フリー問題

問題文

A Local Gateway is given service records inside its own configuration so that calls can reach several Unified CM hosts. What does the guide say those local records save the operator from doing, and what else has to be written alongside them?

選択肢

1. They save resolving the host names at all, since the records carry each address directly, and a static route has to be written locally so that the replies arrive on the bound interface.
2. They save writing a session target on each of the dial peers, and a pool of ports has to be reserved locally as well so that one host can be reached on more than one of them.
3. They save putting the records into the external name service at all, and address records have to be written locally as well so that every target host name carried in the service records can be resolved.
4. They save numbering the hosts in the order that they should be tried, and a keepalive has to be written locally as well so that a host which has gone quiet is passed over.