# 第一章：浏览器生成信息
![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefinedd02afa269a54afead0b83cd4aa89f680.image.png)

## ip地址
ip地址一共有32位，由两部分组成，网络号和主机号，为了区分，设计了子网掩码


![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefineda602791921d3cb018306c98333b11c6a.image.png)

## DNS服务
DNS是域名解析
域名具有层级结构，比如blog.yxjxxr.site 就是yxjxxr.site的子域名

域名解析的流程

![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefined3f48c1d48a8e3211388d14d6ac34864e.image.png)
先去找根域名服务器，在顺藤摸瓜，一步步找到到存放目标域名的服务器，从而获取IP地址

## 委托协议栈发送消息
知道了IP地址之后，就可以委托操作系统的协议栈向目标web服务器发送消息了
大概流程如下：
![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefinedf0f7f6c2fcef6cd0116c1f55a338249d.image.png)
1. 创建套接字
2. 连接
3. 传递消息
4. 断开连接

实际负责收发消息的是协议栈，网卡驱动和网卡。

# 第二章：用电信号传输tcp/ip数据 --探索协议与网卡
## 协议栈处理数据发送请求
协议栈是根据套接字中记录的控制信息来工作的。  
### 创建套接字

![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefinedc8a533f638667ea75cfccad3993d0508.image.png)
1. 像浏览器、邮件等一般的应用程序都是使用 TCP 收发数据的，而像 DNS 查询等收发较短的控制数据的时候则使用 UDP。
2. 下面一半是用 IP 协议控制网络包收发操作的部分此外，IP 中还包括 ICMPA 协议和 ARPB 协议。ICMP 用于告知网络包传送过程中产生的错误以及各种控制消息，ARP 用于根据 IP 地址查询相应的以太网 MAC 地址 C。
3. IP 下面的网卡驱动程序负责控制网卡硬件，而最下面的网卡则负责完成实际的收发操作，也就是对网线中的信号执行发送和接收的操作。


![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefinedf8323002ea4240a6d54b2a14906a3bff.image.png)

### 连接服务器
连接的目的是将客户端的请求发送给协议栈，同时客户端向服务端传递连接的请求


![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefined01628b813ed2a66f3620fa71f2693230.image.png)

当知道服务端的IP地址和端口号之后，这些信息会传递给协议栈中的 TCP 模块。然后，TCP 模块会与服务器的 TCP 模块交换控制信息。TCP模块将信息传递给IP模块并委托其发送，信息发送到服务端的IP模块再传到服务端的TCP模块。然后服务器的 TCP 模块会返回响应，向上面一样传回到客户端的TCP模块，然后客户端也需要将 ACK 比特设置为 1 并发回服务器，告诉服务器刚才的响应包已经收到，至此，连接完成（3次握手）

### 数据收发
数据收发操作是从应用程序调用 write 将要发送的数据交给协议栈开始的，协议栈收到数据后执行发送操作
（其中涉及很多很复杂的操作，这里先不写，看看视频教程再进行补充）
### 从服务器断开并删除套接字

![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefined552f1acaa577948088125b0f9d407525.image.png)

![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefinedaa44b1efcbc104ee5813ed23e251c083.image.png)

## IP 与以太网的包收发操作

### 大概流程
![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefinedf342b157e988d5899105e98a4396212a.image.png)
### 包收发操作流程
![image.png](https://tuchuang-yxjxxr.oss-cn-beijing.aliyuncs.com/undefined0783e85b6f186b9363cbe7844667e23f.image.png)
IP 头部中包含 IP 协议规定的、根据 IP 地址将包发往目的地所需的控制信息；MAC 头部包含通过以太网的局域网将包传输至最近的路由器所需的控制信息
### 接下来讲了IP协议的具体工作过程，包括添加报头，将数据包传到网卡发送，将收到的数据返回给TCP协议等等，这里不细讲，等后面见的多了再进行补充

网路是怎样连接的

# 前言
收录英语小短文



# Venti's Wind AI Helper
The wind in Mondstadt always carried the scent of dandelions. Venti sat on the big tree at Windrise, plucking the strings of his lyre and humming a tune, while an apple core rolled beside his feet. Suddenly, he heard soft sobbing coming from Windwail Highland. With a light tap of his toes, he glided over on the wind.

Under a tree, a little girl named Nora was wiping her tears, clutching a wilted Cecilia flower tightly in her hand. "What's the matter? A young lady's tears can even weigh down the wind, you know." Venti landed in front of her, took off his hat, and bowed politely. Nora sniffled and said, "I wanted to pick a Cecilia flower for Mom's birthday present, but the wind on the mountain top was too strong. I didn't get the flower, and my basket got blown away too..."

