Your Guide to CCENT and CCNA IOS Commands This book is an ideal supplement to Todd Lammle's CCENT and CCNA Study Guides, and a great quick reference for any Cisco networking administrator. Covering IOS version 15, each chapter begins with a short introduction, explaining what tasks will be discussed, followed by detailed explanations of and examples of the commands. The book includes an easy-to-navigate table of commands broken into the following topic areas: * Internetworking and TCP/IP * Cisco command line interface (CLI) and Security Device Manager (SDM) * Router Configuration * LAN Switch Configuration * Advanced IOS and Troubleshooting * Access Lists * Network Address Translation * Wireless * Wide Area Networks * Security * IPv6 Whether you are studying for your CCENT or CCNA certification, or are a seasoned Cisco networking administrator, this IOS Commands Survival Guide is the perfect reference to help you achieve your goals.

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InhaltsangabeIntroduction 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 SpanningTree 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 Swit