問62
頻出度★★★
アドホックネットワークの説明として, 適切なものはどれか。
令和4年度 ITパスポート試験 問62
テクノロジ系ネットワーク › ネットワーク方式
This question's explanation and your answers so far.
解説
問 62
- ア
正解 An ad hoc network is a wireless network in which terminals communicate directly with each other on an equal footing, without going through an access point (base station). A key characteristic is that terminals can connect autonomously when needed to form a temporary network. Among the communication modes of a wireless LAN, in contrast to infrastructure mode (which goes through an access point), this mode is called ad hoc mode. Choice ア, “a wireless network in which terminals communicate directly with each other without going through an access point”, is exactly this definition, so it is the correct answer.
Incorrectイ
“A network that provides a secure, private environment over the Internet” describes a VPN (Virtual Private Network), which creates a virtual dedicated line over public lines using techniques such as encryption. It is not an ad hoc network.
Incorrectウ
“A wired network that connects a server with multiple PCs that use that server” describes a client-server LAN configuration. An ad hoc network is wireless, peer-to-peer communication that does not go through a server, so it is completely different in being wired and server-centered.
Incorrectエ
“A wide area network that connects geographically distant sites such as a head office and branch offices” describes a WAN (Wide Area Network). An ad hoc network is a wireless network temporarily formed by nearby terminals, so it differs from a wide area network connecting sites in both coverage and purpose.
ここがポイント
- Ad hoc network = a wireless network in which terminals communicate directly without going through an access point (the ad hoc mode of a wireless LAN). Remember it in contrast to infrastructure mode, which goes through an access point.
- Distinguish easily confused network terms: tell apart a VPN (a virtual dedicated line over the Internet), a client-server LAN, a WAN (a wide area network connecting sites), and an ad hoc network by their respective definitions.
用語