N10-005 · Question #817
Frame relay occurs at which of the following layers of the OSI model?
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
How the community answered
(41 responses)- A2% (1)
- B88% (36)
- C7% (3)
- D2% (1)
Why each option
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.
Layer 1 is the Physical layer, which deals with raw bit transmission over a medium, not framed WAN encapsulation.
Frame relay is a Data Link layer (Layer 2) protocol that uses virtual circuits to carry frames across a WAN. It provides framing, addressing via DLCIs (Data Link Connection Identifiers), and error detection at Layer 2 without performing Layer 3 routing or Layer 4 transport functions.
Layer 4 is the Transport layer, which handles end-to-end communication using protocols such as TCP and UDP, not WAN encapsulation.
Layer 6 is the Presentation layer, responsible for data formatting, encryption, and compression, not WAN framing.
Concept tested: Frame relay OSI layer classification
Source: https://www.cisco.com/c/en/us/tech/wan/frame-relay/index.html
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