noun
A diagnostic test in computing where a signal is sent and returned to the same device to verify the communication path.
ネットワークのトラブルを調べるために、折り返し試験を実施した。
We performed a loopback test to investigate the network trouble.
Compound of 折り返し (loopback, return) and 試験 (test). The exact derivation is straightforward from its components.