Supporting Cisco Routing and Switching Network Devices (RSTECH, legacy) — Question 10

Which layer of the IOS model defines how data is formatted for transmission and how access to the physical media is controlled?

Answer options

• A. Physical
• B. Data link
• C. Network
• D. Transport

Correct answer: A

Explanation

The correct answer is A, Physical, as it focuses on the transmission of raw bits over a physical medium. The Data Link layer (B) is responsible for node-to-node data transfer and error detection, while the Network layer (C) handles routing and forwarding of packets. The Transport layer (D) ensures reliable data transfer between hosts but does not deal with physical transmission specifics.