Venti blinked his green-and-blue eyes, suddenly remembering the "little gadget" Lisa had slipped him the day before—a silver badge inlaid with the wing of a Windwheel Aster. "Don't worry, I have a helper who can talk to the wind." He pinned the badge to Nora's collar and blew gently on it. "This is 'Wind Whisper AI'. It can understand the wind and help us find things."

The badge suddenly lit up with a faint glow. Venti played a lively note on his lyre: "Could you help us find Nora's basket, and also point out the easiest place to pick Cecilia flowers?" The sound of the wind rustling through the treetops suddenly became clear. The light spot on the badge wobbled in one direction, and a soft prompt sound came out: "The basket is twenty steps to the southwest. The platform ahead has gentle wind, and the flowers there are the fullest~"

Nora's eyes widened in surprise. She followed the light spot and quickly retrieved her basket. When they reached the mountain-top platform, the wind there was indeed gentle, and the Cecilia flowers swayed softly in the sunlight. Venti sat aside playing his lyre, while Wind Whisper AI quietly blocked the disruptive strong winds for them. It even swept up a few glistening dewdrops and sprinkled them on the flowers, making them look even more delicate.

After picking the flowers, Nora suddenly remembered something: "Dad said we should write a poem for Mom, but I don't know how..." Venti smiled and pointed at the badge: "It also hides a little poetry magic." A faint light and shadow projected from the badge. Based on what Nora had said—"Mom likes dandelions and can make apple pies"—a few lines of poetry soon appeared: "The wind carries dandelions in a light dance, the oven holds a sweet fragrance. Mom's smile is like a Cecilia, blooming in my heart."

"That's perfect!" Nora hopped and skipped toward home. Venti waved: "Remember to tell Mom that the Anemo Archon (the God of Wind in Genshin Impact, and Venti himself is the incarnation of this god) and his little helper wish her a happy birthday~" After Nora ran far away, the glow of the badge gradually faded. Venti tucked it into his arms, took a sip of dandelion wine. The wind blew past, carrying the sound of distant laughter, and he softly hummed a new song—one that held the gentle secret of AI and the wind.

---

## Glossary of Genshin Impact Exclusive Terms
- **Venti**: The English name of 温迪，a playable character in Genshin Impact. He is the incarnation of the Anemo Archon and loves freedom and music.
- **Mondstadt**: The English name of 蒙德，one of the seven major regions in Genshin Impact. It is a city-state that advocates freedom, with wind as its core element.
- **Windrise**: The English name of 风起地，a landmark in Mondstadt. It has a huge oak tree and is one of Venti's favorite places to stay.
- **Windwail Highland**: The English name of 望风山地，a mountainous area in Mondstadt with open terrain and often strong winds.
- **Cecilia**: The English name of 塞西莉亚花，a rare flower in Mondstadt that grows on high mountains. It is one of Venti's favorite flowers.
- **Windwheel Aster**: The English name of 风晶蝶，a small creature in Mondstadt that is related to the wind element. Its wings glow with a faint blue light.
- **Anemo Archon**: The English name of 风神，one of the seven archons (gods who rule the seven regions) in Genshin Impact, in charge of the wind element and the region of Mondstadt.

英语小短文

讨论

# 前言
记录相关指令


# 下载文件到本地和本地文件传输到服务器
```
scp -P 7001 ubuntu@43.130.227.44:/home/ubuntu/codebase/yexijia/danzi/mnist/demo/requirements.txt "D:\vscode\requirements.txt"
# -p 表示添加端口号，因为有时候服务器反代，所以要设置端口号
```
# 传数据到服务器
```
scp -P 7001 "D:\vscode\requirements.txt" ubuntu@43.130.227.44:/home/ubuntu/codebase/yexijia/danzi/mnist/demo/requirements.txt
```
# ssh连接
```
ssh -p 7001 ubuntu@43.130.227.44
```
https://blog.csdn.net/weixin_44305115/article/details/107677042

linux服务器

# 前言
电分刷分，这篇用来记录电分的复习经历和过程

## 10月12日
截至现在，电分重修班的课上到了戴维南定理和诺顿定理，对于分析一个复杂的线性含源二端网络，都可以等效为一个独立电压源串联电阻的电路。再结合之前学习的KCL,KVL,支路分析法，网孔分析法，节点分析法，回路分析法（前123章），第四章讲了电路的等效，就是电流源，电压源串联等效为什么什么之类的，今天主要是复习一下那几个方法电路分析方法。