MCQ Detailed View

The addressing scheme used at the Network Layer of the OSI model is the IP address.

The Network Layer (Layer 3) is responsible for logical addressing and routing of data. IP addresses identify each device on a network uniquely and help in delivering data packets across different networks.

Why IP addresses are used:

• Logical addressing: Unlike MAC addresses (which are physical), IP addresses can change and are assigned based on location within a network.


• Routing: Routers use IP addresses to decide the best path for data to travel.


• Global identification: Each IP address is unique on the internet or within a local network.

To clarify the options:

• Port numbers are used at the Transport Layer.


• MAC addresses belong to the Data Link Layer.


• Domain names are used at the Application Layer and resolved via DNS.

Conclusion: The correct addressing scheme at the Network Layer is the IP address. It plays a crucial role in identifying devices and routing packets across networks, making it essential in both local and internet communication.