME
struct_bss_parameters - BSS parameters SYNOPSIS
struct bss_parameters { int use_cts_prot; int use_short_preamble; int use_short_slot_time; u8 * basic_rates; u8 basic_rates_len; int ap_isolate; int ht_opmode; s8 p2p_ctwindow; s8 p2p_opp_ps; }; MEMBERS
use_cts_prot Whether to use CTS protection (0 = no, 1 = yes, -1 = do not change) use_short_preamble Whether the use of short preambles is allowed (0 = no, 1 = yes, -1 = do not change) use_short_slot_time Whether the use of short slot time is allowed (0 = no, 1 = yes, -1 = do not change) basic_rates basic rates in IEEE 802.11 format (or NULL for no change) basic_rates_len number of basic rates ap_isolate do not forward packets between connected stations ht_opmode HT Operation mode (u16 = opmode, -1 = do not change) p2p_ctwindow P2P CT Window (-1 = no change) p2p_opp_ps P2P opportunistic PS (-1 = no change) DESCRIPTION
Used to change BSS parameters (mainly for AP mode). AUTHOR
Johannes Berg <> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT BSS_PARAMETER(9)

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CFG80211_AP_S(9) Actions and configuration STRUCT CFG80211_AP_S(9) NAME
struct_cfg80211_ap_settings - AP configuration SYNOPSIS
struct cfg80211_ap_settings { struct cfg80211_chan_def chandef; struct cfg80211_beacon_data beacon; int beacon_interval; int dtim_period; const u8 * ssid; size_t ssid_len; enum nl80211_hidden_ssid hidden_ssid; struct cfg80211_crypto_settings crypto; bool privacy; enum nl80211_auth_type auth_type; int inactivity_timeout; u8 p2p_ctwindow; bool p2p_opp_ps; const struct cfg80211_acl_data * acl; bool radar_required; }; MEMBERS
chandef defines the channel to use beacon beacon data beacon_interval beacon interval dtim_period DTIM period ssid SSID to be used in the BSS (note: may be NULL if not provided from user space) ssid_len length of ssid hidden_ssid whether to hide the SSID in Beacon/Probe Response frames crypto crypto settings privacy the BSS uses privacy auth_type Authentication type (algorithm) inactivity_timeout time in seconds to determine station's inactivity. p2p_ctwindow P2P CT Window p2p_opp_ps P2P opportunistic PS acl ACL configuration used by the drivers which has support for MAC address based access control radar_required set if radar detection is required DESCRIPTION
Used to configure an AP interface. AUTHOR
Johannes Berg <> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT CFG80211_AP_S(9)

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