Free CCNA | Standard ACLs | Day 34 Lab | CCNA 200-301 Complete Course

Introduction

This tutorial will guide you through the process of configuring standard IPv4 Access Control Lists (ACLs) as part of the CCNA 200-301 Complete Course. Understanding and implementing ACLs is crucial for network security and management, enabling you to control the flow of traffic within a network.

Step 1: Access Your Device and Enter Configuration Mode

1. Connect to Your Router or Switch:

   • Use a console cable to connect to your networking device.
   • Open a terminal emulator (like PuTTY or Tera Term).

2. Enter Privileged EXEC Mode:

   • Type enable and press Enter.
   • You may need to enter a password if prompted.

3. Enter Global Configuration Mode:

   • Type configure terminal and press Enter.

Step 2: Create a Standard ACL

1. Define the ACL:

   • Use the following command to create a standard ACL:

     access-list [ACL_NUMBER] [permit|deny] [SOURCE_IP] [WILDCARD_MASK]
     

   • Example to permit traffic from the IP address 192.168.1.10:

     access-list 10 permit 192.168.1.10 0.0.0.0
     

2. Verify the ACL:

   • Check the configuration by typing:

     show access-lists
     

   • This command will display all your ACLs and their rules.

Step 3: Apply the ACL to an Interface

1. Select the Correct Interface:

   • Enter the interface configuration mode for the interface you want to apply the ACL to:

     interface [INTERFACE_TYPE] [INTERFACE_NUMBER]
     

   • For example:

     interface GigabitEthernet0/0
     

2. Apply the ACL:

   • Use the following command to apply the ACL to the interface:

     ip access-group [ACL_NUMBER] [in|out]
     

   • Example:

     ip access-group 10 in
     

3. Exit Interface Configuration Mode:

   • Type exit to return to global configuration mode.

Step 4: Save Your Configuration

1. Save the Configuration:
   • To ensure your ACLs persist after a reboot, save your configuration by typing:

     write memory
     

   • Alternatively, you can use:

     copy running-config startup-config
     

Conclusion

You have now successfully configured a standard IPv4 Access Control List and applied it to an interface. This fundamental skill is essential for managing network traffic effectively and enhancing security.

Next Steps

• Experiment with different ACL configurations to understand their behavior.
• Review additional ACL types, such as extended ACLs, for more complex filtering capabilities.
• Consider using tools like Boson NetSim for practical labs to further your understanding and skills.