May 2024
Intermediate
248 pages
6h 59m
Japanese
Content preview from 図解まるわかり 仮想化のしくみ
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前節で説明したように、VLANは、物理的なネットワークを論理的に
分割する技術です。複数のネットワークを1 つの物理的なネットワーク上
で分割することで、セキュリティの向上やネットワークの効率化が可能に
なります。
VLANは、スイッチやルータなどのネットワーク機器を利用して実現し
ます。スイッチには、ポートごとにVLANを設定できます。同じVLANに
属するポート同士は、物理的に接続されていなくても同じネットワーク上
にあるとみなされます。また、ルータを利用して異なるVLAN同士を接続
できます。
異なるセグメント同士で通信を行う場合、通信が不要なポートにも通信
が流れるため、ネットワークの効率が低下することがありますが、VLAN
を利用することで、不要なポートに通信が流れることを防ぎ、ネットワー
クの効率を向上させることができます（図3-3）。
ポートVLANとタグVLAN
VLANにはポート VLAN とタグ VLAN があります（図 3-4）。
ポートVLANは、スイッチのポートごとにVLANを設定する方法です。
ポートごとにVLANを設定することで、同じVLANに属するデバイス同士
で通信を行えます。ポートVLANは、スイッチのポートごとにVLANを設
定するため管理が容易であり、設定が簡単です。しかし、異なるVLAN同
士の通信を行う場合、ルータを介して通信を行う必要があります。
タグVLANでは、VLAN IDを付加したタグをパケットに付与することで、
異なるVLAN同士の通信を行えます。タグ ...
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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.