To a router, a flow is a 1._____ of packets that share the same characterstics, such as traveling the same 2._____ , using the same 3._____ , having the same kind of security, and so on. A router that suppors the handling of flow labels has a 4._____ table. The table has an entry for each active flow label; each entry defines the 5.______ required by the corresponding flow label.