Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] [Z] half-duplex dialog mode hands-on experience (Network+ self assessments) 2nd hard disks boot sector viruses fault tolerance RAID 0 RAID 1 2nd RAID 10 RAID 5 2nd RAID comparison list 2nd 3rd hardware loopback connectors 2nd HDSL (High Bit Rate DSL) 2nd heartbeats help facility (diagnostic utilities), accessing HFS+ (Hierarchical File Systems+) high-density devices history (passwords) hoaxes (viruses) viruses worms; spyware [See also trojan horses] hostnames DNS (Domain Name Service) protocol 2nd 3rd HOSTS files 2nd hot recovery sites 2nd hot spares hot swapping hotspots 2nd 3rd HTTP (Hypertext Transfer Protocol) URL (uniform resource loacator) HTTP proxies [See proxy servers] HTTP proxy servers [See proxy servers] HTTPS (Hypertext Transfer Protocol Secure) SSL (Secure Sockets Layer) hubs 2nd active hubs crossover cables 2nd high-density devices MDI (Medium Dependant Interface) ports MDI-X (Medium Dependant Interface-Crossed) ports OSI (Open Systems Interconnect) reference model maps passive hubs troubleshooting 2nd versus switches workgroup hubs |