Network Perimeter Security: Building Defense In-Depth

Unshielded twisted pair (UTP) cable, 60

URG bit, 104, 214

Urgent Pointer, 104

U.S. Department of Defense (DoD), 13, 57

User-centric trust model, 176–177

User Datagram Protocol (UDP), 112–114

connectionless nature, 192–193

lack of flow control, 108, 113

packet filtering limitations, 223–224

vulnerabilities, 108, 14