background image
800
hostname command, 36, 289
hostnames, mapping to IP addresses, 288­289
hosts
communication between, 82­83
subnets, calculating given a network number
and static subnet mask, 265­267
hubs (Ethernet), 135
full-duplex 10BaseT Ethernet, 137
half-duplex 10BaseT Ethernet, 135­137
hybrid full/partial mesh Frame Relay networks,
540­541
I
ICMP, 217, 697
echo messages, sending/receiving, 375
functions of, 227
messages
Address Mask Request/Reply, 228
Code field, 228
Destination Unreachable, 227­230, 317
Echo, 228, 232
Parameter Problem, 228
Redirect, 228, 231
Router Advertisment and Selection, 228
Source Quench, 227
Time Exceeded, 227, 230­231
Timestamp, 228
Type field, 228
ICND (Interconnecting Cisco Network Devices),
xxi, 6, 11
CCNA exam strategies after taking course, 14­
15
course summary, 11­12
icons
network connections, xix­xx
network devices, xvii­xx
peripheral devices, xviii­xx
ICRC (Introduction to Cisco Router Configuration),
15­16
IDs (bridges), 162
IEEE 802.3,
See
Ethernet
IEEE 802.5,
See
Token Ring
IEEE standards (LANs), 143­144, 202
IGRP (Interior Gateway Routing Protocol), 353,
362, 417
auto summarization, 389, 394
CCNA exam coverage, 361
configuration, 374­403
enabling, 375­376
equal-metric routes, 395
features, 373
IP
configuration, 681­684
enabling, 662­664
metrics, 373, 377­378
packets, displaying log messages, 374
route aggregation, 394
router behavior, 362­363
subnet mask issues, 383­385
updates, displaying log messages, 374
versus RIP, 373, 418
image files (IOS), 48
determining which to load, 50­53
upgrading into Flash memory, 48­50
infinite metrics, 371
integrated multiprotocol routing, 413­416, 421, 674
Interconnecting Cisco Network Devices,
See
ICND
interface command, 35
interface ethernet 0 command, 36
interface serial command, 552, 594
interfaces
displaying information for, 178
Frame Relay, Status Enquiry messages, 675
IP parameters, displaying settings, 273
ISDN, 698
routers, 27
numbering, 28
synchronous serial interfaces, 528
statistics, displaying, 273
summary information, displaying, 273
switches, numbering, 179
tunnel interfaces, 409
See also
ports
Interior Gateway Routing Protocol,
See
IGRP
International Telecommunications Union (ITU),
529, 568
Internetwork Operating System,
See
IOS
Internetworking Technology Multimedia (ITM), 11
Inter-Switch Link,
See
ISL
Introduction to Cisco Router Configuration (ICRC),
15-16
Inverse ARP, 547­548, 674, 697
hostname command
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