Contents
Converting Between Decimal Numbers and Binary
Subnetting a Class C Network Using Binary
Subnetting a Class B Network Using Binary
The Enhanced Bob Maneuver for Subnetting (or How to Subnet Anything in Under a Minute)
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
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
CHAPTER 4 Cables and Connections
Connecting a Rollover Cable to Your Router or Switch
Using a USB Cable to Connect to Your Router or Switch
CHAPTER 5 The Command-Line Interface
Shortcuts for Entering Commands
Using the 
Key to Complete Commands
Using the Question Mark for Help
Using the Pipe Parameter (|) with the show Command
Part II LAN Switching Technologies
CHAPTER 6 Configuring a Switch
Resetting Switch Configuration
Setting IP Addresses and Default Gateways
Setting Interface Descriptions
Managing the MAC Address Table
Configuring Voice and Data with Trust
Configuring Voice and Data Without Trust
CHAPTER 8 VLAN Trunking Protocol and Inter-VLAN Communication
Dynamic Trunking Protocol (DTP)
Setting the VLAN Encapsulation Type
Inter-VLAN Communication Using an External Router: Router-on-a-Stick
Inter-VLAN Communication on a Multilayer Switch Through a Switch Virtual Interface
Remove L2 Switchport Capability of an Interface on an L3 Switch
Configuring Inter-VLAN Communication on an L3 Switch
Configuration Example: Inter-VLAN Communication
CHAPTER 9 Spanning Tree Protocol
Spanning Tree Protocol Definition
Enabling Spanning Tree Protocol
Configuring a Secondary Root Switch
Configuring the Switch Priority of a VLAN
Changing the Spanning-Tree Mode
Spanning-Tree Migration Example: PVST+ to Rapid-PVST+
Interface Modes in EtherChannel
Guidelines for Configuring EtherChannel
Configuring Layer 2 EtherChannel
Configuration Example: EtherChannel
Part III Routing Technologies: IPv4 and IPv6
CHAPTER 11 Configuring a Cisco Router
Entering Global Configuration Mode
Configuring a Serial Interface
Configuring a Fast Ethernet Interface
Configuring a Gigabit Ethernet Interface
Assigning IPv6 Addresses to Interfaces
Creating a Message-of-the-Day Banner
Mapping a Local Hostname to a Remote IP Address
The no ip domain-lookup Command
The logging synchronous Command
EXEC Commands in Configuration Mode: The do Command
Configuration Example: Basic Router Configuration
Configuring an IPv4 Static Route on a Router
Static Routes and Recursive Lookups
The permanent Keyword (Optional)
Floating Static Routes and Administrative Distance (Optional)
Configuring an IPv4 Default Route on a Router
Configuration Example: IPv4 Static Routes
Floating Static Routes in IPv6
Verifying and Troubleshooting IPv6
CHAPTER 13 RIP Next Generation (RIPng)
Implementing RIP Next Generation
Verifying and Troubleshooting RIPng
Configuring Enhanced Interior Gateway Routing Protocol (EIGRP) for IPv4
Adjusting the EIGRP for IPv4 Metric Weights
Adjusting the EIGRPv6 Metric Weights
Configuring EIGRPv6 on an Interface
EIGRP Auto-Summarization for IPv4
EIGRP Manual Summarization for IPv4
Equal-Cost Load Balancing: Maximum Paths
Unequal-Cost Load Balancing: Variance
Troubleshooting EIGRP and EIGRPv6
Configuration Example: EIGRPv6
Using Wildcard Masks with OSPF Areas
OSPF auto-cost reference-bandwidth
Enabling OSPF for IPv6 on an Interface
Interarea OSPFv3 Route Summarization
Enabling an IPv4 Router ID for OSPFv3
Verifying OSPFv2 and OSPFv3 Configurations
Troubleshooting OSPFv2 and OSPFv3
Configuration Example: Single-Area OSPF
Configuration Example: Multiarea OSPF
Configuration Example: IPv6 and OSPFv3
CHAPTER 16 Understanding Point-to-Point Protocols
Configuring High-Level Data Link Control Encapsulation on a Serial Line
Configuring Point-to-Point Protocol (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 Monitoring
Configuring PPP on a Serial Line (Optional Commands): Authentication
Verifying and Troubleshooting a Serial Link/PPP Encapsulation
Configuration Example: PPP with CHAP Authentication
Configuring Multilink Point-to-Point Protocol
Verifying and Troubleshooting MLPPP
Configuring a DSL Connection Using Point-to-Point Protocol over Ethernet
