Currently companies of all sizes are starting to do e-business via the Inte
rnet, In addition, residential customers are increasingly using the Web for
job purposes, on-line shopping and entertainment. Therefore, network opera
tors and Internet service providers are transforming the Internet into a br
oadband platform for high-speed applications. For ensuring that IP-based ne
tworks can meet new requirements like quality of service or real-time capab
ility, directory-enabled networks, policy-based networks and service-level
agreements are the primary technical concepts that can be applied.