Test your skills on DHCP Troubleshooting
1. How would you check if a DHCP server is reachable on the network
To test the reachability of a DHCP server on a network, ping the server using from a system on the network which is configured with a static IP address. The server would respond with a reply to the ping.
2. How would you check if the DHCP server is running on the operating system
Use appropriate operating system tools on which the server is installed to check if the service is running. On a Windows system it could be the services tab.
3. What should you check in the TCP/IP adapter of a client as part of troubleshooting DHCP
Check if the TCP/IP adapter of the client is configured as a DHCP client. If configured with static IP address, the client would not attempt to contact the server.
4. Which packet should be sent from the client to contact the server
Use a protocol analyzer like wireshark on the client and check if the client is sending DHCP Discover packets on the network. This confirms that the client is attempting contact with the server.
5. What are the possibilities of DHCP packets sent from the client not reaching the server
Use a protocol analyzer like wireshark to check if the server is receiving the packet. If not, the possibility could be the client and server is on different networks, broadcasts not being sent on the network, connectivity issues etc.
6. Which packet should be sent by the server to the client.
Use a protocol analyzer like wireshark on the client and check if the server is sending DHCP offer packet as response to the client requests. This confirms the server is responding to the requests by the client. If not check the DHCP server logs.
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Comptia network + study guide – TCP/IP Configuration & Troubleshooting Scenarios