CCNA: Cisco Certified Network Associate — Question 1319

What is the primary function of a Layer 3 device?

Answer options

• A. to transmit wireless traffic between hosts
• B. to analyze traffic and drop unauthorized traffic from the Internet
• C. to forward traffic within the same broadcast domain
• D. to pass traffic between different networks

Correct answer: D

Explanation

The correct answer is D because Layer 3 devices, such as routers, are designed to route traffic between different networks. Options A, B, and C refer to functionalities that are not primarily associated with Layer 3 devices, as they either involve wireless transmission, traffic analysis, or forwarding within the same broadcast domain, which is not their main function.