フリー問題

問題文

A reviewer is listing the security notes that the label stack encapsulation inherits from the architecture. Which statement is correct?

選択肢

1. Procedures that lean on the network layer header sitting at a fixed place stop working here because this encapsulation carries a padded size, the meaning of a label rests on an agreement between the label reader and the label writer, and the stack leaves the identity of that party opaque, so labeled packets taken from untrusted sources may be counted in an illegitimate manner.
2. Procedures that lean on the network layer header sitting at a fixed place stop working here because this encapsulation carries a variable size, the meaning of a label rests on an agreement between the label reader and the label writer, and the stack leaves the identity of that party opaque, so labeled packets taken from untrusted sources may be routed in an illegitimate manner.
3. Procedures that lean on the network layer header sitting at a fixed place stop working here because this encapsulation carries a variable size, the meaning of a label rests on an agreement between the label reader and the label originator, and the stack leaves the identity of that party opaque, so labeled packets taken from untrusted sources may be counted in an illegitimate manner.
4. Procedures that lean on the network layer header sitting at a fixed place stop working here because this encapsulation carries a padded size, the meaning of a label rests on an agreement between the label reader and the label originator, and the stack leaves the identity of that party opaque, so labeled packets taken from untrusted sources may be routed in an illegitimate manner.