The source MAC address is added to a PDU (Protocol Data Unit) during the encapsulation process at the Data Link layer. This is the second layer of the OSI (Open Systems Interconnection) model. Here's a step-by-step explanation:

1. When a device sends data to another device on a network, it must go through a process called encapsulation. This process involves adding control information as it passes through the layered model.

2. The top three layers (Application, Presentation, and Session—Layers 7, 6, and 5) deal with application issues and generally are implemented only in software. The highest layer, the application layer, is closest to the end user.

3. The lower four layers (Transport, Network, Data Link, and Physical—Layers 4, 3, 2, and 1) provide network services to the applications. The physical layer and data link layer are implemented by hardware and software.

4. The data link layer (Layer 2) is responsible for the encoding and decoding of data into bits and allows for data to be transferred between devices on the same network.

5. During the encapsulation process at the data link layer, a frame header is added to the data. This frame header contains control information, including the source and destination MAC addresses.

6. The MAC (Media Access Control) address is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment.

7. The source MAC address is the MAC address of the device sending the data. This is added to the frame header during the encapsulation process at the data link layer.

8. The encapsulated data is then sent over the physical layer (Layer 1) to the receiving device.

Question

The source MAC address is added to a PDU (Protocol Data Unit) during the encapsulation process at the Data Link layer. This is the second layer of the OSI (Open Systems Interconnection) model. Here's a step-by-step explanation:

1. When a device sends data to another device on a network, it must go through a process called encapsulation. This process involves adding control information as it passes through the layered model.

2. The top three layers (Application, Presentation, and Session—Layers 7, 6, and 5) deal with application issues and generally are implemented only in software. The highest layer, the application layer, is closest to the end user.

3. The lower four layers (Transport, Network, Data Link, and Physical—Layers 4, 3, 2, and 1) provide network services to the applications. The physical layer and data link layer are implemented by hardware and software.

4. The data link layer (Layer 2) is responsible for the encoding and decoding of data into bits and allows for data to be transferred between devices on the same network.

5. During the encapsulation process at the data link layer, a frame header is added to the data. This frame header contains control information, including the source and destination MAC addresses.

6. The MAC (Media Access Control) address is a unique identifier assigned to a network interface controller (NIC) for use as a network address in communications within a network segment.

7. The source MAC address is the MAC address of the device sending the data. This is added to the frame header during the encapsulation process at the data link layer.

8. The encapsulated data is then sent over the physical layer (Layer 1) to the receiving device.

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