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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52
関連用語
用語に関連する話
用語の使用例
パ ケット 通 信 と 回 線 交 換
回線の速度を表す単位
ネットワーク上における1秒あた
りのデータ転送量を示す単位に
bpsがあり、値が大きいほど高速
に通信できることを意味する。実
際には速度よりも効率を表す。
PPPoE
電話回線経由でインターネットに
接続するしくみを、オフィスや自
宅内で使われるLANでも使える
ようにしたプロトコルを PPPoE
と言い、接続に電話回線が不要。
次世代の接続方式
LAN と同じ方法でインターネッ
トに接続する規格に IPoEがあり、
PPPoEの場合に必要なルーター
などの通信機器を用意すること
なく高速に接続できる。
安定した通 信を実 現する
電話回線のように通 信が 始まってから終わるまで 1 本の回線を占有して通 信する方式を回
線交換と言う。誰かが使用しているときは、その回線を他の人が使うことはできない。一
方で、送受信するデータをパケットという単位に細かく区切り、1 つずつ送る方法をパケッ
ト通信と言う。細かく区切ることで、ほぼ同時に複数の人が通信できる。
▶
ぱ け っと つ うし ん
▶
か い せ ん こうか ん
Keyword
037
「災害時に電話が通じなくてもメールが届くのはパケット通信だからか。」
パ ケットとフ レ ー ム
……P63
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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.