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# System prepended metadata

title: 第一堂
tags: [TCP/IP筆記]

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---
title: 第一堂
tags: TCP/IP筆記
---
# Protocls（協定） 
>a set of rule
- Syntax
    - format of the data 定義封包格式
- Semantics
    - meaning of each section of bits 定義封包欄位
- Timing
    - when data should be sent and how fast 寄出資料的時間跟速度
# Internet Standards
- Internet draft 協定原稿
    - six-month lifetime 
    - 六個月後，若被認定則被賦予RFC編號
- RFC (Request for Comments) 
![](https://i.imgur.com/YvSX3jC.png)
![](https://i.imgur.com/uMZEPNT.png)
第五層 Bits - domin name
# Physical Address
- unicast
    - one single recipient
    - 一對一 
- multicast
    - a group of recipients
    - 群播
- broadcast
    - to be received by all systems in the network
    - 廣播
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網易?? ㄎㄅ歐 網修 算了-->
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# Physical Layer
## Ethernet
- IEEE 802.3 standard
- Ethernet evolution
    - standard Ethernet    10 Mbps
    - Fast Ethernet       100 Mbps
    - Gigabit Ethernet      1 Gbps
    - Ten-Gigabit Ethernet 10 Gbps
## WI-FI
- Wi-Fi 802.11
- >WiFi 6:802.11 AX
## T Lines
- T-1 (1.544 Mbps)
- T-3 (44.736 Mbps)
- 粉貴
## sonet
- T Line 的進階
- 還是粉貴
- 速度比較快
## connectionless packet-switched network
- the network layer protocol treats each packet independently
    - 到達目的的路線不一樣使順序會有變化ㄎㄎ，但是中字文順的序不影閱響讀