InJuniper Networks Mist AI Wireless, access points discover upstream switch and port information usingLink Layer Discovery Protocol (LLDP). LLDP is an IEEE-standard, vendor-neutral Layer 2 discovery protocol designed specifically to allow network devices to advertise and learn information about directly connected neighbors.
When a Juniper Mist AP connects to a wired switch, it uses LLDP to exchange information such as:
Switch hostname and chassis ID
Switch port identifier
VLAN details
Power over Ethernet (PoE) capabilities and power allocation
This information is critical for Mist operations and visibility. It enables the Mist cloud to accurately displayAP-to-switch mappings, identify theexact switch portan AP is connected to, validate PoE delivery, and assist with troubleshooting wired-side issues that impact wireless performance. LLDP data is also leveraged by Mist AI and Marvis to correlate wired and wireless events, improving root-cause analysis.
The other options are incorrect for the following reasons:
CDP (Cisco Discovery Protocol)is a Cisco-proprietary protocol and is not used by Juniper Mist APs for switch discovery.
ARP (Address Resolution Protocol)resolves IP addresses to MAC addresses and does not provide device or port identity information.
SNMPis a management and monitoring protocol used by controllers or management systems, not by APs for neighbor discovery.
Because LLDP is standards-based, lightweight, and designed for neighbor discovery, it is the correct and supported protocol used by Juniper Mist APs to learn switch information.
Therefore, the correct answer isD. LLDP.
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