フリー問題

問題文

A read-based benchmark fails to start between two nodes even though a write-based one works. Which explanation is correct?

選択肢

1. The read operation is available only in the reliable connected mode, so a connection set up in another mode cannot use it.
2. The read operation requires the topology file to have been supplied, and the tool resolves the far side by name before it opens the connection for reading.
3. The read operation requires the buffers on the far side to have been registered with write permission as well as read permission, which the write-based benchmark does implicitly and the read-based one does not, so the operator has to supply an additional argument for the registration to include both.
4. The read operation is not supported by the fabric management entity, which has to authorize each operation type before it can be used, and it declines the request until then.