diff --git a/B. 第二阶段/拓扑练习/0903_项目实战 - 基础交换网络设计.md b/B. 第二阶段/拓扑练习/0903_项目实战 - 基础交换网络设计.md
index fd1a27f..96d4d08 100644
--- a/B. 第二阶段/拓扑练习/0903_项目实战 - 基础交换网络设计.md	
+++ b/B. 第二阶段/拓扑练习/0903_项目实战 - 基础交换网络设计.md	
@@ -1,8 +1,15 @@
 # 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)
+![image-20240903111352230](https://picgo-noriu.oss-cn-beijing.aliyuncs.com/Images/image-20240903111352230.png)
 
-![image-20240902173915624](https://picgo-noriu.oss-cn-beijing.aliyuncs.com/Images/image-20240902173915624.png)
+- **需求**
+  - 公司有三个部门，财务部，市场部，技术部，为了内网安全，给每个部门单独划分一个VLAN
+  - 财务部：vlan10、市场部：vlan20、技术部：vlan30
+  - 公司所有部门，所有VLAN内的主机都通过DHCP服务器分发IP地址
+  - 每个部门，每个VLAN的网关地址都为，192.168.xx.254
+  - SW5中每个vlanif 虚接口地址都为 192.168.xx.254
+  - SW5通过vlanif50与DHCP进行通信，DHCP服务器管理IP：192.168.50.1
+  - 所有的PC都通过SW5与DHCP服务器进行通信，获取IP地址，所以SW5是DHCP中继
 
 ### 一、IP、VLAN、Routing
 
@@ -102,15 +109,15 @@
   ```
   [HX-SW5]dhcp enable 
   [HX-SW5]int Vlanif 10
-  [HX-SW5-Vlanif10]ip add 192.168.10.251 24
+  [HX-SW5-Vlanif10]ip add 192.168.10.254 24
   [HX-SW5-Vlanif10]dhcp select relay
   [HX-SW5-Vlanif10]dhcp relay server-ip 192.168.50.1
   [HX-SW5-Vlanif10]int Vlanif 20
-  [HX-SW5-Vlanif20]ip add 192.168.20.251 24
+  [HX-SW5-Vlanif20]ip add 192.168.20.254 24
   [HX-SW5-Vlanif20]dhcp select relay
   [HX-SW5-Vlanif20]dhcp relay server-ip 192.168.50.1
   [HX-SW5-Vlanif20]int Vlanif 30
-  [HX-SW5-Vlanif30]ip add 192.168.30.251 24
+  [HX-SW5-Vlanif30]ip add 192.168.30.254 24
   [HX-SW5-Vlanif30]dhcp select relay
   [HX-SW5-Vlanif30]dhcp relay server-ip 192.168.50.1
   ```
@@ -165,85 +172,15 @@
 
 
 
-****
 
 
 
-### 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
-  ```
-
-