Network 두 대 이상, 논리적, 물리적, 연결, PAN(Personal Area Network), LAN(Local, IEE 802.11), MAN(Metropolitan), WAN(Wide), IP(Internet Protocol) address, IPv4(32bit), IPv6(128bit) binary 2^10 = 1024 = 0100 0000 0000 2^ 9 = 0512 = 0010 0000 0000 2^ 8 = 0256 = 0001 0000 0000 2^ 7 = 0128 = 0000 1000 0000 : 255 2^ 6 = 0064 = 0000 0100 0000 : 127 2^ 5 = 0032 = 0000 0010 0000 : 63 2^ 4 = 0016 = 0000 0001 0000 : ..