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obsidian(gyunseo laptop): M src/content/blog/data-communications-and-…
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…networking-chapter-4-lans-part1.md 2023-10-02 00:42:04

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Gyunseo Lee authored and Gyunseo Lee committed Oct 1, 2023
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Expand Up @@ -42,4 +42,6 @@ LLC는 **protocol data unit (PDU)** 을 정의한다.
- control field: for flow and error control
- DSAP and SSAP fields는 source (보내는 쪽의 어플리케이션이 무엇이다. 한글이냐 곰플레이어냐)와 destination (받는 쪽의 어플리케이션이 무엇이다.)에 있는 upper-layer protocol을 정의한다. (랜카드 위에 올라 가는 application protocol이 무엇이냐?)

근데 most upper-layer protocol들은 LLC를 안 쓴다.

## 4.2

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