F18-AX: No
Rationale
The routing flowchart queues a frame after selecting or establishing an active next-hop route, and discards it when the available attempts are exhausted. It specifies no retained item awaiting a future contact after that failure. Transport retransmission across a live circuit does not supply the tested staged-contact DTN forwarding; no mailbox or DTN extension is selected.
Assessment method
Pinned release-source analysis and primary protocol review; no runtime execution
Source context
The NET/ROM Protocol, routing flowchart p. 7 (visually inspected)