September 2018
Intermediate
224 pages
5h 31m
Japanese
Content preview from 図解まるわかり ネットワークのしくみ
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116
Webサイトを見るには HTTPリクエストと HTTPレスポンスのやりと
りがありますが、その前にDNSの名前解決やARPのアドレス解決の動作
も行われています。そして、TCPでのコネクションの確立も行います。簡
単なネットワーク構成を例にして、DNSやARP、TCPも含めたWebサイ
トを見るときの流れを考えましょう。
Webサイトを見るときには、WebブラウザでURLを入力します（図4-18-
❶
）。または、Web ページのリンクをクリックします。
TCP/IPでは必ずIPアドレスを指定しなければいけません。URLに含ま
れているWebサーバのホスト名から、DNSサーバへ問い合わせてWebサ
ーバのIP アドレスを解決します（図 4-18-❷）。
DNSサーバへ問い合わせを送信するときには、イーサネットのMACア
ドレスを求めるためにARP も行われます。
ネットワーク構成例では、ルータがDNSサーバ機能を持っていると想
定しています。ルータ自体には宛先になるWebサーバのIPアドレスはな
いので、ルータからさらにDNS の問い合わせを行います。
WebサーバのIPアドレスがわかれば、そのIPアドレスを指定して Webブ
ラウザとWebサーバアプリケーション間でTCPコネクションを確立します
（図4-19-❸）。
WebブラウザとWebサーバアプリケーション間のTCPコネクションを
確立してから、HTTPリクエストとHTTPレスポンスのやりとりが行われ
ます（図 4-19-❹）。Webブラウザで指定した ...
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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.