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Unveiling Network Vulnerabilities

Hacking Cisco Networks with Kali Linux

By Joshua ThorntonPublished 6 days ago 3 min read
“the quieter you are the more you can hear”

Welcome to our exploration of network vulnerabilities through ethical hacking using Kali Linux. In our previous tutorials, we covered the installation of Kali Linux on a Windows 10 computer and delved into the intricacies of hacking Cisco networks. Today, we'll take a deeper dive into network security, specifically focusing on the vulnerabilities that arise when networks are poorly configured.

Before we delve into the technical aspects, it's crucial to underscore the significance of proper network configuration. Neglecting this fundamental aspect can expose networks to vulnerabilities that malicious actors can exploit. To ensure network security, it's essential to configure networks correctly and securely.

The Protocols: DTP and VTP

Our primary focus today will be on two critical network protocols: Dynamic Trunking Protocol (DTP) and VLAN Trunking Protocol (VTP). These protocols, when left unattended, can create vulnerabilities in your network. We'll demonstrate how attackers can leverage these protocols to manipulate network settings and disrupt network operations.

The Vulnerabilities

In our demonstration, we'll illustrate the vulnerabilities associated with poorly configured networks, all through the lens of Kali Linux. Here's a glimpse of what we'll cover:

1. Dynamic Trunking Protocol (DTP): DTP is often enabled by default on Cisco switches. We'll show you how attackers can exploit DTP to manipulate trunking settings, potentially gaining unauthorized access to multiple VLANs and network segments.

2. VLAN Trunking Protocol (VTP): VTP, while useful for managing VLAN configurations, can become a significant security risk if misconfigured. We'll demonstrate how attackers can utilize Kali Linux to inject VTP packets into the network, leading to the unintended deletion of VLANs and potential disruptions in network communication.

Our Lab Setup

To illustrate these vulnerabilities, we've established a controlled lab environment comprising the following components:

- A Cisco switch (Catalyst 2960cg)

- A Windows 10 laptop connected to Port 1

- A MacBook connected to Port 2

- A Kali Linux host

- A connection to the switch console via USB

Our lab configuration allows us to efficiently control and observe network behavior.

Demonstrating DTP and VTP Attacks

1. DTP Attack: We'll illustrate how attackers can launch a DTP attack by deceiving the switch into enabling trunking on a specific port. This manipulation grants them visibility into multiple VLANs, potentially compromising network security.

2. VTP Attack: VTP, designed to simplify VLAN management, can be manipulated to automatically delete VLANs from a switch. By sending malicious VTP packets, attackers can effectively remove devices from a VLAN, causing network disruptions.

Ethical Hacking and Responsibility

Before we proceed, it's imperative to emphasize the ethical nature of our hacking demonstrations. The goal of ethical hacking is to expose vulnerabilities and safeguard networks from malicious attacks, not to exploit them. Always conduct ethical hacking within legal and responsible boundaries.


In this demonstration, we've explored the network vulnerabilities stemming from poor network configuration. Ethical hackers strive to uncover these vulnerabilities to protect networks from potential threats.

Stay tuned for future content where we'll delve into advanced hacking techniques and strategies to fortify your network against such vulnerabilities. If you found this exploration insightful, don't forget to subscribe for updates on ethical hacking practices.

Remember, ethical hacking is a potent tool for enhancing network security and preserving the integrity of the digital world.

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Comments (2)

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  • Bozhan Bozhkov3 days ago

    Thank you for sharing. I started studying for penetration tester, so any information of this kind will be helpful for me.

  • Very interesting! Good job!

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