Todd Lammle's CCNA/CCENT IOS Commands Survival Guide

Introduction xi
Chapter 1 Basic IOS Commands 1
Booting the Router 2
Setup Mode 4
Router Configuration Modes 4
Editing and Help Features 6
Configuring a Router 8
Hostnames 9
Banners 9
Passwords 10
Router Interfaces 14
Viewing, Saving, and Erasing Configurations 18
Using the show Command 19
Troubleshooting with the show interfaces Command 22
Chapter 2 Managing a Cisco Internetwork 25
Understanding the Internal Components of a Cisco Router 26
Managing the Configuration Register 27
Checking the Current Configuration Register Value 27
Changing the Configuration Register 28
Recovering Passwords 30
Using Boot System Commands 32
Backing Up and Restoring the Cisco IOS 33
Verifying Flash Memory 33
Backing Up the Cisco IOS 34
Restoring or Upgrading the Cisco Router IOS 36
Using the Cisco IOS File System (Cisco IFS) 36
Backing Up and Restoring the Cisco Configuration 39
Backing Up the Cisco Router Configuration 39
Restoring the Cisco Router Configuration 41
Erasing the Configuration 41
Using the Cisco IOS File System to Manage Your
Router's Configuration (Cisco IFS) 42
Using Cisco Discovery Protocol (CDP) 43
Getting CDP Timers and Holdtime Information 44
Gathering Neighbor Information 45
Gathering Interface Traffic Information 47
Gathering Port and Interface Information 47
Using Telnet 48
Telnetting into Multiple Devices Simultaneously 49
Checking Telnet Connections 50
Checking Telnet Users 50
Closing Telnet Sessions 51
Resolving Hostnames 52
Building a Host Table 52
Using DNS to Resolve Names 54
Checking Network Connectivity and Troubleshooting 55
Using the ping Command 56
Using the traceroute Command 56
Debugging 57
Using the sh processes Command 59
Chapter 3 IP Routing 61
Routing Basics 62
Static Routing 65
Default Routing 67
Routing Protocol Basics 69
Administrative Distances (ADs) 69
Routing Information Protocol (RIP) 70
RIP Timers 71
Enabling RIP 72
Holding Down RIP Propagations 73
RIP Version 2 (RIPv2) 73
Verifying RIP 75
The show ip protocols Command 75
The debug ip rip Command 76
Chapter 4 Enhanced IGRP (EIGRP) and Open Shortest Path First (OSPF) 79
Understanding EIGRP Basics 80
Configuring EIGRP 80
Holding Down EIGRP Propagations 81
Setting Maximum Paths and Hop Count 82
Using Redistribution Commands 83
Configuring Discontiguous Networks 84
Load Balancing with EIGRP 85
Using Route Authentication with EIGRP 89
Verifying EIGRP 90
Understanding Open Shortest Path First (OSPF) Basics 94
Configuring OSPF 95
Enabling OSPF 95
Configuring OSPF Areas 96
Verifying OSPF Configuration 96
Using the show ip ospf Command 98
Using the show ip ospf database Command 99
Using the show ip ospf interface Command 99
Using the show ip ospf neighbor Command 100
Using the show ip protocols Command 101
Debugging OSPF 102
Chapter 5 Layer-2 Switching and Spanning-Tree Protocol (STP) 105
Switching Services 106
Three Switch Functions at Layer 2 107
Basic Switch Configurations 108
Switch Security 109
Spanning-Tree Operations 111
Optimizing Spanning-Tree Operations 113
EtherChannel 117
Verifying Cisco Catalyst Switches 119
Chapter 6 Virtual LANs (VLANs) 127
Understanding VLAN Basics 128
Configuring VLANs 128
Verifying VLAN Creation 130
Assigning Switch Ports to VLANs 130
Configuring Trunk Ports 132
Configuring Inter-VLAN Routing 136
Configuring VTP 137
Telephony: Configuring Voice VLANs 139
Configuring the Voice VLAN 140
Chapter 7 Security 143
Perimeter Routers, Firewalls, and Internal Routers 144
Recognizing Security Threats 144
Using Cisco IOS Firewall 146
Introduction to Access Lists 147
Standard Access Lists 148
Wildcard Masking 150
Controlling VTY (Telnet) Access 151
Extended Access Lists 151
Named Access Lists 157
Switch Port ACLs 159
Time-Based ACLs 161
Monitoring Access Lists 163
Chapter 8 Network Address Translation (NAT) 167
When Do We Use NAT? 168
Types of Network Address Translation 169
NAT Names 170
Static NAT Configuration 171
Dynamic NAT Configuration 172
PAT (Overloading) Configuration 173
Simple Verification of NAT 174
Chapter 9 Internet Protocol Version 6 (IPv6) 177
Why Do We Need IPv6? 178
IPv6 Addressing and Expressions 179
Shortened Expression 180
Configuring Cisco Routers with IPv6 181
Stateless Auto Configuration 182
IPv6 Static Routing 182
IPv6 Routing Protocols 183
RIPng 183
EIGRPv6 184
OSPFv3 185
Verifying RIPng 187
Verifying EIGRPv6 190
Verifying OSPFv3 191
Chapter 10 Wide Area Networks (WANs) 195
Introduction to Wide Area Networks 196
Defining WAN Terms 197
WAN Support 197
Point-to-Point Serial Links 200
High-Level Data-Link Control (HDLC) Protocol 201
Point-to-Point Protocol (PPP) 202
Configuring PPP on Cisco Routers 203
Configuring PPP Authentication 204
Verifying PPP Encapsulation 205
Introduction to Frame Relay Technology 210
Frame Relay Encapsulation Types 211
Data Link Connection Identifiers (DLCIs) 212
Local Management Interface (LMI) 213
Frame Relay Implementation and Monitoring 216
GRE Tunnels 225
Verifying a GRE Tunnel 226
Chapter 11 IP Services 227
Network Monitoring and Management Services 228
Simple Network Management Protocol (SNMP) 228
Syslog 230
First Hop Redundancy and Load Balancing 231
Hot Standby Routing Protocol (HSRP) 232
Gateway Load Balancing Protocol (GLBP) 234
Index 237