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11/07/2026 8:32 pm
TL;DR: The OSI model remains a useful security framework because attackers exploit weaknesses at multiple layers, from physical access through application-layer abuse, and the article argues that identity controls work better when they are aligned to where traffic is intercepted. That matters because application-layer MFA alone can leave lower-layer protocols and privileged access paths exposed.
NHIMG editorial — based on content published by Zero Networks: What Is the OSI Model and Why Is It Important? Exploring the 7 Layers
By the numbers:
- AiTM attacks have risen 146% in the last year.
Questions worth separating out
Q: How should security teams align MFA with network access paths?
A: Teams should align MFA with the layer where access is actually enforced, not only where users log in.
Q: Why do lower network layers still matter in identity security?
A: Lower network layers matter because they determine whether privileged systems are reachable before identity is fully checked.
Q: What breaks when organisations rely on MFA alone for digital interactions?
A: MFA can confirm the user once, but it does not automatically protect the active session or the transaction being approved later.
Practitioner guidance
- Map authentication to the actual access layer Inventory where authentication occurs for SaaS, SSH, RDP, SMB, VPN, and internal administrative tools.
- Review privileged protocols for default reachability Check whether privileged ports and management services are reachable before identity is validated.
- Align PAM with segmentation decisions Bring PAM owners into network design reviews so privilege policy and microsegmentation are defined together.
What's in the full article
Zero Networks' full article covers the operational detail this post intentionally leaves for the source:
- Layer-by-layer examples of common threats mapped to the OSI stack, including where each attack is most likely to surface.
- Detailed comparison of application-layer and network-layer MFA deployment patterns across SaaS, legacy, and admin access paths.
- Practical explanation of north-south, east-west, and up-down protection models for network defence.
- The vendor's own implementation framing for automated microsegmentation and Zero Trust network access.
👉 Read Zero Networks' analysis of the OSI model and network MFA placement →
OSI layers and network MFA: are your controls aligned correctly?
Explore further
11/07/2026 8:59 pm
Layer mismatch is the real governance problem: identity security fails when the control point and the access path do not match. Application-layer MFA can be sound while privileged transport paths remain open, which creates a governance illusion rather than a true boundary. Practitioners should treat layer placement as an identity design decision, not a networking afterthought.
A few things that frame the scale:
- 1.5 out of 10 organisations are highly confident in their ability to secure NHIs, compared to nearly 1 in 4 for securing human identities, according to The State of Non-Human Identity Security.
- 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, with 38% reporting no or low visibility and 47% reporting only partial visibility.
A question worth separating out:
Q: Who should own network-layer identity controls in an enterprise?
A: Ownership should be shared between IAM, PAM, and network security teams because the control spans authentication, segmentation, and access routing. If one team owns only the login experience, the other layers can drift out of policy. Clear joint ownership is what turns layered security into enforceable governance.
👉 Read our full editorial: OSI layers still shape identity-aware network security strategy
