In the OSI model Segmentation and reassembly is the responsibility of?a.7th Layerb.6th Layerc.5th Layerd.4th laye

Break Down the Problem

1. Identify which layer of the OSI model is responsible for segmentation and reassembly in data communication.
2. Review the functions of each layer of the OSI model to determine which one handles segmentation and reassembly.

Relevant Concepts

• The OSI model has seven layers, which are:
  1. Application Layer (Layer 7)
  2. Presentation Layer (Layer 6)
  3. Session Layer (Layer 5)
  4. Transport Layer (Layer 4)
  5. Network Layer (Layer 3)
  6. Data Link Layer (Layer 2)
  7. Physical Layer (Layer 1)

Analysis and Detail

1. Layer Functions:
   • The Transport Layer (Layer 4) is responsible for ensuring proper data transfer between devices across a network, which includes segmenting the data into smaller packets for transmission and then reassembling them at the destination.
   • The other layers focus on different aspects of communication (e.g., application-level interactions, network routing, data formatting).

Verify and Summarize

After analyzing the roles of the OSI layers, it is clear that segmentation and reassembly are functions of the Transport Layer. Layers 5, 6, and 7 handle higher-level processes not directly related to the data's physical transport.

Final Answer

The correct answer is d. 4th Layer (Transport Layer).