問71
頻出度★★★
インターネットで使用されているドメイン名の説明として, 適切なものはどれか。
令和6年度 ITパスポート試験 問71
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 71
Incorrectア
The description “the name of a communication protocol used by applications for Web browsing or sending and receiving email” explains a protocol (a communication convention) such as HTTP or SMTP, not a domain name.
- イ
正解 A domain name is a human-readable string name assigned to identify a computer or network on the Internet (for example, “example.co.jp”). It is used to represent, with an easy-to-remember name, a device that is originally identified by a numeric value called an IP address, and DNS maps domain names and IP addresses to each other. Therefore choice イ, which describes it as “a name used to identify a computer, a network, or the like,” is the correct description.
Incorrectウ
The description “a name used to identify an application that performs communication” is closer to the role of a port number, which identifies the application (service) of the communication partner; it is not a description of a domain name.
Incorrectエ
The description “the name of the recipient specified as the destination of an email” explains an email address. A domain name is used in the part after the “@” in an email address, but it is not a name that represents the recipient (the other party) itself.
ここがポイント
- Domain name = a name that identifies computers and networks on the Internet using a human-friendly string. It is mapped to an IP address by DNS.
- Distinguish by what is being identified: computer/network → domain name, IP address; application (service) → port number; communication convention → protocol.
用語