 Quality of Service (QoS) policies can be used to prioritize network traffic, with traffic shaping available to all applications, even those that do not explicitly use QoS APIs.Windows Vista includes in-built support for peer-to-peer networks and SMB 2.0.For improved network security, Windows Vista supports for 256-bit and 384-bit Diffie-Hellman (DH) algorithms, as well as for 128-bit, 192-bit and 256-bit Advanced Encryption Standard (AES) is included in the network stack itself, while integrating IPsec with Windows Firewall.