CISSP Question #286: Real Exam Question with Answer & Explanation

Question

At which layer of the Open Systems Interconnect (OSI) model are the source and destination address for a datagram handled?

Options

• ATransport Layer
• BData-Link Layer
• CNetwork Layer
• DApplication Layer

Explanation

The OSI Network Layer (Layer 3) is responsible for logical addressing and routing of datagrams between source and destination across networks.

Common mistakes.

• A. The Transport Layer (Layer 4) handles end-to-end communication, segmentation, and port numbers (e.g., TCP/UDP), not the logical source and destination IP addresses of a datagram.
• B. The Data-Link Layer (Layer 2) handles physical MAC addresses used for node-to-node delivery on the same local network segment, not the logical IP addresses used in datagram routing.
• D. The Application Layer (Layer 7) provides network services directly to end-user applications such as HTTP or FTP, and has no role in handling source or destination addressing for datagrams.

Concept tested. OSI Layer 3 logical addressing and datagram routing

Reference. https://learn.microsoft.com/en-us/windows-hardware/drivers/network/windows-network-architecture-and-the-osi-model

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