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 DNS 
 
Translation between hostnames and IP addresses is the main task of DNS. See how this works!
 
 SIP 
 
Establishing voice calls over the internet and more ...
 
 multimedia 
 
VoIP, Video on Demand and other multimedia applications over the Internet!
 
 video in internet 
 
Discover how different parameters influence the quality of the video and audio transmission and presentation.
 
 security 
 
This is about internet security - including firewalls, VPN, NAT, ...