Method and Assumptions (2)
worst case assumes no deployment of proxy servers and limited gain from dynamic allocation of IP addresses (DHCP) for DSL
best case assumes extensive proxy server deployment and a separate gain from extensive use of DHCP
most likely case - some proxy server deployment and a separate gain from some deployment of DHCP
DHCP gain from dynamic allocation of addresses is factored in as 1:1 business user and 5:1 residential user