Penetration Testing: What to Expect and How to Prepare

A practical guide to scoping a penetration test, what happens during one, and how to use the results.

By Analytics Nest Team, published 2026-09-03. Category: CYBERSECURITY.

What a penetration test is

A penetration test is a controlled attack on your systems, carried out by security specialists with your permission. The goal is to find weak spots before real attackers do, and to show how far an attacker could get if they found one.

Agree on the scope first

A good test starts with a clear scope. Decide which systems are included, which are off-limits, and when testing can take place. Common targets include:

• Web applications and APIs
• Mobile apps on iOS and Android
• Cloud environments and configurations
• Internal networks and endpoints
• Email and phishing resilience

What happens during the test

Testers first map what is exposed, then look for vulnerabilities, and finally try to exploit them safely to prove the real impact. Production systems are handled carefully, and any critical finding is reported straight away rather than waiting for the final report.

Reading the report

The report should rank each finding by risk, explain how it was found, show its business impact and give clear steps to fix it. A long list of low-risk issues is less useful than a short list of the problems that actually matter.

After the test

• Fix the highest-risk issues first.
• Retest to confirm the fixes work.
• Feed the lessons into development, for example with secure code reviews and DevSecOps checks.
• Test again after major releases or infrastructure changes.