CompTIA
N10-005 · Question #817
N10-005 Question #817: Real Exam Question with Answer & Explanation
The correct answer is B: Layer 2. Frame relay is a WAN data-link layer protocol that encapsulates data into frames for transmission across a packet-switched network. It operates exclusively at Layer 2 of the OSI model.
Question
Frame relay occurs at which of the following layers of the OSI model?
Options
- ALayer 1
- BLayer 2
- CLayer 4
- DLayer 6
Explanation
Frame relay is a WAN data-link layer protocol that encapsulates data into frames for transmission across a packet-switched network. It operates exclusively at Layer 2 of the OSI model.
Common mistakes.
- A. Layer 1 is the Physical layer, which deals with raw bit transmission over a medium, not framed WAN encapsulation.
- C. Layer 4 is the Transport layer, which handles end-to-end communication using protocols such as TCP and UDP, not WAN encapsulation.
- D. Layer 6 is the Presentation layer, responsible for data formatting, encryption, and compression, not WAN framing.
Concept tested. Frame relay OSI layer classification
Reference. https://www.cisco.com/c/en/us/tech/wan/frame-relay/index.html
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