31 Days Before Your CCNA Exam

flow control, TCP/IP 387EIGRP routing, configuring, 357, 365-366electrical threats, 271Electronics Industry Alliance (EIA), 36eliminating routing loops, 155-156employees, wireless security risks, 257enable password command, 55enable password password command, 169enable secret command, 55encapsulating protocols, 323Encapsulating Security Payload (ESP), 325encapsulation, 322HDLC, 329-330OSI models, 16encapsulation ppp command, 334encapsulation process, 16encoding channels, wireless encodingchannels, 255encryption, 257, 322encryption algorithms, VPNs, 323Enhanced Interior Gateway RoutingProtocol. See EIGRPEnterprirse Architecture, 10Enterprise Branch Architecture, 10Enterprise Campus Architecture, 10Enterprise Data Center Architecture, 10Enterprise Edge Architecture, 10Enterprise Teleworker Architecture, 10environmental threats, 271erase startup-config command, 51erasing configuration files, Cisco IIOS, 51error detection, LCP, 332error recovery, TCP/IP, 24ESP (Encapsulating Security Payload), 325establishing VPN connections, 322authentication, 325encryption algorithms, 323hashes, 324-325IPsec Security Protocols, 325tunneling, 323Ethernet, 16addresses, 38current Ethernet technologies, 36framing, 39Gigabit Ethernet, 37legacy Ethernet technologies, 34-36CSMA/CD, 35overview, 33-34physical layer, role of, 40switches, 37-38UTP cabling, 36-37EtherType field, 74EUI-64 format, IPv6, 141-142examinationsexam day information, 377post-exam informationcareer options, 379-380receiving your certificate, 379retesting, 380examination commands, Cisco IOS, 50exit interface parameter, configuring staticroutes, 193-194extended ACLs, 280extended numbered ACLs,configuring, 284deny FTP from subnets, 285deny only Telnet from subnets, 285-286Extensible Authentication Protocol(EAP), 264Exterior Gateway Protocols (EGP), 150external threats, 271External Type 1 (E1), 240External Type 2 (E2), 240FFC (Feasibility Condition), 223FCC (Federal CommunicationsCommission), 253-254FD (Feasible Distance), 223Feasible Successor (FS), 223FECN (forward explicit congestion notification),Frame Relay, 339FHSS (Frequency Hopping SpreadSpectrum), 255file naming conventions, IOS, 182-183file systems, default file systems, 180File Transfer Protocol (FTP), 15firewall ACLs, configuring, 359, 372-373firewalls, 273flash memory, 162flow control, TCP/IP, 25