N10-005 · Question #690
Which of the following exist at layer three of the OSI model? (Select TWO).
The correct answer is D. Packet E. Router. Layer 3 is the Network layer of the OSI model. The Protocol Data Unit (PDU) at Layer 3 is the packet, which contains source and destination IP addresses. Routers operate at Layer 3 because they make forwarding decisions based on IP addresses. NICs and cables exist at Layer 1…
Question
Which of the following exist at layer three of the OSI model? (Select TWO).
Options
- ANIC
- BSwitch
- CFrame
- DPacket
- ERouter
- FCable
How the community answered
(47 responses)- A6% (3)
- B2% (1)
- C2% (1)
- D87% (41)
- F2% (1)
Explanation
Layer 3 is the Network layer of the OSI model. The Protocol Data Unit (PDU) at Layer 3 is the packet, which contains source and destination IP addresses. Routers operate at Layer 3 because they make forwarding decisions based on IP addresses. NICs and cables exist at Layer 1 (Physical), switches and frames exist at Layer 2 (Data Link). Understanding which PDU and device belong to each OSI layer is a foundational networking concept.
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