CS 145A Lab 2(due: Nov 1st)

Protocol Design

Tasks for Lab 2: Design a simple protocol

• Two machines talk with each other
• Either machine is able to establish the conversation.
• During the conversation, if one machine sends some message to the other machine, the other machine displays the message on the screen.
• If one machine does not want to talk any more (or dies, or is disconnected from the network), the other machine should have a way to know about that. (although maybe after some delay – the delay should be bounded.)

Assumption on Underlying Layer:

• We can use TCP (reliable connection)
• The TCP may return error when you tries to do socket operations. (not so “reliable”!!!)

Requirements:

• Read RFC 2119.
• Use state transition graph to help you design
• Use texts to specify the details (use the key words as defined in RFC 2119)
• Think about different scenarios to test your design
  

Submission:

As homework.

Grading:

• Correctness and Completeness (80%)
• Feasibility (20%)
  

Tip:

• "What kind of error may I get from TCP?" -- Read the man page for the socket commands we used in lab1.
• "What kind of strange situation may I get?" -- Use check the input set of the state transition graph in your design.