H

hashing algorithms, 238-239 MD5, 239-240 SHA, 239-240 HDLC, (High Level Data Link Control) 80 Hello packets EIGRP, 63 OSPF, 67 HELO command (SMTP), 127 help command (DOS), 284 hiding secret passwords, 181 hijacking, 369 holdtime, 63 host IDSs, 372

hosts per subnet, calculating, 37-38 HSRP (Hot Standby Routing Protocol), 47 configuring, 50-51 enabling, 49 HTTP (Hypertext Transfer Protocol), 118 defining port number, 120 security, SSL, 121 user authentication, 119

hybrid routing protocols, EIGRP, 62-63 configuration example, 64-66

IBGP (internal BGP), 78

ICMP (Internet Control Message Protocol), 52-53 IDSs (intrusion detection systems), 372 Cisco IDS

Signature Engines, 373-374 supported products, 373 NetRanger, 300 Director, 302 sensors, 300

supporting platforms, 301 typical network placement, 300 IETF (Internet Engineering Task Force)

website, 368 ifconfig command (UNIX), 287 IKE (InternetKey Exchange), 246 configuring, 252-259 phase I, 247 phase II, 248-252 incident response teams, 367 inform requests (SNMP), 122 Initial configuration mode (IOS), 157 inside global addresses, 324 inside local addresses, 324 instances, 227

Interface configuration mode (IOS), 157 interfaces, 156

access lists, applying, 185-187 Ethernet states, 165 Internet Domain Survey website, 368 Internet newsgroups, 368 InterNic, 325

intruders, methods of attack, 369

IOS images, copying from TFTP servers, 114

IP addressing, 33

address classes, 36 ARP, 45-46 CIDR, 39

classful addressing, 40 DHCP, 47 DNS, 110-111

enabling lookup on Cisco routers, 112 logical AND operation, 37 name resolution on Windows NT systems, 292 packets, 34-35 RARP, 46 subnetting 36

calculating hosts per subnet, 37-38 VLSM, 38-39 IP GRE (generic routing encapsulation) tunnels configuring, 349-351 ip helper-address command, 292 ip host command, 110 ip http authentication command, 119 IP multicast, 83 IP packet debugging, 171-172 ip route-cache command, 168 ip subnet-zero command, 38 ipconfig command, 295-296 IPSec, 242

AH, 244-246 ESP, 243-244 ISDN (Integrated Services Digital Network), 79 commands, 82 framing, 80 layer 2 protocols, 80 authentication, 82 HDCL, 80 LCP, 82 NCP, 82 PPP, 81 ISL (Inter-Switch Link), 33 ISO (Organization for Standardization), 21 ISOC (Internet Society) website, 368

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