CompTIA Network+ Practice Test

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What protocol operates at Layer 3 of the OSI model?

HTTP
TCP
IP
FTP

The correct answer is: IP

The Internet Protocol (IP) operates at Layer 3 of the OSI model, which is known as the Network layer. This layer is responsible for routing packets of data from the source to the destination across various networks. IP provides the means by which data can be sent between different devices on different networks, and it does so by including the addressing scheme that allows for the identification of devices on a network. In contrast, HTTP (Hypertext Transfer Protocol) operates at Layer 7 (Application Layer) and is used primarily for transferring web content. TCP (Transmission Control Protocol) operates at Layer 4 (Transport Layer) and is responsible for ensuring reliable data transmission, while FTP (File Transfer Protocol) also functions at Layer 7, allowing for the transfer of files between systems. Understanding that IP is the core protocol at the Network layer helps clarify its role in the OSI model and its significance in the overall functioning of network communications.