CCNA Portable Command Guide
暫譯: CCNA 便攜式指令指南

Book Description

All the CCNA-level commands in one compact, portable resource 

• Access all CCNA commands–use as a quick, offline resource for research and solutions
• Logical “how-to” topic groupings provide one-stop research
• Great for review before CCNA certification exams
• Compact size makes it easy to carry with you, wherever you go
• “Create your own journal” section with blank, lined pages allows you to personalize the book for your needs

Preparing for the CCNA® exam? Working as a network administrator? Here are all the CCNA-level commands you need in one condensed, portable resource. The CCNA Portable Command Guide is filled with valuable, easy-to-access information, and portable enough for use whether you’re in the server room or the equipment closet.

 

This book will help you memorize commands and concepts as you work to pass the CCNA exam (INTRO 640-821, ICND 640-811, or CCNA 640-801). The guide summarizes all CCNA certification-level Cisco IOS® Software commands, keywords, command arguments, and associated prompts, providing you with tips and examples of how to apply the commands to real-world scenarios. Configuration examples throughout the book provide you with a better understanding of how these commands are used in simple network designs.

 

Nine CCNA topic areas are covered, including:

• TCP/IP
• An Introduction to Cisco Devices
• Configuring a Router
• Routing
• Switches
• Network Administration and Troubleshooting
• Managing IP Services
• WANs
• Network Security

This book is part of the Cisco Press® Certification Self-Study Product Family, which offers readers a self-paced study routine for Cisco certification exams. Titles in the Cisco Press Certification Self-Study Product Family are part of a recommended learning program from Cisco Systems® that includes simulation and hands-on training from authorized Cisco Learning Partners and self-study products from Cisco Press.

Table of Contents

Introduction

 

Part I                                TCP/IP

 

Chapter 1                                How to Subnet

Class A–E Addresses

Converting Between Decimal Numbers and Binary

Subnetting a Class C Network Using Binary

Subnetting a Class B Network Using Binary

Binary ANDing

Question 1

Answer

Question 2

Answer

So Why AND?

Shortcuts in Binary ANDing

The Enhanced Bob Maneuver for Subnetting

 

Chapter 2                                VLSM

IP Subnet Zero

VLSM Example

Step 1 Determine How Many H Bits Will Be Needed to

Satisfy the Largest Network

Step 2 Pick a Subnet for the Largest Network to Use

Step 3 Pick the Next Largest Network to Work With

Step 4 Pick the Third Largest Network to Work With

Step 5 Determine Network Numbers for Serial Links

 

Chapter 3                                Route Summarization

Example for Understanding Route Summarization

Step 1: Summarize Winnipeg’s Routes

Step 2: Summarize Calgary’s Routes

Step 3: Summarize Edmonton’s Routes

Step 4:  Summarize Vancouver’s Routes

Route Summarization and Route Flapping

Requirements for Route Summarization

 

Part II   Introduction to Cisco Devices

 

Chapter 4                          Cables and Connections

Connecting a Rollover Cable to Your Router or Switch

Terminal Settings

LAN Connections

Serial Cable Types

Which Cable to Use?

568A Versus 568B Cables

 

Chapter 5                          The Command-Line Interface

Shortcuts for Entering Commands

Using the † Key to Complete Commands

Using the Question Mark for Help

enable

Command                                                          

44 exit

Command        

44 disable

Command                                                         

45 logout

Command

Setup Mode

Keyboard Help

History Commands

show Commands

 

Part III  Configuring a Router

 

Chapter 6                          Configuring a Single Cisco Router

Router Modes

Global Configuration Mode

Configuring a Router Name

Configuring Passwords

Password Encryption

show Commands

Interface Names

Moving Between Interfaces

Configuring a Serial Interface

Configuring an Ethernet/Fast Ethernet Interface

Creating an MOTD Banner

Setting the Clock Time Zone

Assigning a Local Host Name to an IP Address

no ip domain-lookup Command

logging synchronous Command

exec-timeout Command

Saving Configurations

Erasing Configurations

Configuration Example: Basic Router Configuration

 

Part IV Routing

 

