問79
頻出度★★★
次の記述a～cのうち, VPNの特徴として, 適切なものだけを全て挙げたものはどれか。 a アクセスポイントを経由しないで, 端末同士が相互に無線通信を行うことができる。 b 公衆ネットワークなどを利用するが, あたかも自社専用ネットワークのように使うことができる。 c ネットワークに接続することによって, PCのセキュリティ状態を検査することができる。
平成31年度 春期 ITパスポート試験 問79
This question's explanation and your answers so far.
解説
問 79
Incorrectア
Statement a alone. Statement a describes “terminals communicating wirelessly with each other directly, without going through an access point,” i.e., the ad hoc mode of a wireless LAN, which is not a characteristic of a VPN. A VPN uses a public network as if it were a dedicated network, so this choice is wrong.
Incorrectイ
Statements a and c. Statement a is the ad hoc mode, and statement c describes a quarantine network that inspects a PC's security status when it connects to the network; neither is a characteristic of a VPN. Because it does not include statement b, which does correspond to a VPN, this choice is wrong.
- ウ
正解 A VPN (Virtual Private Network) is a technology that builds an encrypted “tunnel” over a public network such as the Internet, allowing secure communication as if over the company's own closed, dedicated network. Only statement b matches this definition, so choice “ウ”, which lists only b, is correct.
Incorrectエ
Statement c alone. Statement c describes “inspecting a PC's security status upon connection,” i.e., the function of a quarantine (quarantine network), which is not a characteristic of a VPN, so this choice is wrong.
ここがポイント
- A VPN is a technology that builds an encrypted tunnel over a public network to communicate securely as if over a dedicated line (statement b matches).
- Distinguishing the confusing options: direct terminal-to-terminal communication without an access point = the ad hoc mode of a wireless LAN (a); inspecting a PC's security status upon connection = a quarantine network (c). Neither is a VPN.
用語