問題文
Two observations are handed to a hunter. One is a distinctive value in the field that names the sending program in a message header. The other is a value written under a settings key that one family of programs is known to create. Which side of the hierarchy does each sit on?
選択肢
- Both are traces on the wire, since a value that a product can match upon is held to arise in the traffic wherever it happens to be read.
- The first is a trace on the wire and the second is a trace on the machine, since the one arises in the traffic and the other arises in the store that the machine keeps.
- Both are traces on the machine, since a value that appears in a header has to be written by a program that runs upon the machine.
- The first is a trace on the machine and the second is a trace on the wire, since the header was written by the machine and the settings key was read across the network by the products.