Autosave: 2024-08-15 08:00:03

zk/Internet_Layer_of_Internet_Protocol.md

@@ -1,10 +1,35 @@
 ---
 title: Internet_Layer_of_Internet_Protocol
-tags: []
+tags: [network, internet]
 created: Thursday, August 15, 2024
 ---
-# Internet_Layer_of_Internet_Protocol
 
+# Internet Layer of the Internet Protocol Suite
 
+The Internet Layer is concerned with establishing the basis for the connection
+and communication between hosts accross the internet.
 
+In order for the data to get from a machine on one local network to a machine on
+another local network, each machine must have a way of identifying and
+interfacing with the other.
 
+The Internet Layer utilises the Internet Protocol to determine how devices will
+be publicly identified to devices on other networks and how different devices on
+the same local network will be distinguished from outside of this network. This
+is achieved through Internet Protocol (IP) addresses.
+
+## Packets
+
+Data is sent accross the internet between hosts as _packets_. These packets,
+when sent and received within the
+![Link Layer](Link_Layer_of_Internet_Protocol.md) on the local network, are
+enclosed within a Link Layer frame (in its payload section):
+
+![Internet Layer packet](../img/internet-layer-packet.png)
+
+Like a frame, an IP packet has a header and a payload. The payload comprises the
+data between sent between hosts. The header contains a source IP address and a
+destination IP address and also specifies which version of the Internet Protocol
+is being used.
+
+// Separate entry on anatomy of IP address

zk/Internet_fundamentals.md

@@ -33,9 +33,11 @@ protocols. From the top:
   sent out into the internet. Ethernet and WiFi are two core protocols utilised
   at this layer.
 
-- The **Internet Layer** is concerned with communication accross networks. It is
-  responsible for identifying hosts on the inter-network by their addresses and
-  routing data from network to network.
+- The
+  ![Internet Layer of Internet_Protocol](Internet_Layer_of_Internet_Protocol.md)
+  is concerned with communication accross networks. It is responsible for
+  identifying hosts on the inter-network by their addresses and routing data
+  from network to network.
 
 - The **Transport Layer** come back to this
 

zk/Link_Layer_of_Internet_Protocol.md

@@ -43,11 +43,7 @@ a specific MAC address. This is off-limits from the outside.
 Link Layer data is divided into small units called "frames". The anatomy of a
 frame is as follows:
 
-```
---------------------------
-| header | data | footer |
---------------------------
-```
+![Link Layer frame](../img/link-layer-frame.drawio.png)
 
 The header contains the source and destination MAC address plus a descriptor of
 the type of data it contains. The data is the payload. The footer is used to