問題文
The trunk page in Control Hub shows one of the trunks as impaired. What does that word stand for, and how often is the reading refreshed without anyone asking for it?
選択肢
- Every one of the edge proxies has failed to connect, which is the same reading a trunk shows while it is still being added, and the status is brought up to date once an hour.
- At least one of the edge proxies has been unable to reach the local gateway, and the reading is refreshed on its own every three minutes.
- The trunk is carrying calls but the local gateway has told the edge proxies of a shortage of capacity, and the status is brought up to date each time the page is opened by hand.
- The local gateway has answered but the credential it presented could not be checked against the trust list, and the status is brought up to date every ten minutes for as long as the trunk stays in that state.