D

DAI (dynamic ARP inspection), 247

DDoS (distributed denial of service) attacks, 130136

denial of service. See DoS

device discovery, 3243

devices

Asterisk, 325

Avaya, 256257, 264

Cisco. See Cisco devices

countermeasures, 42

DoS attacks on, 139141

Google hacking, 220221, 264

identification of, 4753

public website research, 1117

routers. See routers

switches. See switches

web-based logins, 2022

DHCP (Dynamic Host Configuration Protocol), 142

DHCP exhaustion attacks, 141145

DHCP messages, 142

DHCP servers, 141145, 224

DHCP snooping, 224, 246, 247

DHCP spoofing, 246

dhcpx tool, 142144

DiffServ (differential services), 134135

distributed denial of service (DDoS) attacks, 130136

DNS (Domain Name System), 23

DNS analysis, 2327

DNS Analyzer, 2527

DNS Audit tool, 26

DNS cache poisoning attacks, 145

DNS interrogation attacks, 2327

DNS lookups, 26

DNS servers, 27, 146

Domain Name System. See DNS

DoS (denial of service) attacks, 389428

ACM, 308310

Asterisk, 341342

CCM, 241245

countermeasures, 134136

DDoS attacks, 130136

described, 130

flooding attacks, 130136, 146

infrastructure attacks, 141146

measuring VoIP call quality, 122130

media gateways, 426428

network availability, 136139

overview, 390393

references, 428

against routers, 10

SIP phones attacks, 414427

SIP proxy attacks, 393414

VoIP devices, 139141

dsniff tool, 182183

DTMF Decoder tool, 164

DTMF (dual-tone multifrequency) tones, 149

DTP (Dynamic Trunking Protocol), 247

dual-tone multifrequency. See DTMF

dynamic ARP inspection (DAI), 247

Dynamic Host Configuration Protocol.     See DHCP

Dynamic Trunking Protocol (DTP), 247