---
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)
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
<!-- 武孝的手機是HTC ctrl+/ 快速註解 我媽都說 "網飛" 網飛是洨? netfix 的中文

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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