DNSの構成

• 　　　 Local Host | Foreign

• |

• +---------+ +----------+ | +--------+

• | | user queries | |queries | | |

• | User |-------------->| |---------|->|Foreign |

• | Program | | Resolver | | | Name |

• | |<--------------| |<--------|--| Server |

• | | user responses| |responses| | |

• +---------+ +----------+ | +--------+

• | A |

• cache additions | | references |

• V | |

• +----------+ |

• | cache | | (RFC1035より)

• +----------+ |