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

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

View Answer

Answer: D

Explanation:

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 theWorld 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

VS.

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

Physical