vault backup: 2022-10-18 12:09:16

content/notes/19-network-layer-data-plane.md

@@ -4,6 +4,9 @@ aliases:
 tags: 
 - cosc203
 - lecture
+sr-due: 2022-10-21
+sr-interval: 3
+sr-ease: 250
 ---
 
 - transport layer messages are divided into segments
@@ -168,3 +171,11 @@ CIDR
 extension headers: ![](https://i.imgur.com/8rM3clb.png)
 differencees: ![](https://i.imgur.com/cWKDpEY.png)
 
+# transition from v4 to v6
+- cant change all router at once
+- will need mixed v4 and v6 routers
+
+tunneling
+- v6 datagram is carried as the payload in v4 datagram among v4 routers ("packet with a packet")
+- used alot with 4G/5G
+- ![example](https://i.imgur.com/h4awnaL.png)

content/notes/20-network-layer-control-plane.md

@@ -0,0 +1,26 @@
+---
+title: "20-network-layer-control-plane"
+aliases: 
+tags: 
+- cosc203
+- lecture
+---
+
+# per-router control vs SDN
+## per router
+- each router runs a routing algorithm
+- router communicate with each other
+- and creates a forwarding table
+
+![](https://i.imgur.com/c5nfT7X.png)
+
+## SDN software defined networking
+a remote controller computes, and install fowarding tables in routers
+
+![](https://i.imgur.com/H73GPsc.png)
+
+# routing algorithms
+
+# routing in the internet
+
+# ICMP

content/notes/cosc-203.md

@@ -48,7 +48,7 @@ tags:
 - [17-application layer](notes/17-app-layer)
 - [18-transport layer](notes/18-transport-layer)
 - [19-network layer data plane](19-network-layer-data-plane)
-- [20-network layer control plane]
+- [20-network layer control plane](20-network-layer-control-plane)
 - [21-data link layer and LAN]
 - [22-LAN and physical layer]