Which layer is described as 'Provides unique addressing for transmission across different networks (e.g., IP)'?

Which layer is described as 'Provides unique addressing for transmission across different networks (e.g., IP)'?

• A. 7 - Application
• B. 6 - Presentation
• C. 3 - Network
• D. 4 - Transport

Answer: (C)

The network layer handles unique addressing and routing across different networks. It uses logical addresses, like IP addresses, so a packet can be identified and delivered from a source host to a destination host no matter how many networks lie between them. Routers operate at this layer to forward packets toward their destination using routing tables and protocols. In contrast, the transport layer focuses on end-to-end delivery and reliability, not cross-network addressing, while the presentation and application layers deal with data formatting and user-facing services, not routing between networks.

The network layer handles unique addressing and routing across different networks. It uses logical addresses, like IP addresses, so a packet can be identified and delivered from a source host to a destination host no matter how many networks lie between them. Routers operate at this layer to forward packets toward their destination using routing tables and protocols. In contrast, the transport layer focuses on end-to-end delivery and reliability, not cross-network addressing, while the presentation and application layers deal with data formatting and user-facing services, not routing between networks.