Cisco 100-105 Exam

Which layer of the TCP/IP stack combines the OSI model physical and data link layers?

  • A. Internet layer
  • B. transport layer
  • C. application layer
  • D. network access layer
Answer: Option D.

The Internet Protocol Suite, TCP/IP, is a suite of protocols used for communication over the internet. The TCP/IP model was created after the OSI 7 layer model for two major reasons. First, the foundation of the Internet was built using the TCP/IP suite and through the spread of the World Wide Web and Internet, TCP/IP has been preferred. Second, a project researched by the Department of Defense (DOD) consisted of creating the TCP/IP protocols. The DOD’s goal was to bring international standards which could not be met by the OSI model. Since the DOD was the largest software consumer and they preferred the TCP/IP suite, most vendors used this model rather then the OSI. Below is a side by side comparison of the TCP/IP and OSI models.

TCP/IP Model –

OSI Model Application Layer 7 –

Application –

Layer 6 –

Presentation –

Layer 5 –

Session Transport Layer 4 –

Transport Internet Layer 3 –

Network Network Access Layer 2 –

Data Link –

Layer 1 –

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