Carriers face an interesting dichotomy.
Video entertainment and conferencing services are also predicted to grow substantially. In recent months this traffic dichotomy has lead to the development of IP networks that go beyond best-effort service by adding QoS components. If these new elements can successfully address the new QoS needs, they will add several layers of complexity to the design and sizing of IP networks. Faced with these challenges, ISPs and other service providers increasingly need sophisticated off-line analysis tools to manage their networks. In reality such data is hard to derive because it requires detailed network monitoring, which is either too expensive or affects network performance because of monitoring packet overhead.