May 2019
Beginner to intermediate
296 pages
6h 58m
Japanese
Content preview from IT用語図鑑 ビジネスで使える厳選キーワード256
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60
関連用語
用語に関連する話
用語の使用例
TCP
と
UDP
通 信に求められる信頼 性と速 度を実現する
ネットワーク上の 通信が 混雑 するなどの 理由でデータが 相 手に正しく届かないことを防ぐた
めに、重複や順序エラー、不達などをチェックし、問題があれば再送を行うなどの制御を
行うプロトコルに TCP がある。TCP の使用により、アプリケーションでこのような制御が
不 要になる。このような制 御が 不 要 で 、スピードが 要 求される場 面で は U D P を使う。
パケット通信に必須の制御
道路での渋滞のように、データが
集中して混雑している状態を「輻
輳（ふくそう）」と言い、この輻輳
を回避したり回復させたりする
ことを輻輳制御と言う。
3ウェイ・ハンドシェイク
相手が通信できる状態か確認す
るため、「SYN（聞こえますか?）」
「ACK（聞こえます）」というパケッ
トを3段階でやり取りする手順を
3ウェイ・ハンドシェイクと言う。
UDPを使うVoIP
ネットワーク経由で音声をリア
ルタイムで送る技術にVoIP があ
り、IP 電話などに使われている。
会話しやすいよう遅延の少ない
UDPを使う。
少し遅れても
全員乗っているか
チェックしないと
▶
てぃーしー ぴ ー
▶
ゆーでぃーぴー
Keyword
045
「インターネットで 動画を見るときは U D Pが 使 わ れているみたい だよ。」
プロトコルと OSI 参照モデル
……P55
IP アドレスとポート番号
……P56
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.