diff --git a/main.md b/main.md
index 95c0f2f..26405f6 100644
--- a/main.md
+++ b/main.md
@@ -431,12 +431,15 @@ Regn ut 1920x1080 x 24 bits
\\[ 16\ bits \cdot 44100\ Hz \cdot (3 \cdot 60)s \cdot 2\ kanaler \\]
+Note:
+
+tegn en bølge, og vis frekvensen
+
---
## Encoding og Komprimering
- -
- -
+ - "Hvordan tolke dataen"
- Lossless vs lossy
Note:
@@ -453,6 +456,10 @@ Note:
\\[ A6B4A5B2 \\] <!-- .element: class="fragment" data-fragment-index="1" -->
+Note:
+
+Rart for tekst, men gir mening for bilder -> Runlength encoding
+
----
### Eksempel på lossy komprimering
@@ -463,20 +470,86 @@ Dte e en eksmplstnig <!-- .element: class="fragment" data-fragment-index="1" -->
Note:
ikke vanlig for tekst, men akseptabelt for video/lyd/bilde
+Gjøres ofte på tjenester som messenger.
---
# Algoritmer
-
-
+Note:
+Beskriver stegvis og nøyaktig hvordan man løser et problem
+Uten tolkning
+Pseudokode
----
+(Eksempel på pseudokode)
+
---
## Kompleksitet
+<table>
+<tr>
+<td>
+
+\\[ \mathcal{O}(1) \\]
+
+</td>
+<td>
+
+```python
+def f(lst):
+ print('Hi!')
+```
+
+</td>
+</tr>
+<tr>
+<td>
+
+\\[ \mathcal{O}(n) \\]
+
+</td>
+<td>
+
+```python
+def f(lst):
+ for item in lst:
+ print(item)
+```
+
+</td>
+</tr>
+<tr>
+<td>
+
+\\[ \mathcal{O}(n^2) \\]
+
+</td>
+<td>
+
+```python
+def f(lst):
+ for item in lst:
+ for itemOnceMore in lst:
+ print(item, itemOnceMore)
+```
+
+</td>
+</tr>
+</table>
+
+Note:
+brukes mer om dere skal programmere mye
+
+----
+
+Sorteringsalgortimer:
+
+- Bubble sort: \\(\mathcal{O}(n^2)\\)
+- Merge sort : \\(\mathcal{O}(n\ log\ n)\\)
+
---
# Nettverk
@@ -491,9 +564,73 @@ ikke vanlig for tekst, men akseptabelt for video/lyd/bilde
### Historie
-
+- ARPAnet
+
+Note:
+Sponset av Dep. of defense, USA
+Kjellermaskiner, matte
+Ble ikke brukt aktivt hele tiden
+Overføre instruksjoner
+Maksimal utnyttelse
+Flere universiteter koblet seg på
+Ikke veldig planlagt
+
---
+### 5 lags modellen
+
+<img src="./static/graphics/network-stack.svg" width=40%/>
+
+Note:
+pakker
+pakket inn i hverandre
+
+----
+
+### Physical layer
+
+Note:
+Medium for kommunikasjon mellom 2 eller flere endrepunkter
+
+----
+
+### Data link layer
+
+Note:
+Etablert: Kommunikasjonsmedium
+
+Stabil overføring, og kontakt med andre ender
+
+----
+
+### Network layer
+
+Note:
+Etablert: Flere computere er koblet sammen
+
+Kommunikasjon gjennom flere computere.
+
+Oppfører seg litt som postkontorer
+
+----
+
+### Transport layer
+
+
+Note:
+Etablert: Link over mange computere.
+
+Stabil og sikker kommunikasjon til tross for forsvunnede pakker,
+
+----
+
+Etablert: Stabil og sikker kommunikasjon.
+
+Applikasjonsspesifikk data.
+
+---
+
+
# Programvareutvikling
diff --git a/static/graphics/internet.png b/static/graphics/internet.png
new file mode 100644
index 0000000..73211ed
Binary files /dev/null and b/static/graphics/internet.png differ
diff --git a/static/graphics/internet.svg b/static/graphics/internet.svg
index 1b6e9be..496158c 100644
--- a/static/graphics/internet.svg
+++ b/static/graphics/internet.svg
@@ -1,4 +1,4 @@
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diff --git a/static/graphics/network-layers/application-layer.svg b/static/graphics/network-layers/application-layer.svg
new file mode 100644
index 0000000..83b5eb7
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diff --git a/static/graphics/network-layers/data-link-layer.svg b/static/graphics/network-layers/data-link-layer.svg
new file mode 100644
index 0000000..2d97d68
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diff --git a/static/graphics/network-layers/network-layer.svg b/static/graphics/network-layers/network-layer.svg
new file mode 100644
index 0000000..56ce041
--- /dev/null
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+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Do not edit this file with editors other than diagrams.net -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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diff --git a/static/graphics/network-layers/physical-layer (1).svg b/static/graphics/network-layers/physical-layer (1).svg
new file mode 100644
index 0000000..253ebd3
--- /dev/null
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diff --git a/static/graphics/network-layers/transport-layer.svg b/static/graphics/network-layers/transport-layer.svg
new file mode 100644
index 0000000..7d0deb5
--- /dev/null
+++ b/static/graphics/network-layers/transport-layer.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Do not edit this file with editors other than diagrams.net -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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diff --git a/static/graphics/network-stack.svg b/static/graphics/network-stack.svg
new file mode 100644
index 0000000..3f50f06
--- /dev/null
+++ b/static/graphics/network-stack.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Do not edit this file with editors other than diagrams.net -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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\ No newline at end of file
diff --git a/static/graphics/sources/internet.drawio b/static/graphics/sources/internet.drawio
index 9717775..3d623ca 100644
--- a/static/graphics/sources/internet.drawio
+++ b/static/graphics/sources/internet.drawio
@@ -1 +1 @@
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diff --git a/static/graphics/sources/internet.png b/static/graphics/sources/internet.png
new file mode 100644
index 0000000..44aa3d1
Binary files /dev/null and b/static/graphics/sources/internet.png differ
diff --git a/static/graphics/sources/network-stack.drawio b/static/graphics/sources/network-stack.drawio
new file mode 100644
index 0000000..dd84ed5
--- /dev/null
+++ b/static/graphics/sources/network-stack.drawio
@@ -0,0 +1 @@
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