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content/notes/09-wireless-networking.md
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@ -53,8 +53,9 @@ Ad Hoc mode
Infrastructure mode Infrastructure mode
![](https://i.imgur.com/GuhlwVA.png) ![](https://i.imgur.com/GuhlwVA.png)
> [!INFO] > [!INFO] AP includes services like DHCP and DNS
> eventually connects to wired network
> [!INFO] Infrasrtucture mode can have multiple APs connected together
Basic terminology Basic terminology
- AP: Access Point - AP: Access Point
@ -67,18 +68,25 @@ Basic terminology
- The MAC address of an AP - The MAC address of an AP
- ESSID: Extended Service Set Identifier - ESSID: Extended Service Set Identifier
- The name of the network - The name of the network
> [!INFO] if there is only on AP it is BSS
> if there are more than one AP it is ESS
> each AP in a ESS can have a different configuration
Wireless Distribution System (WDS) Wireless Distribution System (WDS)
- Backbone of multiple APs, and the inter-AP communication. Usually Ethernet, may be wireless. - Backbone of multiple APs, and the inter-AP communication. Usually Ethernet, may be wireless.
- 802.11F defines the Inter Access-Point Protocol (IAPP) - 802.11F defines the Inter Access-Point Protocol (IAPP)
> [!INFO] used for ESS. connected APs togehter
> do handover, access control etc
Signal Strength Signal Strength
- Signal Level: Strength of the received signal - Signal Level: Strength of the received signal
- Noise Level: Strength of the noise - Noise Level: Strength of the noise
- Link Quality: Signal to Noise Ratio (SNR) - Link Quality: Signal to Noise Ratio (SNR) (10:1 is a good ratio) (1:1 is a bad ratio)
- Transmit Power: How loud we speak - Transmit Power: How loud we speak
- Receive Sensitivity: How well we can hear - Receive Sensitivity: How well we can hear
- Decibel: 10*log10(P/P0), which shows the ratio of power of one signal over another. - Decibel: 10*log10(P/P0), which shows the ratio of power of one signal over another.
> [!INFO]
Finding a Network Finding a Network
- Passive scanning listens for AP beacons - Passive scanning listens for AP beacons