Nokia Certified Network Associate (NCNA) — Question 61

The TCP/IP and OSI models of protocol are similar in that they both have:

Answer options

• A. An application and session layer.
• B. A network layer that provides a universal and consistent forwarding service.
• C. A transport layer with two protocols.
• D. An applications services layer with similar layering and service definitions.

Correct answer: C

Explanation

The correct answer is C because both the TCP/IP and OSI models have a transport layer that utilizes two protocols: TCP and UDP in TCP/IP, and TCP and SCTP in OSI. Options A, B, and D are incorrect as they either misrepresent the layers present in each model or the specific services they provide.