V

versions of SNMP, 121 viewing configuration register, 155 DHCP leases, 47 home pages, 118 interfaces, 156 routing tables, 55-56 startup config, 178 virtual links, 71

virtual terminal passwords, setting, 182 VLANs (virtual LANs), creating, 30 VLSM (variable-length subnet masking), 38-39 VPDNs (Virtual Private Dial-up Networks), 229-231

configuring, 231-235 VPNs (virtual private networks), 349

configuring, 350-351 VRFY command (SMTP), 128 vulnerabilities of network systems, investigating with

NetSonar, 302-304 of TCP/IP, 369-370

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