問58
頻出度★★★
ハブと呼ばれる集線装置を中心として, 放射状に複数の通信機器を接続する LAN の物理的な接続形態はどれか。
平成30年度 春期 ITパスポート試験 問58
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 58
- ア
正解 The correct answer is ア (Star topology). In a star topology, a hub (concentrator) is placed at the center, and each communication device is connected to that hub by a one-to-one cable in a radial layout. This exactly matches the question’s description of connecting multiple communication devices radially around a central hub. Because communication between devices always passes through and is relayed by the central hub, the wiring forms a radial (star) shape concentrated at the center. It is the most common topology in today’s Ethernet LANs.
Incorrectイ
In a bus topology, each communication device branches off and connects to a single shared backbone cable (the bus). There is no central hub, and the devices line up along one straight cable rather than radiating outward, so it does not match the question’s description.
Incorrectウ
In a mesh topology, communication devices are interconnected in a net-like pattern, with many direct links running between devices. Since they connect to each other as peers without going through a central concentrator, it does not fit the question’s description of a radial layout centered on a hub.
Incorrectエ
In a ring topology, communication devices are connected one after another in a loop (ring), and signals circulate in one direction around the ring. It has no central hub and is connected in a circular ring rather than radially, so it does not match the question’s description.
ここがポイント
- Classification of physical LAN topologies. A star topology connects each device radially around a central hub (concentrator), and communication is relayed through that central hub.
- Distinguishing it from other representative topologies. A bus topology branches off a single backbone cable, a ring topology connects devices in a loop, and a mesh topology interconnects devices in a net-like pattern — none of them assume a central hub.
用語