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<br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> <br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> <br /> <b>Warning</b>: Attempt to read property "cat_ID" on false in <b>/home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php</b> on line <b>137</b><br /> IPとは /home/yusuke3183/taikutsu-mccartney.com/public_html/vpn.taikutsu-mccartney.com/wp-content/themes/quadra_biz001/admin/inc/front_page.php on line 137

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IP(Internet Protocol)OSI参照モデルにおいて、第3層のネットワーク層に位置付けられているネットワークプロトコルで、ネットワーク上の機器に対するアドレス割り当てや、そのアドレスをもとにパケットを伝送する役割を持...">
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class="wp-singular post-template-default single single-post postid-161 single-format-standard wp-theme-quadra_biz001 use_header_fix use_mobile_header_fix aa-prefix-taiku-">

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用語解説


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第9回:IP(アイピー)


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IP(Internet Protocol)

OSI参照モデルにおいて、第3層のネットワーク層に位置付けられているネットワークプロトコルで、ネットワーク上の機器に対するアドレス割り当てや、そのアドレスをもとにパケットを伝送する役割を持ちます。簡単に言えば、各機器に住所を割り当てて、そこまでデータを送り届けるためのプロトコルというものです。

IP(Internet Protocol)は、送信データとなるパケットをTCPやUDPといった上位層から受け取ると、IPヘッダという情報を付加し、ネットワークへ送り出します。IPヘッダとは、送信元と送信先のIPアドレスを中心とした情報の集まりで、パケットという小包に貼り付けられた荷札のようなものです。ネットワーク上を流れるパケットは、この荷札をもとに正い宛先へ送られていくのです。

また、IP(アイピー)には経路を選択する方法についても定義されていて、これにより複数のネットワークをまたいだ通信もできるようにしています。実際には、LANと外部のネットワークとを接続する機器であるルーターが、このIPの経路選択(ルーティング)をサポートしており、このルーターから宛先の属するネットワークのルーターへとパケットが送出されていくことで、目的地へ辿り着くようになっているのです。

このような機構によって、世界規模でネットワークを相互に接続したものが、現在広く利用されているインターネットです。

関連用語

>>戻る【第8回:TCP/IP】

>>続く【第10回:TCP(ティーシーピー)】


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第9回:IP(アイピー)


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TOP

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