Basic Cisco Packet Tracer Commands (CLI)

Introduction

This tutorial provides a comprehensive guide to basic Cisco Packet Tracer commands used in the CLI (Command Line Interface). Understanding these commands is crucial for configuring Cisco routers effectively in networking simulations. The tutorial covers different modes of operation, allowing you to navigate and utilize Packet Tracer efficiently.

Step 1: Understand the Modes of Operation

Cisco devices operate in several modes, each with specific commands and functionalities:

1. User EXEC Mode

   • Accessed after initial login.
   • Limited commands; primarily for monitoring.
   • Prompt: Router>

2. Privileged EXEC Mode

   • Accessed from User EXEC Mode by typing enable.
   • Provides access to more advanced commands.
   • Prompt: Router#

3. Global Configuration Mode

   • Accessed from Privileged EXEC Mode by typing configure terminal.
   • Used for setting global parameters and configurations.
   • Prompt: Router(config)

4. Interface Configuration Mode

   • Accessed from Global Configuration Mode by typing interface [interface_type] [interface_number].
   • Used to configure specific interfaces (e.g., Ethernet).
   • Prompt: Router(config-if)

5. ROMMON (Read-Only Memory Monitor)

   • A mode for basic troubleshooting and recovery.
   • Accessed during boot-up by interrupting the process.

Step 2: Basic Commands in Each Mode

Familiarize yourself with essential commands in each mode for effective configuration:

• User EXEC Mode Commands

  • show version: Displays device information.
  • show ip interface brief: Shows the status of interfaces.

• Privileged EXEC Mode Commands

  • enable: Switches to Privileged EXEC Mode.
  • show running-config: Displays the current configuration.

• Global Configuration Mode Commands

  • hostname [name]: Sets the device's name.
  • enable secret [password]: Configures a password for Privileged EXEC mode.

• Interface Configuration Mode Commands

  • ip address [ip_address] [subnet_mask]: Assigns an IP address to an interface.
  • no shutdown: Activates the interface.

Step 3: Practice Common Configuration Tasks

To build your skills, practice the following common tasks:

1. Set the Router Hostname

   • Enter Global Configuration Mode.
   • Use the command:

     hostname MyRouter
     

2. Configure a Basic Interface

   • Access Interface Configuration Mode:

     interface GigabitEthernet0/0
     

   • Assign an IP address:

     ip address 192.168.1.1 255.255.255.0
     

   • Enable the interface:

     no shutdown
     

3. Set Console and VTY Passwords

   • Enter Global Configuration Mode and use:

     line con 0
     password myConsolePassword
     login
     

   • For VTY lines:

     line vty 0 4
     password myVTYPassword
     login
     

Conclusion

In this tutorial, we've covered the essential Cisco Packet Tracer commands within different modes of operation. By understanding these commands and practicing configuration tasks, you will enhance your networking skills. Next steps could include exploring advanced configurations or engaging in more complex networking scenarios using Packet Tracer. Happy networking!