External Network Penetration Tasting From Harlem To Harare

August 29, 2023

In today’s digital landscape, the need for robust cybersecurity measures extends beyond firewalls and antivirus programs.

One key element that is often overlooked is external network penetration testing. This article will explore what this subject entails, the various forms it can take, why it’s crucial, and the steps for getting ready for it. Whether you’re an expert in cybersecurity or a business owner concerned about safety, it’s vital to grasp the methods and instruments used.

What is an External Network Penetration Test?

External network penetration testing is a targeted, authorized attempt to evaluate the security of the externally facing assets of a network. This involves identifying vulnerabilities in servers, hosts, devices, and network services that could be exploited by attackers. It helps companies understand what an actual cyber-attack would look like and how well their defenses would hold up.

Types of External Network Penetration Testing

There are various types of external penetration tests, including:

  • Black Box Testing: Tester has no prior knowledge of the system.
  • White Box Testing: Tester has full visibility into source code and architecture.
  • Grey Box Testing: A mixture of both black and white box testing.
  • Infrastructure Penetration Testing: Focuses on the underlying infrastructure.
  • External Pentest: Targeted at externally facing assets like web applications.

Why External Network Penetration Testing is Essential

In today’s highly connected environment, businesses depend on external networks for a range of functions, from customer engagement to data storage. This increasing reliance exposes them to greater cyber risks, making external network penetration testing a crucial element in any cybersecurity strategy. Conducting such tests enables organizations to proactively discover and fix vulnerabilities, thereby improving their overall security. These tests are often required for compliance with various regulations like GDPR and HIPAA, helping organizations avoid legal complications and fines. They also assess the security of third-party and open-source tools, which are commonly used but can introduce vulnerabilities. By demonstrating a secure network, companies can increase customer trust and gain a competitive edge. Moreover, the cost of a cyber-attack can be debilitating; investing in penetration testing can significantly minimize this risk. As cyber threats continuously evolve, regular testing ensures that defenses are updated against new vulnerabilities. Detailed reports from these tests guide decision-makers in resource allocation for improved security. In essence, external network penetration testing is a multi-faceted tool for enhancing cybersecurity, aiding in regulatory compliance, and building customer trust.

Preparing for an External Penetration Test

Preparing for an external penetration test is a critical step to ensure the process is effective and yields meaningful results. Here’s how to go about it:

Understand the Scope and Objectives

The first step in preparation is to clearly understand what you want to achieve with the test. Is the focus on compliance, identifying vulnerabilities, or both? Knowing the objectives helps in defining the scope, which can include specific systems, applications, or entire network ranges that will be tested.

Get Stakeholder Buy-in

Before commencing with the test, it’s essential to get the approval and buy-in from key stakeholders. This includes not only the IT department but also legal, compliance, and senior management. Their input could be crucial in defining the objectives and scope of the test.

Legal and Regulatory Compliance

Ensure that you have the legal right to perform the test on the chosen targets. This may require formal consent from third-party service providers and an understanding of local and international laws concerning cybersecurity.

Select a Testing Team

Whether you are using an internal team or hiring an external penetration testing company (more information about penetration testing on this site), due diligence is essential. Verify the team’s credentials, experience, and methodology to make sure they align with your objectives.

Inventory of Assets

Prepare an inventory list of all the hardware, software, network devices, and applications that are part of the scope. This helps the testing team to better understand the environment they will be evaluating.

Backup Data and Systems

Before the test, backup essential data and systems as a safety measure. While penetration tests are generally non-destructive, it’s better to be prepared for any unintended disruptions.

Establish a Communication Plan

Set up a communication plan that outlines who will be notified at various stages of the test, especially if something critical is discovered. Quick communication can sometimes be crucial in mitigating risks promptly.

Schedule the Test

Finally, coordinate with the testing team to schedule the test at a time that minimizes impact on daily operations. Make sure to notify all relevant personnel so they are aware that the test is happening and can act accordingly if they notice unusual network activity.

By adequately preparing for an external penetration test, you pave the way for a more efficient and effective testing process. This ultimately helps in better securing your organization’s external-facing assets against cyber threats.

External Network Penetration Testing Methodology

The methodology behind external network penetration testing serves as a structured approach to identify vulnerabilities, assess risks, and offer recommendations for securing a network. Below is an outline of a typical methodology for conducting an external network penetration test:

Planning and Scoping

Before the test begins, it’s crucial to define its scope. This may include identifying the range of IP addresses, systems, and applications to be tested. Objectives are set, timelines are established, and any legal considerations, such as consent and compliance requirements, are clarified.


The first active phase of the test involves gathering as much information as possible about the target network. This could involve identifying active hosts, open ports, and various services running on servers. Reconnaissance can also include researching publicly available information that could be useful for the test.

Vulnerability Assessment

In this phase, automated tools and manual techniques are used to identify potential vulnerabilities in the network, applications, and other services. Common tools may include vulnerability scanners and specialized software designed for this purpose.


This is the core phase of the test where identified vulnerabilities are actively exploited to see how far an attacker could penetrate the network. This can involve trying to gain unauthorized access to systems, escalating privileges, or accessing sensitive information.

Post-Exploitation Analysis

After the exploitation phase, the tester documents what was accessed and how, thereby assessing the potential impact of the vulnerabilities. This can involve mapping out how internal systems could be compromised or data could be accessed and could be used to inform further security measures.


An in-depth analysis is compiled, encapsulating the results of the test, identifying security weaknesses, potentially accessible data, and suggestions for bolstering network security. This report acts as an all-encompassing manual to help the organization grasp its existing security status and the actions required to improve its security defenses.

Review and Remediation

After the report is presented, it’s crucial to review the findings and implement the recommended security improvements. Some organizations opt for a re-test after this phase to ensure that all vulnerabilities have been effectively mitigated.

By adhering to this methodology, an organization can ensure that its external network penetration testing process is thorough, complies with best practices, and provides actionable insights to improve overall security.

Common Tools Used in External Network Penetration Testing

Several tools can be used in external network penetration testing, such as:

  • Nmap: For network mapping.
  • Metasploit: For developing, testing, and executing exploit code.
  • Wireshark: For capturing and analyzing network packets.

How to Choose an External Penetration Testing Service

When looking to hire external penetration testing services, consider the following:

  • Expertise: How skilled are they in various types of tests including web application penetration testing and infrastructure pen testing?
  • Reputation: What do other customers say about them?
  • Cost: Does the cost match your budget and the value the service provides?

External network penetration testing is a crucial component of a comprehensive cybersecurity strategy. It helps organizations identify vulnerabilities in their externally facing assets and provides actionable insights to improve their security posture. If you’re interested in ensuring that your network is as secure as possible, consider engaging the services of a reputable penetration testing company.

This content is part of the HWM Partnership.

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