What These Differences Imply
•Cost per second of transmission is very high, so…
–Don’t waste transmission opportunities.
•Intra-backbone connectivity might never be end-to-end, so…
–Don’t rely on end-to-end connectivity for protocol operations.  Use store-and-forward techniques.
•End-to-end round trip time may vary from minutes to weeks, so…
–Don’t rely on negotiation or other conversational protocol mechanisms; by the time a conversation converges, the reason for it may have passed.  Make protocol decisions autonomously, locally.