T

TACACS+ (Terminal Access Controller Access Control System Plus), 218 authentication, 219 authorization, 219-220 configuring, 220-223 features, 220 versus RADIUS, 224-225 TCP (Transmission Control Protocol), 40 ARP, 45-46 DHCP, 47 FTP, 53

header format, 41 HSRP, 47

configuring, 50-51 enabling, 49 ICMP, 52-53 load distribution, 328 packets, 41-42 RARP, 46

services, filtering, 322, 324 Telnet, 53

Telnet requests, 42, 45 three-way handshakes, 44 TFTP, 53 TCP half close, 44 TCP intercept, enabling, 379 TCP SYN Flood attacks, 371 TCP/IP (Transmission Control Protocol/Internet Protocol) FTP protocol

Active mode, 115-117 Passive mode, 117-118 vulnerabilities, 369-370 TCP/IP model versus OSI reference model, 25 teardrop attacks, 371

Telnet, 53

connections, establishing, 179 disabling login password, 113 requests, 42, 45 test characters (ping), 52-53 TFTP (Trivial File Transport Protocol), 53, 113

defining download directory, 114 TGT (Ticket Granting Ticket), 228 time sources (NTP)

configuring, 130-131 stratum, 128-129 timestamps, 226 topology table (EIGRP), 63 totally stubby areas, 70 traceroute command (UNIX), 285 tracert command (DOS), 285 transform sets (IKE), defining, 253 transparent bridging, 30 transport layer (OSI model), 24 Transport mode (IPSec), 242 trap command (SNMP), 123 traps (SNMP), 122 triggered updates, 59 trunks, 31

trusted domains, 292 trusting domains, 294 Tunnel mode (IPSec), 242 tunneling

IP GRE, 349-351 VPDNs, 229-231

configuring, 231-235 turning off debugging, 163

0 0

Post a comment