Step 1: Configure PPPoE (External Modem)
Step 2: Configure the Dialer Interface
Step 3: Define Interesting Traffic and Specify Default Routing
Step 4: Configure NAT (Choose 1 Method Only)
Step 4a: Configure NAT Using an ACL
Step 4b: Configure NAT Using a Route Map
Step 5: Configure DHCP Service
Step 7: Verify a PPPoE Connection
CHAPTER 17 External Border Gateway Protocol (eBGP)
Configuring Border Gateway Protocol
Troubleshooting BGP Connections
CHAPTER 18 Configuring Generic Routing Encapsulation (GRE) Tunnels
CHAPTER 19 Quality of Service (QoS)
High Availability for Voice and Video
Configuring Auto-QoS: 2960-X/3650/3750
Verifying Auto QoS: 2960-X/3650/3750
Verifying Auto-QoS Information: 6500
Part V Infrastructure Services
Configuring a DHCP Server on an IOS Router
Using Cisco IP Phones with a DHCP Server
Verifying and Troubleshooting DHCP Configuration
Configuring a DHCP Helper Address
DHCP Client on a Cisco IOS Software Ethernet Interface
CHAPTER 21 First Hop Redundancy Protocols (FHRP): Hot Standby Router Protocol (HSRP)
Default HSRP Configuration Settings
CHAPTER 22 Network Address Translation (NAT)
Private IP Addresses: RFC 1918
Configuring Dynamic Network Address Translation: 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 Configurations
Troubleshooting NAT and PAT Configurations
Part VI Infrastructure Security
CHAPTER 23 Switch Port Security
Configuring Static MAC Addresses
Verifying Switch Port Security
Recovering Automatically from Error-Disabled Ports
Verifying Autorecovery of Error-Disabled Ports
CHAPTER 24 Managing Traffic Using Access Control Lists (ACL)
Applying Standard ACLs to an Interface
Applying Extended ACLs to an Interface
Using Sequence Numbers in Named ACLs
Removing Specific Lines in Named ACLs Using Sequence Numbers
Including Comments About Entries in ACLs
Restricting Virtual Terminal Access
Configuration Examples: IPv4 ACLs
Configuration Examples: IPv6 ACLs
Securing Cisco Device According to Recommended Practices
Securing Cisco IOS Routers Checklist
Components of a Router Security Policy
Restricting Virtual Terminal Access
Part VII Infrastructure Management
CHAPTER 26 Backing Up and Restoring Cisco IOS Software and Configurations
Viewing the Cisco IOS File System
Commonly Used URL Prefixes for Cisco Network Devices
Deciphering IOS Image Filenames
Backing Up Configurations to a TFTP Server
Restoring Configurations from a TFTP Server
Backing Up the Cisco IOS Software to a TFTP Server
Restoring/Upgrading the Cisco IOS Software from a TFTP Server
Restoring the Cisco IOS Software from ROM Monitor Mode Using Xmodem
Restoring the Cisco IOS Software Using the ROM Monitor Environmental Variables and tftpdnld Command
Configuring a Secure Copy Server
Verifying and Troubleshooting Secure Copy
Configuration Example: Using Secure Copy
CHAPTER 27 Password Recovery Procedures and the Configuration Register
A Visual Representation of the Configuration Register
Console Terminal Baud Rate Settings
Changing the Console Line Speed: CLI
Changing the Console Line Speed: ROM Monitor Mode
Password-Recovery Procedures for Cisco Routers
Password Recovery for 2960 Series Switches
CHAPTER 28 Cisco Discovery Protocol (CDP) and Link Layer Discovery Protocol (LLDP)
Verifying and Troubleshooting CDP
Link Layer Discovery Protocol (802.1AB)
Verifying and Troubleshooting LLDP
Configuring a Device to Accept a Remote Telnet Connection
Using Telnet to Remotely Connect to Other Devices
Internet Control Message Protocol Redirect Messages
Examples of Using the ping and the Extended ping Commands
Simple Network Management Protocol
Network Time Protocol Configuration
CHAPTER 31 Cisco IOS Licensing
Cisco Licensing Earlier Than IOS 15.0
Cisco Licensing for the ISR G2 Platforms: IOS 15.0 and Later
Installing a Permanent License
Installing an Evaluation License
CHAPTER 32 Basic Troubleshooting
Determining the Gateway of Last Resort
Determining the Last Routing Update
Interpreting the show interface Command
Operating System IP Verification Commands
APPENDIX A Binary/Hex/Decimal Conversion Chart