Consider the example in Figure 8.28. Suppose Trudy is a woman-in-the middle. Who can insert data-grams into the stream of data-gram going from Rl and R2. As part of a reply attack, Trudy sends a duplicate copy of one of the data-grams sent from R I Lo R2. Will R2 decrypt the duplicate data-gram and forward it into the branch-office network? If not, describe in detail how R2 detects the duplicate data-gram.

Figure 8.28

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Headquarters Branch Office Internet 193.68.2.23 200.168.1.100 SA R2 R1 172.16.1/24 172.16.2/24