フリー問題

問題文

A unit that takes traffic apart by tag has to receive and forward tagged frames. Which statement binds one tag and which binds a pair of stacked tags, and what does the physical port underneath have to carry?

選択肢

1. The statement that names one identifier binds stacked tags while the statement that names a pair of them binds a single tag with a protocol identifier beside it, and the physical port needs to carry, in writing of its own, the statement for single tagging or the one for stacked tagging, that being enough to match
2. The statement that names one identifier binds stacked tags while the statement that names a pair of them binds a single tag with a protocol identifier beside it, and the physical port needs no statement of its own for the purpose, the writing that stands on the unit being enough on its own
3. The statement that names one identifier binds a single tag while the statement that names a pair of them binds stacked tags, and the physical port needs to carry, in writing of its own, the statement for single tagging or the one for stacked tagging, that being enough to match
4. The statement that names one identifier binds a single tag while the statement that names a pair of them binds stacked tags, and the physical port needs no statement of its own for the purpose, the writing that stands on the unit being enough on its own