day #3

IP Address :
32bit
1Byte . 1Byte. 1Byte. 1Byte
A class : 0
B Calss: 10
C Calss: 110
D Class: 1110


Packet :
Network를 이동하는 Data Block
0~1023은 예약
TCP/UDP 따로 구분됨


Process:
Main Memory 상에 실행중인 Program


sockaddr_in.sinfamily = AF.NET
AF(Address Protocol Family)를 사용할 것


Network Byte Sequence :
Motorola 68000 -> Big-Endian 사용
Intel X86 -> Little-Endian 사용
따라서, Data 전송시 통일 시킴 -> Big-Endian 만을 사용


Endian-Conversion :
htons : host byte -> network byte - short
ntohs : network byte -> host byte - short
htonl : host byte -> network byte - long
ntohl : network byte -> host byte - long