300-410 Question 259
Select 3A network administrator is tasked with transferring a new router configuration file to a remote Cisco router using TFTP. The transfer fails, and the administrator notices that the TFTP server is reachable, but the transfer does not start. Which of the following are likely causes of this issue?
- A
The TFTP server does not have the correct permissions set for the configuration file.
- B
The TFTP server is configured to use TCP instead of UDP.
- C
The TFTP server's root directory is incorrectly set.
- D
The router does not have an IP address configured on the interface used for the transfer.
- E
The TFTP server is using an unsupported encryption protocol.
Show answer and explanation
Correct answers: A, C, D
Explanation
TFTP is a lightweight protocol that relies on proper file permissions, a correctly configured server root directory, and a functional network interface on the router. If any of these elements are misconfigured, the file transfer will fail. While TFTP does not use encryption or TCP, these details are unrelated to the problem in this scenario, making options 2 and 5 incorrect.
- A. Correct.
If the TFTP server does not have the correct permissions for the configuration file, the file transfer will fail. TFTP requires read/write access to the file depending on the operation.
- B. Incorrect.
TFTP uses UDP, not TCP, for its file transfers. A server configured to use TCP would not even respond to TFTP requests, so this is not a likely cause.
- C. Correct.
The root directory of the TFTP server must be properly set to locate the requested file. If the file is outside the root directory, the transfer will fail.
- D. Correct.
The router must have an IP address configured on the interface used to communicate with the TFTP server. Without an IP address, the router cannot initiate or complete the transfer.
- E. Incorrect.
TFTP does not natively support encryption. This option is irrelevant to the issue described in the scenario.