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DATA command (SMTP), 128 data encryption 3DES, 238 DES, 237-238 Diffie-Hellman, 240-241 DSS, 238-239 IPSec, 242

AH, 244-246 ESP, 243-244 MD5, 239-240 principles of, 235-237 data link layer (OSI model), 22 data manipulation, 369

DDOS (Distributed Denial Of Service) attacks, 371 debug all command, 171 debug commands, 168-174 options, 169-170

debugging, turning off, 163 default services, disabling, 378 defining

HTTP port number, 120 IP address names, 110 TFTP download directory, 114 del/erase command (DOS), 284 deploying NAT, 325

DES (Data Encryption Standard), 237-238 development of Ethernet, 27 of OSI reference model, 21 development of UNIX operating system, 284 devices asynchronous communication, 84-85 broadcast domains, 30 broadcasting, 292 firewalls, 320 VLANs, creating, 30 Df command (UNIX), 284 DHCP (Dynamic Host Configuration Protocol), 47, 292

disabling, 377 Diffie-Hellman protocol, 240-241 dir command (DOS), 284 directories, 289 directories (UNIX), 289-290 disabled state (spanning tree), 31 disabling default services, 378 DHCP, 377

DNS lookup on Cisco routers, 112 TCP/UDP small servers, 376 Telnet login password, 113 displaying configured policy routes, 166 router home page, 118 routing tables, 55-56 system log, 166

distance vector protocols loop avoidance techniques, 59 RIP,57-59

configuring, 59-61 DLCIs (data-link connection identifiers), 83 DMZ (demilitarized zone), 320 DNS (Domain Naming System), 110-111 disabling lookup on Cisco routers, 112 enabling lookup on Cisco routers, 112 DNS poisoning, 371 domains, 290

trust relationships, 294 trusted domains, 292 domains (Windows NT), scalability, 292 DOS commands attrib, 285

correlated UNIX commands, 284-285 ipconfig, 295-296 route, 296

DoS (Denial of Service) attacks, 370-372 DRs (Designated Router), 68

election process, disabling, 75 DSS (Data Signature Standard), 238-239, 348 dynamic crypto map entries, 254 Dynamic NAT, configuring, 326-327

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