Network security fundamentals
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How to design, use, and maintain secure networks.
Adapted edition
- Document type
- Reference Guide
- Format
- DOCX
- Pages
- 7
- Language
- English
- Version
- 1.0
- Updated
- 2026-09-16
- Category
- Information security
- Licence
- Open Government Licence v3.0
Description
How to design, use, and maintain secure networks for organisational planning, review and training. NCSC guidance is advisory and should be applied to the organisation's own risks and obligations.
Contents
- Note
- Identifying your Assets
- Do you know what assets your network is made up of?
- Further NCSC reading:
- Understanding the threat
- What threats do you need to be protected against?
- Further NCSC reading
- Restricting access
- How do you restrict access to your network to only the people and systems you want?
- Systems administration
- Passwords and PINS
- Allow lists and deny lists
- Certificates
- Designing network architecture
- Has security and resilience been designed into your network from the start?
- Network segmentation
- Source links
Source and licence
National Cyber Security Centre
AttributionNational Cyber Security Centre, “Network security fundamentals” (6 February 2025), reused under the Open Government Licence v3.0.
ChangesAdapted 16 September 2026: converted the official HTML article into neutral text-only DOCX and PDF editions. Preserved article headings, paragraphs, lists and plain-text source-link destinations; normalized web whitespace and typographic punctuation; omitted site navigation, topic and download cards, images, logos, scripts, styles and page furniture.
Version history
- v1.016/09/2026