Idk

config/network/security.md

@@ -6,6 +6,8 @@ breadcrumbs:
 ---
 {% include header.md %}
 
+**TODO**: Distribute this into relevant pages. Maybe the theory section.
+
 ## Hosts
 
 - Smurf and Fraggle attacks:

it/network/routing.md

@@ -68,7 +68,7 @@ breadcrumbs:
 - eBGP peers are generally required to be directly connected, which is enforced by using an IP TTL of 1. This limit may be relaxed by using multihop sessions. iBGP however is not subject to thus requirement.
 - The synchronization rule: When a router receives a new route to announce from iBGP, it must first wait until it can validate the route from the IGP (in case iBGP is faster). This prevents announcing over eBGP a route that can't yet be routed within the AS.
 - Full BGP tables are exchanged only during the start of peer sessions. Thereafter, only new announcements or withdrawals are exchanged.
-- Network layer reachability information (NLRI) is basically what BGP calls prefixes (and some extra information for address families other than IPv4).
+- Network layer reachability information (NLRI) is basically what BGP calls prefixes/routes (and some extra information for address families other than IPv4).
 - Message types:
     - Open: The first message sent when starting a session, for identifying eachother's capabilities and exchange basic information (not routes).
     - Update: Exchanges new route advertisements or withdrawals.
@@ -91,7 +91,7 @@ Some important attributes:
 - Multi-exit discriminator (MED) (optional, non-transitive): When two ASes peer with multiple eBGP peerings, this number signals which of the two eBGP peerings should be used for incoming traffic (lower is preferred). This is only of significance between friendly ASes as ASes are selfish and free to ignore it (other alternatives for steering incoming traffic are AS path prepending, special communities and (as a very last resort) advertising more specific prefixes).
 - Local preference (well-known, discretionary, non-transitive): A number used to prioritise outgoing paths to another AS (higher is preferred).
 - Weight (Cisco-proprietary): Like local pref., but not exchanged between iBGP peers.
-- Community (optional, transitive): A text string which may be used for routing decisions by carrying arbitrary information between AS peers. There exists a few well-known communities.
+- Community (optional, transitive): A bit of extra information used to group prefixes that should be treated similarly within or between ASes. There exists a few well-known communities such as "internet" (advertise to all neighbors), "no-advertise" (don't advertise toBGP neighbors), "no-export" (don't export to eBGP neighbors) and "local-as" (don't advertise outside the sub-AS).
 
 ### Path Selection
 

media/audio/basics.md

@@ -7,34 +7,33 @@ breadcrumbs:
 {% include header.md %}
 
 - Bands:
-  - Lows (ca. 20Hz-100Hz)
-  - Low midrange (ca. 100Hz-1kHz)
-  - High midrange (ca. 1kHz-10kHz)
-  - Highs (ca. 10kHz-20kHz)
+    - Lows (ca. 20Hz-100Hz)
+    - Low midrange (ca. 100Hz-1kHz)
+    - High midrange (ca. 1kHz-10kHz)
+    - Highs (ca. 10kHz-20kHz)
 - Signal levels:
-  - +4dBu: Professional equipment.
-  - -10dBV: Consumer equipment. Lower than +4dBu. Not to be confused with dB**v**.
-  - Phono: Old, for turntables etc. Much lower voltage than line level. Typically needs a phono preamp/stage with RIAA equalization.
-  - Not to be confused with SPL dB.
+    - +4dBu: Professional equipment.
+    - -10dBV: Consumer equipment. Lower than +4dBu. Not to be confused with dB**v**.
+    - Phono: Old, for turntables etc. Much lower voltage than line level. Typically needs a phono preamp/stage with RIAA equalization.
+    - Not to be confused with SPL dB.
 - Balance mode:
-  - Unbalanced: Ground and signal.
-  - Balanced: Ground and hot and cold signal with equal impedance. The cold signal is 0V but not (directly) connected to ground.
-  - Differential: Balanced but the cold signal is the opposite voltage of the hot signal instead of 0V.
-  - Balanced and unbalanced mono plugs/sockets can generally be connected together (with the loss of the balanced signal), but don't connect e.g. a stereo unbalanced TRS to a mono balanced TRS. It'll sound weird due to the signal mismatch.
+    - Unbalanced: Ground and signal.
+    - Balanced: Ground and hot and cold signal with equal impedance. The cold signal is 0V but not (directly) connected to ground.
+    - Differential: Balanced but the cold signal is the opposite voltage of the hot signal instead of 0V.
+    - Balanced and unbalanced mono plugs/sockets can generally be connected together (with the loss of the balanced signal), but don't connect e.g. a stereo unbalanced TRS to a mono balanced TRS. It'll sound weird due to the signal mismatch.
 - Ground loops:
-  - When there exists physical loop in the ground wires. Typically when devices are connected to different grounded power outlets.
-  - Different potentials in the loop will cause undesired current flow.
-  - Can be heard as a 50Hz/60Hz hum in the audio signal.
-  - Solutions:
-    - Use balanced signals.
-    - Connect all equipment to a single grounding point, i.e. a single power outlet.
-    - Break the shielding on one cable to break the loop. Different boxes, like DI units, may have this as a feature known as a ground lift. However, make sure all shields are connected at one end. Don't break the shielding/earthing on devices that needs it for safety reasons!
-    - Use a ground loop isolation transformer.
-    - Group the ground cables together so no currents get induced into the cables.
-    - Use a resistor and/or a ferrite bead to limit AC current.
-- Phantom power:
-  - Applies 48V to XLR3 (or similar) mic inputs. Applying this to devices which aren't made for it can break them.
-- Impedance:
-  - Basically resistance but for AC.
+    - When there exists physical loop in the ground wires. Typically when devices are connected to different grounded power outlets.
+    - Different potentials in the loop will cause undesired current flow.
+    - Can be heard as a 50Hz/60Hz hum in the audio signal.
+    - Solutions:
+        - Use balanced signals.
+        - Connect all equipment to a single grounding point, i.e. a single power outlet.
+        - Break the shielding on one cable to break the loop. Different boxes, like DI units, may have this as a feature known as a ground lift. However, make sure all shields are connected at one end. Don't break the shielding/earthing on devices that needs it for safety reasons!
+        - Use a ground loop isolation transformer.
+        - Group the ground cables together so no currents get induced into the cables.
+        - Use a resistor and/or a ferrite bead to limit AC current.
+- Phantom power: Applies 48V to XLR3 (or similar) inputs, for powering mics and similar. Applying this to devices which aren't made for it can break them.
+- Impedance: Basically resistance but for AC.
+- Proximity effect: Increase of low frequency response when a audio source is close to a directional or cardioid microphone.
 
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