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+---
+title: "01-network and hardware protocols"
+tags: 
+- cosc301
+- lecture
+---
+
+
+# OSI model
+- physical, data link, network, transport, session, presentation, application
+- encapsulation
+	- ![](https://i.imgur.com/jOSWdJ4.png)
+- Five layers in Internet: physical, data link, network, transport, application (including presentation and session layers of OSI model),
+
+TCP/IP sits in kernel of operating system. packet is passed from RAM to the network card, then through the ethernet cable.
+
+There is a specific bus for tcp/ip between ram and NIC
+
+^ Data link and physical layer.
+
+NIC rejects ehternet packets which aren't adresse to them. you can modify them to add a promoscuous mode which accepts all packets.
+
+you can configure the swtich to send the packets to only the correct address
+
+Network Layer ≡ IP layer
+
+Port number distinguishes addresses at the IP layer
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+---
+title: "cosc-301"
+year: 2022
+semester: 
+tags: 
+- course
+- 
+---
+
+https://www.cs.otago.ac.nz/cosc301/s
+
+# Assignments
+
+# Labs
+
+# Notes
+
+# Lectures
+- [[01-network and hardware protocols]]
+
+# Info
+