フリー問題

問題文

In an emulated LAN the wires form a full web between the edge devices, and the customer still runs its own bridge protocol behind them. Which statement about whose duty it is to build a loop free shape, about what an edge device does with a frame that arrived over one wire of the web, and about the fate of the bridge control frames of the client site is correct?

選択肢

1. In that emulated network the duty of building a loop free shape falls to the provider, an edge device that received a frame over one wire of the web passes it along to other wires, and the bridge control frames of the client site disappear inside the cloud, as the specification lays out.
2. In that emulated network the duty of building a loop free shape falls to the sender, an edge device that received a frame over one wire of the web passes it along to other wires, and the bridge control frames of the client site ride through the cloud, as the specification lays out.
3. In that emulated network the duty of building a loop free shape falls to the sender, an edge device that received a frame over one wire of the web keeps it clear of other wires, and the bridge control frames of the client site disappear inside the cloud, as the specification lays out.
4. In that emulated network the duty of building a loop free shape falls to the provider, an edge device that received a frame over one wire of the web keeps it clear of other wires, and the bridge control frames of the client site ride through the cloud, as the specification lays out.