SNMP is used as a northbound and southbound protocol for the SD-WAN controller to exchange device information and faults.

• A. Simple Network Management Protocol(SNMP)
• B. Simple Network Protocol(SNMP)
• C. Simple Network Message Protocol(SNMP)
• D. Simple Network Messaging Protocol(SNMP)

Answer: (D)

SNMP is a network management protocol that allows a central controller to query devices for status, configuration, and performance data, and to receive asynchronous fault notifications. In SD-WAN, this protocol supports both directions of communication: it helps the controller pull device information and fault details from devices (southbound) and relay that information to management or analytics components (northbound). The standard acronym for SNMP is Simple Network Management Protocol, which captures its role in managing network elements. The other phrasings change this meaning by replacing “Management” with “Protocol,” “Message,” or “Messaging,” which don’t reflect the established term. In practice, SNMP uses MIBs to organize data, supports polling operations and traps, and is often implemented with SNMPv3 for better security.