7 - Reliable Client Server Comms

Question 1

TCP: Benefits

Answer 1

Masks omission failures (numbered packages requestred again)
Removes duplicates
Does not mask connection failures

Question 2

Remote Procedure Calls: What can go wrong?

Answer 2

Client unable to locate server.
Request message lost.
Server crash.
Reply message lost.
Client crashes.

Question 3

Three approaches to server crashes

Answer 3

At least once delivery
- Resend until reply
At most once delivery
- after timeout, report fail immediately
Guarantee nothing