diff --git a/B. 第二阶段/拓扑练习/0903_项目实战 - 1.md b/B. 第二阶段/拓扑练习/0903_项目实战 - 1.md
index 90e706c..fd1a27f 100644
--- a/B. 第二阶段/拓扑练习/0903_项目实战 - 1.md	
+++ b/B. 第二阶段/拓扑练习/0903_项目实战 - 1.md	
@@ -1,4 +1,4 @@
-# 项目实战 - 1
+# 项目实战 - 基础交换网络设计
 
 ![image-20240903094302311](https://picgo-noriu.oss-cn-beijing.aliyuncs.com/Images/image-20240903094302311.png)
 
@@ -72,6 +72,8 @@
 
 ### 二、DHCP
 
+#### 1、配置
+
 - **AR3 - DHCP**
 
   ```
@@ -99,22 +101,22 @@
 
   ```
   [HX-SW5]dhcp enable 
-  [HX-SW5]int vlan 10
+  [HX-SW5]int Vlanif 10
   [HX-SW5-Vlanif10]ip add 192.168.10.251 24
   [HX-SW5-Vlanif10]dhcp select relay
   [HX-SW5-Vlanif10]dhcp relay server-ip 192.168.50.1
-  [HX-SW5-Vlanif10]int vlan 20
+  [HX-SW5-Vlanif10]int Vlanif 20
   [HX-SW5-Vlanif20]ip add 192.168.20.251 24
   [HX-SW5-Vlanif20]dhcp select relay
   [HX-SW5-Vlanif20]dhcp relay server-ip 192.168.50.1
-  [HX-SW5-Vlanif20]int vlan 30
+  [HX-SW5-Vlanif20]int Vlanif 30
   [HX-SW5-Vlanif30]ip add 192.168.30.251 24
   [HX-SW5-Vlanif30]dhcp select relay
   [HX-SW5-Vlanif30]dhcp relay server-ip 192.168.50.1
   ```
   
 
-### 三、测试
+#### 2、测试
 
 - **PC1	*[VALN10]***
 
@@ -159,4 +161,89 @@
   Gateway...........................: 192.168.30.254
   Physical address..................: 54-89-98-F9-38-81
   DNS server........................: 8.8.8.8
-  ```
\ No newline at end of file
+  ```
+
+
+
+****
+
+
+
+### 三、VLAN间通信
+
+> 要实现vlan间通信需修改vlanif的IP地址，修改为DHCP分配的网关地址
+
+#### 1、配置
+
+- **HX - SW5**
+
+  ```
+  [HX-SW5]int Vlanif 10
+  [HX-SW5-Vlanif10]ip add 192.168.10.254 24
+  [HX-SW5-Vlanif10]int Vlanif 20
+  [HX-SW5-Vlanif20]ip add 192.168.20.254 24
+  [HX-SW5-Vlanif20]int Vlanif 30
+  [HX-SW5-Vlanif30]ip add 192.168.30.254 24
+  ```
+
+#### 2、测试
+
+- **PC1  PING  PC2**
+
+  ```
+  PC1>ping 192.168.20.253
+  
+  Ping 192.168.20.253: 32 data bytes, Press Ctrl_C to break
+  From 192.168.20.253: bytes=32 seq=1 ttl=127 time=109 ms
+  From 192.168.20.253: bytes=32 seq=2 ttl=127 time=78 ms
+  From 192.168.20.253: bytes=32 seq=3 ttl=127 time=79 ms
+  From 192.168.20.253: bytes=32 seq=4 ttl=127 time=78 ms
+  From 192.168.20.253: bytes=32 seq=5 ttl=127 time=78 ms
+  
+  --- 192.168.20.253 ping statistics ---
+    5 packet(s) transmitted
+    5 packet(s) received
+    0.00% packet loss
+    round-trip min/avg/max = 78/84/109 ms
+  ```
+
+- **PC1  PING  PC3**
+
+  ```
+  PC1>ping 192.168.30.253
+  
+  Ping 192.168.30.253: 32 data bytes, Press Ctrl_C to break
+  From 192.168.30.253: bytes=32 seq=1 ttl=127 time=94 ms
+  From 192.168.30.253: bytes=32 seq=2 ttl=127 time=78 ms
+  From 192.168.30.253: bytes=32 seq=3 ttl=127 time=79 ms
+  From 192.168.30.253: bytes=32 seq=4 ttl=127 time=93 ms
+  From 192.168.30.253: bytes=32 seq=5 ttl=127 time=94 ms
+  
+  --- 192.168.30.253 ping statistics ---
+    5 packet(s) transmitted
+    5 packet(s) received
+    0.00% packet loss
+    round-trip min/avg/max = 78/87/94 ms
+  ```
+
+- **PC2  PING  PC3**
+
+  ```
+  PC2>ping 192.168.30.253
+  
+  Ping 192.168.30.253: 32 data bytes, Press Ctrl_C to break
+  From 192.168.30.253: bytes=32 seq=1 ttl=127 time=94 ms
+  From 192.168.30.253: bytes=32 seq=2 ttl=127 time=78 ms
+  From 192.168.30.253: bytes=32 seq=3 ttl=127 time=94 ms
+  From 192.168.30.253: bytes=32 seq=4 ttl=127 time=78 ms
+  From 192.168.30.253: bytes=32 seq=5 ttl=127 time=78 ms
+  
+  --- 192.168.30.253 ping statistics ---
+    5 packet(s) transmitted
+    5 packet(s) received
+    0.00% packet loss
+    round-trip min/avg/max = 78/84/94 ms
+  ```
+
+  
+