フリー問題

問題文

An engineer writes the safety filters that go with a triggered discard mechanism. Which statement is correct?

選択肢

1. The safety filter on the way out should deny prefixes longer than the longest one the operator expects to announce, it should also deny the communities used to trigger the filtering as a further safety measure in case the marker that keeps a route inside the network goes unheeded, and extreme caution is wanted when filtering on shorter prefixes so as to avoid collateral damage to other hosts that live inside those blocks.
2. The safety filter on the way out should deny prefixes wider than the longest one the operator expects to announce, it should also deny the communities used to trigger the filtering as a further safety measure in case the marker that keeps a route inside the network goes unheeded, and extreme caution is wanted when filtering on shorter prefixes so as to avoid reputational damage to other hosts that live inside those blocks.
3. The safety filter on the way out should deny prefixes longer than the longest one the operator expects to announce, it should also deny the peers used to trigger the filtering as a further safety measure in case the marker that keeps a route inside the network goes unheeded, and extreme caution is wanted when filtering on shorter prefixes so as to avoid reputational damage to other hosts that live inside those blocks.
4. The safety filter on the way out should deny prefixes wider than the longest one the operator expects to announce, it should also deny the peers used to trigger the filtering as a further safety measure in case the marker that keeps a route inside the network goes unheeded, and extreme caution is wanted when filtering on shorter prefixes so as to avoid collateral damage to other hosts that live inside those blocks.