Which protocol is part of a system composed of a manager, agents, and an information database?

The correct answer, SNMP (Simple Network Management Protocol), is integral to network management systems that utilize a structured framework comprised of a manager, agents, and an information database.

In this context, the manager is typically a software application that communicates with various network devices, known as agents, which collect and report data about the device's status or performance. These agents manage the information stored in a Management Information Base (MIB), which serves as the database containing structured information about the device configurations and metrics.

This architecture enables centralized management of network devices, allowing for monitoring, configuration changes, and performance analysis. SNMP operates using a request-response model, where the manager sends requests to agents, and the agents respond with the requested information, or send notifications (traps) regarding significant events.

The other protocols mentioned do not fit this specific architecture. TCP/IP is a suite of protocols primarily used for data transmission across networks but does not define a management framework. ICMP is used for network diagnostics and error reporting, not for managing devices in a structured manner. HTTP is a protocol for transferring web pages and is not concerned with the specific roles of managers and agents in network management.