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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 /> TCP/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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TCP/IP(ティーシーピーアイピー)インターネットの世界において、標準として用いられているネットワークプロトコルが「TCP/IP(ティーシーピーアイピー)」です。">
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class="wp-singular post-template-default single single-post postid-153 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8回:TCP/IP


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TCP/IP(ティーシーピーアイピー)

インターネットの世界において、標準として用いられているネットワークプロトコルが「TCP/IP(ティーシーピーアイピー)」です。OSI参照モデル第3層 (ネットワーク層)のIPを中心とした、複数プロトコルの集合体を総称してこのように呼びます。

TCP/IPは、主に第4層(トランスポート層)に位置するTCPとの組み合わせによって構成されています。たとえばインターネット上の代表的なサービスであるWWWのHTTPなどは、このプロトコルを基盤として動作しています。

このプロトコルにおいて通信上でやり取りされるデータは、パケットという単位に分けられます。個々のパケットには宛先住所(相手先IPアドレス)が付加されて、これがネットワーク上を、まるでベルトコンベアで流される荷物のように、どんぶらこっこと相手先まで届けられていくわけです。

下位層となるIPは、ネットワーク上における各機器の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、機器の住所を定め、そこまでデータを届けるためのプロトコルというものです。先ほど述べた宛先住所の付加や、ベルトコンベアという役割を担うことになります。

上位層となるTCPは、このパケットの受信確認を行うことで、正しく順番通りにパケットが届けられることを保証します。これによって信頼性の高い、確実なデータ送受信が可能となるわけです。

ただし受信確認やパケットの再送といった手順により、TCPはかなり重めのプロトコルとなっています。そのため、信頼性よりも処理の軽さや速度といった点を重視するUDPというプロトコルも用意されており、用途に応じて使い分けられています。

関連用語

>>戻る【第7回:OSI参照モデル】

>>続く【第9回:IP(アイピー)】


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TOP

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