フリー問題

問題文

A carrier runs more than one instance of the link-state protocol, and each instance may carry several topologies. Some of its circuits join exactly two systems while others are shared segments. An engineer has to record which topologies the update process runs for on a circuit that joins two systems, and how the election of the one representative per instance on a shared segment relates to the topologies the hellos carry. Which statement is correct?

選択肢

1. On a direct circuit the process runs only for topologies supported on either of the ends, and on a shared circuit the election for each instance reflects the topologies advertised.
2. On a direct circuit the process runs only for topologies supported on either of the ends, and on a shared circuit the election for each instance ignores the topologies advertised.
3. On a direct circuit the process runs only for topologies supported on both of the ends, and on a shared circuit the election for each instance ignores the topologies advertised.
4. On a direct circuit the process runs only for topologies supported on both of the ends, and on a shared circuit the election for each instance reflects the topologies advertised.