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

{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
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{Will all forward queries for domains be issued to a root server?} - Yes + No
 * caching of DNS entries prevents this

{What is a problem that occurs when ISPs cache address resolution answers} - There is no problem + The cache might get outdated + Inconsistency might arise - DNS stops to be a hierarchical protocol - Caching and spreading results is prohibited in some countries due to copy right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