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Glossary

Network layers

Below is a list of the different layers that makes up the open systems interconnection (OSI) model and the associated Cloudflare products.

Network layer	Protocol and related products
7 Application layer	HTTP, DNS Authoritative DNS, CDN, Cloudflare Tunnel, Stream, Load Balancing, WAF, Bot Management
6 Presentation layer
5 Session layer
4 Transport layer	TCP/UDP Spectrum, Argo Smart Routing, Load Balancing
3 Network layer	IP, GRE, any packet/protocol Magic Transit, Magic Firewall, Magic WAN
2 Datalink layer	Direct connection Cloudflare Network Interconnect (CNI)
1 Physical layer	Direct connection Cloudflare Network Interconnect (CNI)