The Simple Network Management Protocol (SNMP)is an （）protocol that facilitates the exchange of management information between （） . It is part of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. SNMP enables network （） to manage network performance, find and sole network problems, and plan for （） . An SNMP-man-aged network consists of three key components: managed devices, （） , and network-management systems.
The Simple Network Management Protocol (SNMP)is an （）
A．Physical Layer
B．Link Layer
C．Network Layer
D．Transport Layer
