350-401 Question 598
Select 3A network engineer is tasked with configuring a Cisco router to act as a TFTP server for storing backup configurations of other network devices. After setting up the TFTP server, a client device is unable to upload a file to the TFTP server. Upon investigation, the engineer observes that the TFTP session initiates but fails immediately. Which of the following could be possible reasons for the issue?
- A
The TFTP server does not have write permissions for the directory where the file is being stored.
- B
The client is sending the file using FTP instead of TFTP.
- C
The TFTP server is running an unsupported version of the TFTP protocol.
- D
The TFTP server is blocking the upload due to file size limitations.
- E
A firewall between the client and the TFTP server is blocking UDP port 69.
Show answer and explanation
Correct answers: A, B, E
Explanation
When troubleshooting TFTP upload issues, the network engineer should verify that the TFTP server has proper permissions for the target directory, ensure the client is using the correct protocol (TFTP vs. FTP), and confirm that UDP port 69 is not blocked by a firewall or access control list (ACL). These factors are common reasons for TFTP upload failures in enterprise networks.
- A. Correct.
TFTP servers require proper write permissions for the directory where files will be stored. If the permissions are not correctly set, file uploads will fail.
- B. Correct.
TFTP and FTP are different protocols. If the client mistakenly uses FTP instead of TFTP, the session will fail to complete.
- C. Incorrect.
TFTP does not typically have multiple versions that impact compatibility. This is not a valid reason for the issue.
- D. Incorrect.
TFTP protocol does not enforce file size limitations in standard implementations. This is unlikely to be the cause of the failure.
- E. Correct.
TFTP uses UDP port 69 for initiating file transfers. If this port is blocked by a firewall, the session will fail.