平成31年度春期 ITパスポート試験問57

This question's explanation and your answers so far.

問57

頻出度★★★

DNS の機能に関する記述のうち, 適切なものはどれか。

出典　平成31年度春期 ITパスポート試験問57

解説

問 57

Incorrectア
Mapping IP addresses to MAC addresses is the role of ARP (Address Resolution Protocol), not a function of DNS.
イ
正解 DNS (Domain Name System) is a mechanism that maps human-friendly domain names (for example, “example.co.jp”) to the IP addresses actually used in communication. When a user specifies a domain name, DNS returns the corresponding IP address (name resolution), and communication is then carried out to that IP address. Therefore choice イ, which states that it maps IP addresses to domain names, is appropriate.
Incorrectウ
Using IP addresses to select the path for packet forwarding is the routing (path control) function performed by a router, not a function of DNS.
Incorrectエ
Converting between analog and digital signals is a function of devices such as a modem, and is unrelated to DNS.

ここがポイント

DNS is a name-resolution mechanism that maps domain names and IP addresses to each other.
Learn to distinguish the role of DNS from similar terms (ARP = IP↔MAC, routing = path selection, modem = signal conversion).

用語

解答問57イ