What happens if the first packet of a TFTP transfer is lost?
- The client will wait indefinitely for the reply.
- The TFTP application will retry the request if a reply is not received.
- The next-hop router or the default gateway will provide a reply with an error code.
- The transport layer will retry the query if a reply is not received.
The TFTP protocol uses UDP for queries, so the TFTP application must implement the reliability, if needed.