Which two mechanisms does Cisco EnergyWise use for neighbor discovery? (Choose two.)
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A. B. C. D. E.CD.
Cisco EnergyWise Neighbor Discovery Process The Cisco EnergyWise neighbor discovery process is the mechanism by which domain members discover each other and populate their Cisco EnergyWise neighbor tables.
Cisco EnergyWise queries can subsequently be distributed to all domain members using the neighbor relationships to monitor and control the power usage of devices within a domain.
Cisco EnergyWise domain members automatically discover their neighbors through one of two mechanisms: UDP broadcast packets are automatically sent out switch ports which support Cisco EnergyWise, regardless of whether the interfaces are configured with the no energywise interface-level command.
CDP packets are sent when CDP is configured for the switch ports.
References: http://www.cisco.com/en/US/docs/solutions/Enterprise/Borderless_Networks/Energy_Management/energywisedg.html? referring_site=smartnavRD#wp555927
Cisco EnergyWise is a network protocol developed by Cisco Systems that allows network administrators to monitor and control the power usage of network devices. The protocol operates on the application layer of the OSI model, and it relies on several underlying mechanisms for network discovery and communication.
To discover and communicate with other EnergyWise-enabled devices in the network, Cisco EnergyWise uses two primary mechanisms: multicast and LLDP-MED. Let's take a closer look at each of these mechanisms:
Multicast: Cisco EnergyWise uses IP multicast to discover other EnergyWise-enabled devices on the network. Multicast allows a single packet to be sent to multiple devices at once, without requiring the sender to send a separate packet to each recipient. In EnergyWise, multicast packets are sent to the IP multicast address 239.255.255.250. When an EnergyWise device receives a multicast packet, it can determine if the packet contains EnergyWise information by examining the packet header.
LLDP-MED: Link Layer Discovery Protocol-Media Endpoint Discovery (LLDP-MED) is a network protocol used to exchange information about network devices between adjacent devices on a network. LLDP-MED can be used by EnergyWise to discover other EnergyWise-enabled devices on the same network segment. LLDP-MED packets contain information such as device type, device capabilities, and device location. When an EnergyWise device receives an LLDP-MED packet, it can use the information in the packet to determine if the device is EnergyWise-enabled.
UDP broadcast, Cisco Discovery Protocol, and TCP are not used by Cisco EnergyWise for neighbor discovery. UDP broadcast is a network communication method that sends a message to all devices on a network segment. Cisco Discovery Protocol (CDP) is a proprietary protocol developed by Cisco Systems that is used to discover other Cisco devices on a network. TCP is a transport layer protocol that is used for reliable communication between applications, but it is not used by EnergyWise for neighbor discovery.
In summary, the two mechanisms that Cisco EnergyWise uses for neighbor discovery are multicast and LLDP-MED. These mechanisms allow EnergyWise-enabled devices to discover and communicate with each other on the network, which enables network administrators to monitor and control the power usage of network devices.