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PCCET · Question #143
PCCET Question #143: Real Exam Question with Answer & Explanation
UDP is a core TCP/IP sub-protocol that operates at Layer 4 (the Transport Layer) of the OSI model, responsible for connectionless data delivery between applications.
Submitted by mike_84· Apr 18, 2026
Question
Which TCP/IP sub-protocol operates at Layer4 of the OSI model?
Options
- AHTTPS
- BFTP
- CUDP
- DSSH
Explanation
UDP is a core TCP/IP sub-protocol that operates at Layer 4 (the Transport Layer) of the OSI model, responsible for connectionless data delivery between applications.
Common mistakes.
- A. HTTPS (Hypertext Transfer Protocol Secure) operates at Layer 7 (Application Layer) and uses TCP for its underlying transport.
- B. FTP (File Transfer Protocol) operates at Layer 7 (Application Layer) and relies on TCP for reliable data transfer.
- D. SSH (Secure Shell) operates at Layer 7 (Application Layer) and uses TCP to establish a secure channel for remote access.
Concept tested. OSI model layers (Transport Layer protocols)
Reference. https://learn.microsoft.com/en-us/windows/win32/winsock/the-osi-model-and-tcp-ip-protocol-suite
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