There is no "best" book on any technical subject. It depends on your background of knowledge, whether you want an overview or detailed understanding, and for TCP/IP it usually takes a series of books to completely describe it.
tcpip version 4 is 32 bit where as tcpip v6 is 128bit tcpip 6 can accomadate blillion of bliions ip addresses
INTERNET
Yes.
The comand is: netstat
tcp/ip is good....
IP Datagram
ipconfig
SNMP
IPX/SPX
you tell me
Routing
IP (internet protocol)