Chapter 7                                Static Routing

Static Routing

The permanent Keyword (Optional)

Static Routes and Administrative Distance (Optional)

Default Routing

Verifying Static Routes

Configuration Example: Static Routes

 

Chapter 8                                RIP

IP Classless

RIP Routing: Mandatory Commands

RIP Routing: Optional Commands

RIP Version 2

Troubleshooting RIP Issues

RIP Version 2: Mandatory Commands

RIP Version 2: Optional Commands

Configuration Example: RIP-2 Routing

 

Chapter 9                                IGRP

IGRP Routing: Mandatory Commands

IGRP Routing: Optional Commands

Troubleshooting IGRP Issues

 

Chapter 10                                EIGRP

Configuring EIGRP

EIGRP Auto Summarization

Verifying EIGRP

Troubleshooting EIGRP

Configuration Example: EIGRP

 

Chapter 11                                Single-Area OSPF

OSPF Routing: Mandatory Commands

Wildcard Masks

Using Wildcard Masks with OSPF Areas

OSPF Routing: Optional Commands

Loopback Interfaces

OSPF DR/BDR Election

Modifying OSPF Cost Metrics

OSPF Authentication: Simple

OSPF Authentication Using MD5 Encryption

OSPF Timers

Propagating a Default Route

Verifying OSPF Configuration

Troubleshooting OSPF

Configuration Example: Single-Area OSPF

 

Part V  Switches

 

Chapter 12                          Configuring a Switch

Help Commands

Command Modes

Verifying Commands

Resetting Switch Configuration

Setting Host Names

Setting Passwords: 1900 Series Switches

Setting Passwords: 2900/2950 Series Switches

Setting IP Address and Default Gateway

Setting Interface Descriptions

Setting Duplex Settings: 1900 or 2900/2950 Series Switches

Setting Speed Settings: 2900/2950 Series Switches

Setting Web-Based Interface for Configuration: 1900 and 2900/

2950 Series Switches

Managing the MAC Address Table: 1900 and 2900/2950 Series

Switches

Configuring Static MAC Addresses

Port Security: 1900 Series Switches

Verifying Port Security

Configuration Example: 2900 Series Switch

 

Chapter 13                          Spanning Tree Protocol and EtherChannel

Spanning Tree Protocol

Spanning-Tree Verification

Change Spanning-Tree Priority of a Switch

Changing the Cost of Spanning Tree on an Interface

Changing the State of Spanning Tree on an Interface

Spanning Tree Portfast BPDU Guard Command

EtherChannel

EtherChannel Configuration

Verification of EtherChannel

EtherChannel Tips

 

Chapter 14                                VLANs

Displaying VLAN Information

Creating Static VLANs

Assigning Ports to VLANs

Assigning Ports Using the range Command (2950 Switch

Only)

Saving VLAN Configurations

Erasing VLAN Configurations

Troubleshooting VLANs

Configuration Example: 2900 Switch Configuration

 

Chapter 15                                VTP and Inter-VLAN Communication

Configuring ISL Trunks

Configuring Dot1Q Trunks

Verifying Trunking

VTP Configuration

Confirming VTP Configuration

Inter-VLAN Communication: Router-on-a-Stick

Router-on-a-Stick Tips

Configuration Example: VTP and Inter-VLAN Routing

 

Part VI Network Administration and Troubleshooting

 

Chapter 16                                Backing Up and Restoring Cisco IOS Software and

Configurations

Boot System Commands

Cisco IOS Software Prerelease 12.0 Commands Versus Cisco

IOS Software 12.x Commands

Backing Up Configurations

Restoring Configurations

Backing Up IOS to a TFTP Server

Restoring/Upgrading IOS from a TFTP Server

Restoring IOS from ROMmon Mode Using Xmodem

Restoring the IOS Using the ROMmon Environmental Variables and tftpdnld Command

Upgrading Catalyst 1900 Firmware with a TFTP Server

Copying IOS to TFTP Server

Firmware Upgrade of Catalyst 2950 Series Switches

Configuration Example: 2900 Series Switch

 

