Absolutely! Let's walk through your scenario step-by-step, as you requested. **We’ll focus on why your ping test does not work in your network topology**, and what you should check or fix. --- ### **Step 1: Introduction to the Concept** **Ping Test in Networking:** A ping test is a basic network troubleshooting tool that checks the connectivity between two devices in a network. If the ping test fails, it means that one device cannot communicate with another, which could be due to misconfiguration, physical disconnection, or a security block. --- ### **Step 2: Common Reasons Why Ping Fails in VLAN Environments** Looking at your topology, you have multiple VLANs (Virtual LANs) and routers. Here are some usual culprits: 1. **VLAN Misconfiguration:** Are the devices and switch ports assigned to the correct VLANs? 2. **Inter-VLAN Routing:** Is your router (or Layer 3 switch) configured to route traffic between VLANs? 3. **IP Addressing Issues:** Are the devices in the correct IP subnets and do they have the right gateway? 4. **Physical Connection Issues:** Are cables, connections, and network interfaces up and configured? 5. **Firewall/ACLs:** Are there any access control lists or firewalls blocking ICMP traffic (ping)? --- ### **Step 3: Troubleshooting Steps** 1. **Check VLAN Assignment:** - Ensure each PC and switch port are set to the correct VLAN. - Example: PC1 and PC2 should be in VLAN 10, and so on. 2. **Verify IP Addressing:** - Each device should have an IP in its VLAN’s subnet. - Default gateways should be set to the router's sub-interface IP for that VLAN. 3. **Inter-VLAN Routing:** - On the router, make sure you have sub-interfaces for each VLAN, with correct encapsulation and IP addresses. - Example: ``` interface Gig0/1.10 encapsulation dot1Q 10 ip address 204.15.5.1 255.255.255.224 ``` 4. **Physical Connections:** - Confirm cables are connected and interfaces are up (no red X or down status). 5. **Firewall/ACLs:** - Check there are no rules blocking ICMP traffic between VLANs. --- ### **Step 4: Final Answer in Few Sentences** **If your ping test does not work, you should check VLAN configuration on switches, verify correct IP addresses and gateways, ensure Inter-VLAN routing is properly set up on your router, check all physical connections, and make sure there are no firewall/ACL rules blocking ICMP traffic. Fixing any misconfiguration in these areas should resolve your ping issues.** --- ### **Step 5: Summary of What We Did** - **Step 1:** Introduced the ping test concept and its role in troubleshooting. - **Step 2:** Listed common reasons for ping failure in VLAN-based networks. - **Step 3:** Provided a clear, step-by-step troubleshooting guide for your scenario. - **Step 4:** Summarized the solution in a few sentences. - **Step 5:** Reviewed the process followed. --- **In summary:** You learned how to systematically identify and fix ping test issues in a VLAN and router-based network.