問61
頻出度★★★
ネットワークに関する次の記述中のa～cに入れる字句の適切な組合せはどれか。 建物内などに設置される比較的狭いエリアのネットワークを a といい，地理的に離れた地点に設置されている a 間を結ぶネットワークを b という。一般に， a に接続する機器に設定する IP アドレスには，組織内などに閉じたネットワークであれば自由に使うことができる c が使われる。
平成31年度 春期 ITパスポート試験 問61
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 61
Incorrectア
The correspondence a=LAN, b=WAN is correct, but c, “global IP address,” is wrong. A global IP address must be unique across the entire internet and must be assigned by an ISP or the like, so it contradicts the description that it “can be used freely within an organization.”
- イ
正解 The correct answer is “イ” (a=LAN, b=WAN, c=private IP address). Blank a is “a network covering a relatively small area, such as one set up within a building,” so LAN (Local Area Network), which denotes a local network, fits. Blank b is “a network that connects together LANs at geographically distant locations,” so WAN (Wide Area Network), which denotes a wide-area network, fits. Blank c is “an IP address that can be used freely in a network closed within an organization,” so a private IP address fits. A private IP address is not required to be unique on the internet and may be assigned freely within an organization, so it matches the description.
Incorrectウ
a and b are swapped: the network covering a small area is labeled WAN and the network connecting distant locations is labeled LAN, so the definitions of LAN and WAN are interchanged. In addition, c, “global IP address,” also contradicts the description that it “can be used freely,” so this option is wrong.
Incorrectエ
c, “private IP address,” is correct, but a and b are swapped: the network covering a small area is labeled WAN and the network connecting distant locations is labeled LAN, so the definitions of LAN and WAN are interchanged, making this option wrong.
ここがポイント
- The distinction in definitions: a LAN (Local Area Network) is a local network covering a small area such as within a building, while a WAN (Wide Area Network) is a wide-area network that connects together LANs at geographically distant locations.
- The difference: a private IP address can be used freely in a network closed within an organization, whereas a global IP address requires a unique assignment on the internet.
用語