Which OSI/ISO layer does a SOCKS server operate at?

The correct answer is A. Session layer. SOCKS (Socket Secure) is a proxy protocol that operates at Layer 5 - the Session layer - of the OSI model. It establishes, manages, and terminates sessions between a client and a destination server on behalf of the client. Because SOCKS works at the session layer, it is protocol-

Submitted by jaden.t· Apr 18, 2026Network and Communications Security

Question

Which OSI/ISO layer does a SOCKS server operate at?

Options

ASession layer
BTransport layer
CNetwork layer
DData link layer

How the community answered

(31 responses)

A
87% (27)
B
3% (1)
C
3% (1)
D
6% (2)

Explanation

SOCKS (Socket Secure) is a proxy protocol that operates at Layer 5 - the Session layer - of the OSI model. It establishes, manages, and terminates sessions between a client and a destination server on behalf of the client. Because SOCKS works at the session layer, it is protocol-agnostic and can proxy traffic for higher-layer protocols (HTTP, FTP, SMTP, etc.) without needing to understand them. This distinguishes it from application-layer proxies that must understand the specific application protocol, and from transport-layer mechanisms that work with raw TCP/UDP streams without session awareness.

Topics

#OSI Model#SOCKS Protocol#Proxy Servers#Session Layer

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