The TCP/IP Network Interface Layer is also known as the

• A. Internet Layer
• B. Application Layer
• C. Link Layer
• D. Transport Layer

Answer: (C)

In the TCP/IP model, the Network Interface Layer covers how data actually travels over the local network and how devices on that network are addressed. It combines the responsibilities of the OSI Data Link and Physical layers and is commonly called the Link Layer in TCP/IP. This layer includes hardware addressing (MAC addresses), framing, and the methods used to access the local network medium (like Ethernet or Wi‑Fi). It also handles how the local network maps IP addresses to hardware addresses (ARP is a part of how this works on the local segment). The other layers have different roles: the Internet Layer handles routing between networks with IP, the Transport Layer handles end-to-end communication with TCP/UDP, and the Application Layer deals with software protocols used by applications. So, the TCP/IP Network Interface Layer is known as the Link Layer.