問67
頻出度★★★
PCやサーバ, 通信機器, プリンタなどの間での通信を行う事例のうち, WANを利用する必要があるものはどれか。
平成28年度 春期 ITパスポート試験 問67
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 67
Incorrectア
This is an example in which multiple PCs and a file server are connected and accessed within the LAN of a single site, the Osaka branch office, so the communication is completed within the same premises. No connection to a remote location is needed, so a WAN is not used.
Incorrectイ
This is an example in which a PC and a printer are connected via Bluetooth within a home, so the communication range is limited to a very short distance (equivalent to a PAN). There is no need to link separate sites, so a WAN is not used.
Incorrectウ
This is an example in which a PC and a Web server are connected to a hub within a server room to perform maintenance, so it is completed within a LAN on the same premises. There is no connection to a remote location, so a WAN is not required.
- エ
正解 A WAN (wide area network) connects sites that are geographically far apart, and its role is to link one LAN to another using a telecommunications carrier's lines. Choice エ is an example in which a PC inside the Fukuoka sales office accesses a server inside the Tokyo head office and uploads sales information, connecting the two distant LANs of Fukuoka and Tokyo so they can communicate. Because the communication cannot be completed within a single building or premises, a WAN linking the two sites is required. Therefore the correct answer is エ.
ここがポイント
- Grasp the difference in roles: a LAN is a small-scale network connecting things within the same premises (a building or site), while a WAN is a large-scale network connecting geographically distant sites over a telecommunications carrier's lines.
- Judge whether a LAN or a WAN is needed by asking whether the communication spans different cities or different sites. If it spans separate sites, a WAN is required.
用語