31 Days Before Your CCNA Exam

382 applications, network-based applicationsapplications, network-basedapplications, 17impact of voice and video, 18increased network usage, 17QoS (quality of service), 17ARP (Address Resolution Protocol), 16,124-126, 148Frame Relay, 339AS (autonomous system), 150assigning VLANs, 358, 369-370to interfaces, 89asymmetric switching, 46ATM, packet-switched connections(WAN), 317attacker terminology, 267-268attackers, thinking like, 268-269authenticationPPP, LCP, 333VPNs, 325wireless security, 257Authentication Header (AH), 325auto-cost reference-bandwidth, 236automatic summarizationEIGRP, 216-217RIPv1, 204-205autonomous system (AS), 150autosummarization, disabling inRIPv2, 208availability, balancing with security, 269Bbacking up IOS images, 184backup DR (BDR), 230backward explicitly congestion notification(BECN), Frame Relay, 339balancing security and availability, 269bandwidth command, 220, 236Basic Rate Interface (BRI), 315basic router configuration, 167-174BDR (backup designated router), 230BECN (backward explicit congestionnotification), Frame Relay, 339BID (bridge ID), configuring, 82-84binary values, subnet masks, 112black hats, 268black hole VLAN, 73boot system command, 186bootup process, routers, 162-163BRI (Basic Rate Interface), 315broadband wireless, Internet connections(WAN), 319broadcast addresses, 38subnetting, 114broadcast domains, 45broadcast storms, STP, 78broadcasts, 43Ccable modems, Internet connections(WAN), 318cablescrossover cables, 6, 164-165straight-through cables, 6, 165calculating Dijkstra algorithm (link-staterouting protocols), 157-158carrier protocols, 323CDP, troubleshooting tools, 68-69central office (CO), WAN, 309channel service unit (CSU), 310CHAP, configuring PPP, 335, 356, 362cHDLC (Cisco HDLC), 329CIR (committed information rate),Frame Relay, 339circuit-switched connections, WAN, 314analog dialup, 314-315ISDN, 315-316Cisco devices, configuring, 47Cisco Enterprise Architecture, 10Cisco HDLC (cHDLC), 329Cisco Interim Solution, 258Cisco IOS (Internetwork OperatingSystem), 46. See also IOSCLI EXEC sessions, 47CLI navigation and shortcuts, 48command history, 49-50connecting to Cisco devices, 46-47examination commands, 50file naming conventions, 182-183help facility, 48storing and erasing configuration files, 51subconfiguration modes, 50