N10-005 Question #522: Real Exam Question with Answer & Explanation

The correct answer is B. Layers 2 and 3. A multi-layer switch operates at both OSI Layer 2 (Data Link) for frame-based switching and Layer 3 (Network) for IP-based routing, combining both functions in a single device. Layers above or below these are not relevant to multi-layer switch operation.

Networking concepts

Question

A multi-layer switch operates at which of the following OSI layers?

Options

ALayers 1 and 5
BLayers 2 and 3
CLayers 4 and 5
DLayers 5 and 6

Explanation

A multi-layer switch operates at both OSI Layer 2 (Data Link) for frame-based switching and Layer 3 (Network) for IP-based routing, combining both functions in a single device. Layers above or below these are not relevant to multi-layer switch operation.

Common mistakes.

A. Layer 1 is the Physical layer (cables, signals) and Layer 5 is the Session layer - neither relates to the forwarding or routing functions of a multi-layer switch.
C. Layer 4 is the Transport layer (TCP/UDP) and Layer 5 is the Session layer - while some advanced switches can inspect Layer 4 headers, the defining layers of a multi-layer switch are 2 and 3.
D. Layer 5 is the Session layer and Layer 6 is the Presentation layer - these application-oriented layers have no involvement in switch forwarding or routing operations.

Concept tested. Multi-layer switch OSI layer operation

Reference. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/10584-layer3-switches.html

Topics

#multi-layer switch#OSI model#Layer 2#Layer 3

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