Diagrams / Network Security

Network Layers Diagram

A layered model of the OSI stack with attack references, useful for grounding network-security content.

OSI Model - Click layers to explore

7 LAYERS

Application

HTTP • HTTPS • SSH • FTP • DNS • SMTP

Attacks:4

Presentation

SSL/TLS • JPEG • ASCII • MIME

Attacks:3

Session

NetBIOS • RPC • SMB • SOCKS

Attacks:3

Transport

TCP • UDP • SCTP

Attacks:3

Network

IP • ICMP • IPSec • IGMP

Attacks:3

Data Link

Ethernet • ARP • Wi-Fi • PPP

Attacks:3

Physical

Cables • Hubs • Repeaters • Radio

Attacks:3

L5-7: Application Layers

L4: Transport Layer

L3: Network Layer

L2: Data Link Layer

L1: Physical Layer

🔴 Red ports = High-value targets

🟡 Yellow ports = Common services

🟢 Green ports = Encrypted/Secure

🟣 Purple ports = Auth-critical