A queuing policy helps the network manager
meet two major challenges: provide an appropriate level of service
for all users and control expensive WAN costs.
Typically, the corporate goal is to deploy and maintain a single enterprise network, even though the network supports disparate applications, organizations, technologies, and user expectations. Consequently, network managers are concerned about providing all users with an appropriate level of service, while continuing to support mission-critical applications and having the ability to integrate new technologies at the same time.
Because the major cost of running a network is also related to WAN circuit charges, network managers must strike the appropriate balance between the capacity and cost of these WAN circuits, and the level of service provided to the users.
To help meet these challenges, queuing allows network managers to prioritize, reserve, and manage network resources—and to ensure the seamless integration and migration of disparate technologies without unnecessary costs.
If a WAN link is constantly congested, traffic prioritization may not resolve the problem. Adding bandwidth might be the appropriate solution.