Question 6 of 250 from exam 400-201: Cisco CCIE Service Provider Written Exam

Question 6 of 250 from exam 400-201: Cisco CCIE Service Provider Written Exam


Which two options are considered nodes in Low-power Lossy Networks? (Choose two.)



A. B. C. D. E.


Low-power Lossy Networks (LLNs) are a type of wireless network that is specifically designed for low-power and lossy environments, such as smart homes, industrial automation, and environmental monitoring. These networks typically consist of numerous constrained devices, such as sensors and actuators, that have limited processing power, memory, and energy resources. The LLNs are characterized by their ability to operate in harsh and challenging environments and their support for multiple communication protocols and technologies.

In LLNs, nodes are devices that can communicate with each other using a common networking protocol. Here are the two options that are considered nodes in Low-power Lossy Networks:

  1. Sensors: Sensors are devices that can detect and measure physical phenomena, such as temperature, humidity, pressure, and motion. They are often deployed in large numbers in LLNs and can communicate with other devices using short-range wireless technologies, such as ZigBee, 6LoWPAN, and Bluetooth Low Energy. Sensors can be powered by batteries or energy harvesting techniques, and they can operate for long periods without maintenance.

  2. Routers: Routers are devices that are responsible for forwarding packets between different nodes in the network. In LLNs, routers are often low-power and have limited processing and memory capabilities. They use routing protocols that are specifically designed for LLNs, such as RPL (Routing Protocol for Low-power and Lossy Networks), which can adapt to changing network topologies, manage network resources efficiently, and minimize energy consumption.

Access points, controllers, and servers are not typically considered nodes in Low-power Lossy Networks. Access points are devices that provide wireless access to a wired network, such as Wi-Fi access points, and are not optimized for low-power and lossy environments. Controllers are devices that manage and monitor network resources, such as wireless controllers, and are not involved in the data forwarding process. Servers are devices that provide services to other devices in the network, such as web servers or database servers, and are not directly involved in the communication between nodes in the LLNs.