Notes:

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• application layer protocol HTTP, POP3, NNTP, GOPHER .

• transport layer protocol TCP UDP

• TCP connection-oriented protocol application virtual circuit .

• UDP connectionless protocol .

• TCP segment UDP segment port port .

• transport layer application layer port . FTP transport layer port 21 .

• application protocol port port well-known port . DNS protocol TCP UDP segment Port 53 . Port 53 . 1024 , 1024 port .

• application protocol port .

• tcp udp .

• Internet Layer IP, ICMP, ARP, RARP protocol .

• IP connectionless delivery protocol . connection-oriented delivery TCP .

• ip, icmp .

Notes:

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• 32bits IP Address Network Number Host Number . Class 3 Class A, Class B, Class C

• IP Address Class Network Number .

• IP Address 10 4 .
  • 164.124.116.5
  • 130.1.88.55
  • 203.252.3.1

• Class A IP Address 60.1.2.3 Network Number 60 , Host Number 1.2.3 . Host Number 0 60.0.0.0 .

• Class B IP Address 164.124.116.5 Network Number 164.124 , Host Number 116.5 . Host Number 0 164.124.0.0 .

• Class C IP Address 203.252.3.1 Network Number 203.252.3 , Host Number 1 . Host Number 0 203.252.3.0 .

• IP Address KRNIC (http://www.krnic.net/)

• IP Address IANA , Internic

• IP Address . IP Address

Notes:

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• 32bit 1bit 0 Class A IP Address , 1Byte 1 ~ 126 .

• 32bit 2bit 10 Class B IP Address , 1Byte 128 ~ 191 .

• 32bit 3bit 110 Class C IP Address , 1Byte 192 ~ 223 .

• Class Prefix bit Network Number 0 , 1 Network Number .
  • Network Number 0 127
  • Network Number 128.0 191.255
  • Network Number 192.0.0 223.255.255

• Host Number Host Number bit 0 1 .
  • 0 Host Number .
  • 1 broadcast address .
  • 164.124.0.0 broadcast address 164.124.255.255
  • 203.252.3.0 broadcast address 203.255.3.255

Notes:

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• Network Number

• Interface Host Number

• Interface Interface Network Number Host Number .

• A Ethernet Interface Serial Interface IP Address 164.124.0.1 203.252.2.1 .

• serial link Network Number Host Number .

• 6 ( ) 4 Network Number . Class B Network Number 2 Class C Network Number 2 IP Address . IP Address Class C Network Number 4 . Class C Network Number 4 1020 1000 Host Number .

• IP Address Subnetting .

Notes:

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• subnetting IP Address .

• subnetting traffic . ethernet Class B Network Number 164.124 60000 . ethernet CDMA/CD LAN frame , . LAN LAN sub network number .

• subnetting broadcasting message .

• subnetting sub network number .

• netA sub network number 164.124.1.0 .

• netB sub network number 164.124.2.0 .

• netC sub network number 164.124.3.0 .

• netD sub network number 164.124.4.0 .

• sub network number 164.124.255.0 subnetmask .

• Network Number subnetting 164.124.0.0 1 subnnetting sub network number .

• subnetting A routing table
  • 164.124.1.0 164.124.1.1
  • 164.124.2.0 164.124.2.1
  • 164.124.3.0 164.124.2.2
  • 164.124.4.0 164.124.2.2

Notes:

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• netmask IP Address Network Number . Network Number netmask bit 1 Host Number netmask bit 0 .

• Class A IP Address netmask 255.0.0.0 .

• Class B IP Address netmask 255.255.0.0 .

• Class C IP Address netmask 255.255.255.0 .

• netmask Network Number sub network number . sub network number .

• netmask network number sub network number . netmask Class netmask .

• subnetmask bit 10 .
  • 10000000 128
  • 11000000 192
  • 11100000 224
  • 11110000 240
  • 11111000 248
  • 11111100 252
  • 11111110 254
  • 11111111 255

• subnetmask bit 1 . . .
  • 00001111 (not good)
  • 11000011 (not good)

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