增加 TCP 笔记。

.obsidian/appearance.json

@@ -2,5 +2,6 @@
   "accentColor": "",
   "textFontFamily": "等线",
   "interfaceFontFamily": "等线",
-  "monospaceFontFamily": "Consolas"
+  "monospaceFontFamily": "Consolas",
+  "baseFontSize": 20
 }

.obsidian/workspace.json

@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "docs/Network/Network Tips.md",
+                "file": "docs/Network/运输层：TCP.md",
                 "mode": "source",
                 "source": false
               }
@@ -85,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "docs/Network/Network Tips.md",
+                "file": "docs/Network/运输层：TCP.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -102,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "docs/Network/Network Tips.md",
+                "file": "docs/Network/运输层：TCP.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -125,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "docs/Network/Network Tips.md"
+                "file": "docs/Network/运输层：TCP.md"
               }
             }
           }
@@ -149,18 +149,23 @@
   },
   "active": "044546147249fa2a",
   "lastOpenFiles": [
-    "docs/Network/网络层：IP.md",
-    "docs/Network/Network Tips.md",
-    "docs/Network/网络层：TCP.md",
-    "docs/Network/运输层：介绍.md",
+    "docs/index.md",
+    "mkdocs.yml",
+    "docs/Network/运输层：TCP.md",
     "docs/Network/运输层：UDP.md",
+    "docs/Network/运输层：介绍.md",
+    "docs/OS/汇编——寻址方式.md",
+    "docs/Linux/时间.md",
+    "docs/Linux/定时任务.md",
+    "docs/Linux/磁盘分区挂载.md",
+    "docs/Linux/查找文件.md",
+    "docs/Linux/Linux 清理 PG WAL 日志.md",
+    "docs/Network/Network Tips.md",
+    "docs/Network/网络层：IP.md",
     "docs/Network/网络层：ICMP.md",
     "docs/MySQL/MySQL Tips.md",
-    "mkdocs.yml",
-    "docs/index.md",
     "docs/Linux/网络.md",
     "docs/Linux/curl.md",
-    "docs/Linux/磁盘分区挂载.md",
     "docs/OS/汇编——介绍.md",
     "docs/OS/并发——锁.md",
     "docs/OS/并发——多线程.md",
@@ -170,12 +175,6 @@
     "docs/Algorithms/求解算数表达式的值.md",
     "docs/ML/Keras 入门.md",
     "docs/DM/达梦安装.md",
-    "docs/Reading/读书计划.md",
-    "docs/Reading/2023.md",
-    "docs/Reading/2022.md",
-    "docs/Reading/2021.md",
-    "docs/MySQL/MySQL 配置主从.md",
-    "docs/MySQL/备份 MySQL.md",
     "overrides/partials/footer.html",
     "overrides/partials/comments.html",
     "docs/index.html",

docs/Network/网络层：TCP.md → docs/Network/运输层：TCP.md

@@ -1,3 +1,24 @@
+
+笔记
+
+TCP 使用 IP 的服务把一个个报文段交付给接收方，但是连接本身是由 TCP 控制的。如果一个报文段丢失或收到损伤，那么这个报文段就被重传，IP 并不知道 TCP 的重传行为；如果一个报文段没有按序到达，那么 TCP 会保留它，直到丢失的报文达到为止，但是 IP 并不知道这个重新排序的过程。
+
+TCP 首部的窗口大小是由接收方决定的，发送方服从接收方的指示。只有当一个报文段中包含了确认时，定义窗口大小才有意义。
+
+三向握手
+
+客户端主动打开，C->S 发送报文，seq: 800，SYN。
+!!! note "SYN 报文段不携带任何数据，但是它要消耗一个序号。"
+
+服务端被动打开，S->C发送报文，seq: 1500，ack: 801，SYN，ACK，rwnd: 5000。
+!!! note "SYN + ACK 报文段不携带任何数据，但是它要消耗一个序号。"
+
+客户端确认，C->S发送报文，seq: 800，ack: 1501，ACK，rwnd: 3000。
+!!! note "ACK 报文段如果不携带数据就不消耗序号。"
+
+
+
+
 Java 实现 Echo 协议代码。
 ```java
 package com.haizhi.hivetest;  

mkdocs.yml

@@ -69,9 +69,11 @@ nav:
       - OS/并发——锁.md
       - OS/汇编——介绍.md
       - OS/汇编——环境搭建.md
-      - OS/汇编——寄存器介绍.md
+    #   - OS/汇编——寄存器介绍.md
       - Network/网络层：IP.md
       - Network/网络层：ICMP.md
+      - Network/运输层：UDP.md
+      - Network/运输层：TCP.md
 #      - OS/并发——可视性的问题.md
 #      - OS/并发——条件变量.md
 #      - OS/并发——信号量.md