問84
頻出度★★★
インターネットにサーバを接続するときに設定する IP アドレスに関する記述のうち, 適切なものはどれか。ここで, 設定する IP アドレスはグローバル IP アドレスである。
平成29年度 秋期 ITパスポート試験 問84
テクノロジ系ネットワーク › ネットワーク応用
This question's explanation and your answers so far.
解説
問 84
Incorrectア
An IP address can be changed and reconfigured at any time even after it has been set. It can be reset in response to changes in network configuration or server replacement, so the claim that it cannot be changed once set is wrong.
Incorrectイ
A global IP address is a resource managed uniquely worldwide, and it must be assigned by an ISP or an address management organization (registry) before use. The claim that it can be freely set and used without permission as long as it is not used elsewhere is wrong; you cannot pick and use one on your own.
Incorrectウ
If the same global IP address is set on two servers at the same time, an IP address conflict (duplication) occurs and communication cannot be carried out correctly. Two servers cannot be used simultaneously with the same address, so this is wrong.
- エ
正解 A global IP address is assigned to the user (organization) that obtained it, and it is not permanently fixed to one specific server machine. Therefore, if a server breaks down and can no longer be used, the IP address that was set on that server can be reconfigured on a newly purchased server and used continuously. This is choice エ, which is the correct statement.
ここがポイント
- A global IP address is a globally unique resource that is used after being assigned by an ISP or registry (you cannot pick one on your own, and duplication is prohibited).
- An IP address is not permanently fixed to a machine but is assigned to the user, so when a failure occurs it can be reconfigured on another server and used continuously.
用語