Chapter 17                                Password Recovery Procedures and the

Configuration Register

The Configuration Register

The Configuration Register: A Visual Representation

The Configuration Register—What the Bits Mean

The Boot Field

Console Terminal Baud Rate Settings

Changing the Console Line Speed—CLI

Changing the Console Line Speed—ROM Monitor

Mode—1700/2600 Series

Password Recovery Procedures for Cisco Routers

Password Recovery for 1900 Series Switches

Password Recovery for 2900/2950 Series Switches

 

Chapter 18                          CDP

Cisco Discovery Protocol

 

Chapter 19                          Telnet

Telnet

 

Chapter 20                          ping and traceroute

ICMP Redirect Messages

ping Command

ping

traceroute

 

Chapter 21                          SNMP and Syslog

Configuring SNMP

Configuring Syslog

 

Chapter 22                          Basic Troubleshooting

Viewing the Routing Table

Determining the Gateway of Last Resort

Determining the Last Routing Update

OSI Layer 3 Testing

OSI Layer 7 Testing

Interpreting the show interface Command

Clearing Interface Counters

Using CDP to Troubleshoot

traceroute Command

show controllers Command

debug Commands

Using Timestamps

OS IP Verification Commands

ip http server Command

netstat Command

Part VII                                Managing IP Services

 

Chapter 23                                NAT

Configuring Dynamic NAT: One Private to One Public Address

Translation

Configuring PAT: Many Private to One Public Address

Translation

Configuring Static NAT: One Private to One Permanent Public

Address Translation

Verifying NAT and PAT Configuration

Troubleshooting NAT and PAT Configuration

Configuration Example: Port Address Translation

 

Chapter 24                                DHCP

Configuring DHCP

Verifying and Troubleshooting DHCP Configuration

Configuring a DHCP Helper Address

Configuration Example: DHCP

 

Part VIII                                Wide-Area Networks

 

Chapter 25                                HDLC and PPP

Configuring HDLC Encapsulation on a Serial Line

Configuring PPP on a Serial Line (Mandatory Commands)

Configuring PPP on a Serial Line (Optional Commands): Compression

Configuring PPP on a Serial Line (Optional Commands): Link Quality

Configuring PPP on a Serial Line (Optional Commands): Multilink

Configuring PPP on a Serial Line (Optional Commands): Authentication

Verifying or Troubleshooting a Serial Link/PPP Encapsulation

Configuration Example: PPP

 

Chapter 26                                ISDN and DDR

Configuring ISDN BRI: Setting the Switch Type

Configuring ISDN BRI: Setting SPIDs

Configuring ISDN PRI

Verifying ISDN Configuration

Troubleshooting ISDN

Configuring Legacy DDR

Configuring Dialer Profiles with DDR

Configuration Example: ISDN and DDR with No Dialer

Profiles

 

Chapter 27                          Frame Relay

Configuring Frame Relay: Setting the Frame Relay

Encapsulation Type

Configuring Frame Relay: Setting the Frame Relay

Encapsulation LMI Type

Configuring Frame Relay: Setting the Frame Relay DLCI Number

Configuring a Frame Relay Map

Configuring a Description of the Interface (Optional)

Configuring Frame Relay Using Subinterfaces

Verifying Frame Relay

Troubleshooting Frame Relay

Configuration Example: Frame Relay

 

Part IX Network Security

 

Chapter 28                          IP Access Control List Security

Access List Numbers

ACL Keywords

Creating Standard ACLs

Applying a Standard ACL to an Interface

Verifying ACLs

Removing an ACL

Creating Extended ACLs

The established Keyword

Creating Named ACLs

Using Sequence Numbers in Named ACLs

Removing Specific Lines in a Named ACL Using Sequence

Numbers

Sequence Number Tips

Including Comments About Entries in ACLs

Applying an Extended ACL to an Interface

Restricting Virtual Terminal Access

Configuration Example: Access Control Lists

 

Part X  Appendixes

 

Appendix A                          Complete Configuration Example

Appendix B                          Binary/Hex/Decimal Conversion Chart

Appendix C                          Create Your Own Journal Here