[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] UC Davis Web site unclassified data handling 2nd unencrypted authentication FTP server vulnerability uninterruptible power supply (UPS) Usenet (NNTP) servers user accounts privileges auditing 2nd user education exam practice questions implementing 2nd 3rd methods 2nd user-based access control model UTP ( unshielded twisted-pair) cable Cat3 type Cat5 type interference |