---
title: OSI Layer Model Explained for Access Server Networking
canonical: https://openvpn.net/as-docs/faq-osi-layer-model/
product: Access Server Docs
---

# OSI Layer Model Explained for Access Server Networking

**Question:** What is the OSI layer model?

**Answer:**

The OSI model describes network functions across seven layers. Access Server operates on Layer 3 (Network) by default, allowing routed traffic control. It can also operate in Layer 2 (Data Link) bridging mode if needed.

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Next: [Can I Reach VPN Clients from the Network?](https://openvpn.net/as-docs/faq-reach-vpn-clients-from-network.md)
Index: https://openvpn.net/as-docs/llms.txt