フリー問題

問題文

A decoder is being written for the route that carries a station address and sometimes a network address as well, and the two length fields ahead of them are read in different units. Which option is correct about the length field ahead of the station address, about the length field ahead of the network address, and about the state a router keeps for a distant address?

選択肢

1. About that route the length field ahead of the station address counts in bits and reads forty eight, the length field ahead of the network address reads fifteen by default, and the state a router keeps for a distant address leaves the timing to the remote build, as the specification lays out.
2. About that route the length field ahead of the station address counts in bits and reads forty eight, the length field ahead of the network address reads zero by default, and the state a router keeps for a distant address leaves the timing to the local build, as the specification lays out.
3. About that route the length field ahead of the station address counts in bits and reads sixty eight, the length field ahead of the network address reads fifteen by default, and the state a router keeps for a distant address leaves the timing to the local build, as the specification lays out.
4. About that route the length field ahead of the station address counts in bits and reads sixty eight, the length field ahead of the network address reads zero by default, and the state a router keeps for a distant address leaves the timing to the remote build, as the specification lays out.