Telecommunication networks for transmitting data formerly used numerous different protocols. Owing to the triumph of the internet, the internet protocol (IP) has gained widespread acceptance as standard protocol for data transmission. Nowadays, virtually all data networks are IP-based. The data in these networks are divided up into individual data packets and tagged with the destination and source addresses. At the network nodes, the destination addresses are evaluated by so-called routers, and the data packets are sent to the next node along the route to the destination address. In principle, the individual packets can find differing routes through the network and reach their destination at different times. The destination system puts them back in the correct order if necessary.