[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] [Y] [Z] x-token (MIME encoding type) X.25 networks, packet fragmentation X.400 protocol XDR protocol, Presentation Layer xinetd (Extended Internet Daemon) access control xinetd.conf file security considerations xonxoff option (pppd) |