Question: Question 4 Why is caching DNS query results a good strategy, in spite of the possibility that the cache may have been corrupted by a

Question

4

Why is caching DNS query results a good strategy, in spite of the possibility that the cache may have been corrupted by a malicious outsider? Does it really matter if a DNS query resolves incorrectly? Won

t a user wanting to go to a site such as xyz

.

com readily notice being at uvw.com, instead? Explain your answer.

Question

5

Covert channels are typically not used by insiders, who usually have more effective ways to distribute protected data. Describe how an outsider might use a covert channel to obtain sensitive data. How could steganography be used to protect data? Is it a preventive or detective approach?

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