Chapter 1 answers to Chapter 11 TCPIP Protocol

To be honest, I hate csdn's blog layout. A good layout in the TXT file is messy here. No way, I can only record things that I think have gone through the brain.

In the exercises in Chapter 1 and 11, a proper exercise is like this: understand why the Data Length in other parts except the last one must be an integer multiple of 8 bytes?

After referring to chapter 1's explanation of the IP address header and the fragmentation section of rfc791, I think there are 13-bit slice offsets in the IP address header to identify the user data offset of the slice, however, since user data can be up to the power of 2 to 16, that is, 65535 bytes, the offset value is 8 bytes.