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578 17. 18 (Security (Network Security - infrastructure security
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578 17. 18 (Security, Each provider 有自己的protocols --> own autonomous system (AS) --> independent to others
Internet Gateway protocols --> protocols that run under AS --> replaced by broader gateway protocols (BGP)
--> two scalability issue --> routing scalability, address utilization, TCP, Transport Layer -> TCP, UDP
why use? give some limitation to network layer
--> network layer 為了隱藏通訊間的差異性, 看起來像是直接通訊 --> transport layer --> provide end-to-end service to application)