EBK COMPUTER NETWORKING
EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Chapter 2, Problem P20P

Suppose you can access the caches in the local DNS servers of your department. Can you propose a way to roughly determine the Web servers (outside your department) that are most popular among the users in your department? Explain.

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Sort DNS records according to their kind. Give a short description of each with examples, as well as an explanation of why they are utilized. Is it feasible for a web server and a mail server in an organization to use the same alias for a hostname?
A person's e-mail address is his or her login name @ the name of a DNS domain with an MX record. Login names can be first names, last names, initials, and all kinds of other names. Suppose that a large company decided too much e-mail was getting lost because people did not know the login name of the recipient. Is there a way for them to fix this problem without changing DNS? If so, give a proposal and explain how it works. If not, explain why it is impossible.
For DNS query, it is natural to expect that the local DNS server may not know how to resolve an address. In this case, further queries will be made by this local DNS server. If a hacker can find "a way" to make a certain DNS server report back the wrong IP address, then anyone trying to get to one Web address will be sent to a bogus one, without any obvious way for the user to detect that anything is wrong. Likewise, email could be delivered to the wrong destination. 1) Describe two possible attacks to make the resolver report the wrong IP address.

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