You are deploying IP phones in your enterprise networks. When plugged in, the IP phones must automatically negotiate the power requirements for the new connection with the EX Series switches.
In this scenario, which protocol should be used to enable this behavior?
LLDP-MED (Link Layer Discovery Protocol - Media Endpoint Discovery) is the protocol designed to automatically negotiate power requirements and exchange relevant information for IP telephony, including power negotiation, between network devices such as switches and IP phones. While LLDP provides basic discovery capabilities, LLDP-MED extends these capabilities specifically for media endpoint devices like IP phones, making it the correct protocol for this scenario.
should be C
C is correct
I will go with D. {master:0}[edit protocols lldp] root@vQFXRE2# show interface all; interface xe-0/0/1 { power-negotiation; } LLDP and LLDP-MED also provide PoE power management capabilities. LLDP power negotiation allows the switch to manage PoE power by negotiating with LLDP-enabled powered devices to dynamically allocate PoE power as needed. LLDP power priority allows an LLDP-enabled powered device to set the PoE power priority on the switch interface to which it connects. https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/device-discovery-using-lldp-lldp-med.html#d146e357 https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/device-discovery-using-lldp-lldp-med.html#id-understanding-lldp-and-lldp-med-on-ex-series-switches.
LLDP-MED goes one step further than LLDP, exchanging IP-telephony messages between the switch and the IP telephone.