•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.