フリー問題

問題文

An operator wants a device to stop putting certain routes it receives from a neighbor into its routing table. Which kind of policy is applied?

選択肢

1. A firewall filter applied to the input of the interface facing the neighbor, so that the advertisements carrying those routes are discarded before the protocol process can read them and add the routes to the table.
2. An export policy, because the routes originate outside the device.
3. A policy applied to the forwarding table.
4. An import policy, because import governs what the protocol places into the routing table from what it receives.