Which option is an commonly used network layer protocol in an loT environment?

Question

Options

• ARPL
• BAQMP
• CMQTT
• DXMPP
• ECoAP

• A
  86% (19)
• C
  5% (1)
• E
  9% (2)

Explanation

RPL (Routing Protocol for Low-Power and Lossy Networks) is the correct answer because it operates at the network layer (OSI Layer 3), specifically designed for IPv6 routing in constrained IoT environments with limited power and unreliable links - exactly the conditions common in IoT deployments. It is standardized by the IETF (RFC 6550) and is the dominant routing protocol for low-power wireless IoT networks.

The distractors are all application layer (Layer 7) protocols, not network layer: MQTT is a lightweight publish-subscribe messaging protocol; CoAP is a RESTful protocol for constrained devices; XMPP is an XML-based messaging protocol; and AMQP (note: "AQMP" in the question appears to be a typo) is a message-queuing protocol for enterprise messaging.

Memory tip: Think "RPL Routes the Packets" - it's the only option that actually moves data between nodes in the network. The rest (MQTT, CoAP, XMPP, AMQP) are application protocols that use the network but don't build it. If you see a protocol that sounds like a router/routing protocol in an IoT context, it's almost certainly RPL.

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