What is the relationship between a domain name (e.g., cs.princeton.edu) and an IP subnet number (e.g., 192.12.69.0)?
Question:
What is the relationship between a domain name (e.g., cs.princeton.edu) and an IP subnet number (e.g., 192.12.69.0)? Do all hosts on the subnet have to be identified by the same name server? What about reverse lookup, as in the previous exercise?
Exercise 3
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 address is 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.
Whose DNS servers would you be trusting?
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The relationship between a domain name like csprincetonedu and an IP subnet number like 19212690 is that the domain name can be resolved to a specific ...View the full answer
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Related Book For 
Computer Networks A Systems Approach
ISBN: 9780128182000
6th Edition
Authors: Larry L. Peterson, Bruce S. Davie
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