CISSP · Question #1260
Which Open Systems Interconnection (OSI) layer(s) BEST corresponds to the network access layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model?
The correct answer is B. Data Link and Physical Layers. The TCP/IP model's network access layer maps to the OSI model's Data Link and Physical layers, both handling hardware-level framing, MAC addressing, and bit transmission.
Question
Options
- ATransport Layer
- BData Link and Physical Layers
- CApplication, Presentation, and Session Layers
- DSession and Network Layers
How the community answered
(35 responses)- A6% (2)
- B91% (32)
- C3% (1)
Why each option
The TCP/IP model's network access layer maps to the OSI model's Data Link and Physical layers, both handling hardware-level framing, MAC addressing, and bit transmission.
The OSI Transport layer (Layer 4) maps to the TCP/IP transport layer, not the network access layer, as it handles end-to-end communication via TCP and UDP.
The TCP/IP network access layer (also called the link layer) encompasses the functions of both the OSI Data Link layer (Layer 2) and the OSI Physical layer (Layer 1). The Data Link layer handles framing, MAC addressing, and error detection, while the Physical layer manages the actual transmission of raw bits over a physical medium - together these correspond to what TCP/IP consolidates into its single network access layer.
The OSI Application, Presentation, and Session layers (Layers 7, 6, and 5) collectively map to the TCP/IP application layer, not the network access layer.
The OSI Session layer (Layer 5) maps to the TCP/IP application layer, and the OSI Network layer (Layer 3) maps to the TCP/IP internet layer - neither corresponds to the network access layer.
Concept tested: TCP/IP to OSI layer mapping correspondence
Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/nic-teaming/nic-teaming
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