1. A Layered Model of Services and Distributed Applications The Red Group Fang, Tal, Devin, George Spring 2002 – CS 294-3

2. General Architecture Services Enhanced IP Devices Access Network Layer 3 Layer 2 Layer 1 Application Service Provider IP Layer 4 Layer 5

3. Core Network Metro Network DSL Cable Modem T13G Last Mile Network Car Network Blue Tooth Infrared Home Network WAN MAN LAN PAN Stock Exchange Company ISP Large Enterprise P 802.11 B 802.11 Layer 1: Access Network

4. Layers 2 and 3 Services Enhanced IP Devices Access Network Layer 3 Layer 2 Layer 1 Application Service Provider IP Layer 4 Layer 5

5. Layer 4: Service Layer Billing Audio Service Video Service Authentication Hardware Composition Layer (Service Selection)/ Coordination Devices Discovery Session layer/Distributed Trigger PKI – UCB Ssh-key Sim card Credit card Username/pw Cookie Amex Access provider Online site Credit card Hotel room

6. Layer 5: Application Service Provider Session Layer Application Composition Layer / failure recovery Device Detection