CISSP · Question #286
At which layer of the Open Systems Interconnect (OSI) model are the source and destination address for a datagram handled?
The correct answer is C. Network Layer. The OSI Network Layer (Layer 3) is responsible for logical addressing and routing of datagrams between source and destination across networks.
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
How the community answered
(43 responses)- A5% (2)
- C93% (40)
- D2% (1)
Why each option
The OSI Network Layer (Layer 3) is responsible for logical addressing and routing of datagrams between source and destination across networks.
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.
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.
The Network Layer (Layer 3) handles logical addressing, including the source and destination IP addresses embedded in a datagram header. This layer is responsible for path determination and logical addressing that allows packets to be routed across interconnected networks from source to destination.
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
Source: https://learn.microsoft.com/en-us/windows-hardware/drivers/network/windows-network-architecture-and-the-osi-model
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