Solution Manual for ComputerNetworking: A Top-Down Approach, 6/E6th Edition
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Chapter 1 Problems
Problem 1
There is no single right answer to this question. Many protocols would do the trick. Here's a simple answer below: Messages from ATM machine to Server
Msg name purpose -- - HELO Let server know that there is a card in the ATM machine ATM card transmits user ID to Server PASSWD User enters PIN, which is sent to server BALANCE User requests balance WITHDRAWL User asks to withdraw money BYE user all done
Messages from Server to ATM machine [display]
Msg name purpose -- - PASSWD Ask user for PIN [password] OK last requested operation [PASSWD, WITHDRAWL] OK ERR last requested operation [PASSWD, WITHDRAWL] in ERROR AMOUNT sent in response to BALANCE request BYE user done, display welcome screen at ATM
Correct operation:
client server HELO [userid] --> [check if valid userid] [check password]
check if enough $ to cover withdrawl