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DNS servers also allow reverse lookup; given an IP address 128.112.169.4, it is reversed into a text string 4.169.112.128.in-addr.arpa and looked up using DNS PTR records (which form a hierarchy of domains analogous to that for the address domain hierarchy). Suppose you want to authenticate the sender of a packet based on its host name and are confident that the source IP addressis genuine. Explain the insecurity in converting the source address to a name as above and then comparing this name to a given list of trusted hosts. Hint: Whose DNS servers would you be trusting?

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