Recently the increasing use of IP networks, their applications and users requires an increasing amount of networking resources. Therefore, organizations require the guarantee of bandwidth transmission for critical applications for network users, i.e., a guaranteed quality of service. In this contribution we present a decision based model for networking that priors the critical data flow in an organization. This model gathers the preferences of different users with different degree of knowledge about the scenario that might use different scales to express them. Such preferences are based on user's perceptions that imply subjectivity and uncertainty hence, the use of fuzzy linguistic information can improve its treatment and to manage multiple linguistic scales we propose the use of linguistic hierarchies. Eventually a real application of the model in an organization is developed.