Assignment task: In describing messages used in most message passing systems, it was observed that header information was usually fixed-length but the data in the message (often called the payload) was usually variable length.
a. What makes this a very efficient way to handle messages, i.e., why is it efficient for headers to be fixed length and payloads to be variable length?
b. How do you know where the payload ends if it is variable length? Is it inefficient if the payload is fixed length and most messages are much shorter than that fixed size?
c. There are two ways to know where the end of a variable length item, like a message payload, is. What are they? Which one does the Internet Protocol v4 use?
Please explain clearly.