diff --git a/content/notes/19-network-layer-data-plane.md b/content/notes/19-network-layer-data-plane.md
new file mode 100644
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+---
+title: "19-network-layer-data-plane"
+aliases: 
+tags: 
+- cosc203
+- lecture
+---
+
+- transport layer messages are divided into segments
+- passed to network layer
+	- sender: encapsulates segments into IP packets, passes to link layer
+	- reciever: deliver segments to tranport layer protocol
+	- sender and reciever are connected by multple routers
+- routers
+	- examine header fields in all IP packets passing through it
+	- moves IP packers from input ports to output ports to transfer packets along end-end path
+- network layer protocols
+	- IP
+	- internet control message protocol (ICMP)
+		- use for troubleshooting type things
+
+![packet diagram](https://i.imgur.com/Y9ue6gE.png)
+
+# Forwarding
+move packets from  a routers input link to appropriate output link
+	
+
+# Routing
+
+
+# Routers
+
+# IP addressing
+
+# IPv6
\ No newline at end of file
diff --git a/content/notes/cosc-203.md b/content/notes/cosc-203.md
index 7a521acb9..52e93347b 100644
--- a/content/notes/cosc-203.md
+++ b/content/notes/cosc-203.md
@@ -47,7 +47,7 @@ tags:
 - [16-networks](notes/16-networks)
 - [17-application layer](notes/17-app-layer)
 - [18-transport layer](notes/18-transport-layer)
-- [19-network layer data plane]
+- [19-network layer data plane](19-network-layer-data-plane)
 - [20-network layer control plane]
 - [21-data link layer and LAN]
 - [22-LAN and physical layer]