ccna 200-301 prerequisites

ccna 200-301 prerequisites.Set (set) an M old variable: the SNMP agent performs this function when the NMS issues a SetRequest-PDU.The SNMP agent changes the value of the MIB variable to the value specified by NMS. The SNMP agent affects the set request, which contains the new settings in the device.2.3.4.3 SNMP agent trapThe NMS uses get requests to periodically poll SNMP agents residing on managed devices by querying the device for data. In this process, a network management application can collect information to monitor traffic load and verify the configuration of the managed device. The information collected can be displayed in the NMS± through the GUI; average load, minimum load, and maximum load can be calculated; data can also be displayed graphically; and thresholds can be set so that a notification process is triggered when the thresholds are exceeded. For example, NMS can monitor the CPU utilization of Cisco routers. SNMP can also take periodic samples of values and display this information graphically for network administrators to use when creating baselines.Periodic SNMP polling also has disadvantages. First, there is a delay between the time an event occurs and the time that event is noticed (by polling) by the NMS. Second, there is also a tradeoff between polling frequency and loan utilization.To mitigate these disadvantages, you can have the SNMP agent generate and send trap messages to immediately notify the NMS when certain events occur that the trap message is an unsolicited message to alert the SNMP manager about a condition or event in the network. Examples of conditions where traps occur include, but are not limited to, incorrect user authentication, reboots, link status (up or down), MAC address tracking, shutdown of TCP connections, loss of connections to neighbors, and other significant events. Trap-oriented notifications reduce network and agent resource utilization by eliminating certain SNMP polling requests.The NMS software can send a text message to the network administrator, pop up a window, or turn the router's icon red in the NMSGUI.2.3.4.4 SNMP VulnerabilityIn any configuration, there must be at least one manager node running SNMP management software. Managed network devices (such as switches, routers, servers, and workstations) are required to have the SNMP agent software module installed. The SNMP agent is responsible for accessing the device's local MIB, which reflects the device's resources and the device's operation. The MIB stores data related to the operation of the device, which means that this data can be used to authenticate remote users.The SNMP manager can get (get) information from the agent and can modify or set (set) the agent's information. The set operation can modify configuration variables on the agent device and can also initiate certain operations on the device again. A reply to a set implies that the device has a new setting. For example, the set operation can cause the router to reboot, send a configuration file, or receive a configuration file.