单项选择题
A. It uses SNMP v1.
B. It scans devices for hardware information.
C. It scans and records the operational status of devices.
D. When the configuration of a device changes, the inventory is automatically updated.
多项选择题 Which two characteristics are true of a firewall running in routed mode based on the following information?（）
多项选择题 Which three things can be restricted by the Class of Service in a traditional PBX?（）
单项选择题 Distribution layer: This layer includes LAN-based routers and layer 3 switches . When is a first-hop redundancy protocol needed in the distribution layer?（）