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Which layer of the TCP/IP protocol model defines the IP…

Which layer of the TCP/IP protocol model defines the IP datagram and handles the routing of data across
networks?

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A.
Application layer

B.
Host-to-host transport layer

C.
Internet layer

D.
Network access layer

Explanation:
The Internet layer of the TCP/IP protocol handles the IP packets, the IP datagrams, and routes them through
the network.
Incorrect Answers:
A: The application layer includes protocols that support the applications. The application layer includes
protocols such as SMTP, HTTP, and FTP, but not the IP protocol.
B: The Host-to-host transport layer includes the TCP protocol, but not the IP protocol. The transport layer
provides end-to-end data transport services and establishes the logical connection between two communicating
computers.
D: The Network Access Layer defines how to use the network to transmit an IP datagram, but it does not define
or route the IP datagrams.
The Network Access Layer is the lowest layer of the TCP/IP protocol hierarchy. The protocols in this layer
provide the means for the system to deliver data to the other devices on a directly attached network.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 518


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