問67
頻出度★★★
ネットワーク環境で利用される IDS の役割として, 適切なものはどれか。
令和5年度 ITパスポート試験 問67
This question's explanation and your answers so far.
解説
問 67
Incorrectア
Converting between IP addresses and domain names is the role of DNS (Domain Name System), which has nothing to do with an IDS.
Incorrectイ
Synchronizing the clocks of multiple computers on a network is the role of NTP (Network Time Protocol), not a function of an IDS.
- ウ
正解 IDS stands for “Intrusion Detection System”. It is a mechanism that monitors and detects unauthorized access to networks and servers as well as signs of attacks, and notifies the administrator of what it detects. Therefore, choice ウ, which states that it “detects unauthorized access to networks and the like, as well as signs of it, and notifies the administrator”, correctly describes the very role of an IDS, and is the correct answer.
Incorrectエ
Delivering email that has arrived at the mail server to the mail client is the role of receiving protocols such as POP3 and IMAP, and is unrelated to an IDS.
ここがポイント
- An IDS (Intrusion Detection System) is a mechanism that detects unauthorized access and signs of attacks and notifies the administrator. Detection is its main purpose; the one that also blocks such traffic is an IPS (Intrusion Prevention System).
- Distinguishing roles that are easy to confuse: name resolution is handled by DNS, time synchronization by NTP, and email reception by POP3/IMAP—each has its own dedicated mechanism.
用語