In a corporate network, a network administrator is tasked with establishing a theory to improve the overall performance and security of the network. The administrator considers implementing a Virtual Local Area Network (VLAN) to segment traffic based on department needs. Given that the company has three departments: Sales, HR, and IT, each department generates different amounts of traffic. The Sales department generates 60% of the total network traffic, HR generates 20%, and IT generates 20%. If the total network traffic is measured at 1000 Mbps, what would be the ideal bandwidth allocation for each department to optimize performance while maintaining security?