Web Science/Part1: Foundations of the web/Domain Name System/DNS address resolution

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DNS address resolution

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Video

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Quiz

1

What is the difference between a forward and a reverse lookup

The used transport layer protocol is different
Forward lookups turn domain names to ip addresses
Forward lookups turn ip addresses to domain names
Reverse lookups turn ip addresses to domain names
Reverse lookups turn domain names to ip addresses

2

Will all forward queries for domains be issued to a root server?

Yes
No

3

What is a problem that occurs when ISPs cache address resolution answers

There is no problem
The cache might get outdated
Inconsistency might arise
DNS stops to be a hierarchical protocol
Caching and spreading results is prohibited in some countries due to copy right violations

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Further reading

  1. An example of theoretical DNS recursion.svg
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Discussion