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Designing the Switch/Router
Published in James Aweya, Designing Switch/Routers, 2023
An MIB is a group of managed objects that are stored in a virtual database in a managed device. The MIB is a repository for information about network performance and device parameters. The value of an MIB object can be retrieved or changed using SNMP commands, usually through a GUI-based NMS. The SNMP agent can receive MIB-related queries from the NMS, and then respond with the appropriate information. The SNMP manager can request or change the value of any of the MIB variables the SNMP agent contains. The SNMP manager can get a value from the SNMP agent or store a value in the agent’s MIB. The SNMP agent gathers data from the MIB, and can also respond to requests sent by the SNMP manager to get or set data. The SNMP agent can also send unsolicited SNMP traps to the SNMP manager. SNMP traps are messages sent by the agent to alert the SNMP manager to a condition on the device and network. An SNMP trap can indicate link status (up or down), improper user authentication, restarts, loss of connection to a neighbor router, or closing of a BGP TCP connection.
A Survey on Distributed Denial of Service Attack Detection
Published in Amit Kumar Tyagi, Ajith Abraham, A. Kaklauskas, N. Sreenath, Gillala Rekha, Shaveta Malik, Security and Privacy-Preserving Techniques in Wireless Robotics, 2022
SNMP stands for Simple Network Management Protocol, and is used to monitor or manage the network-connected devices. SNMP has two major components: one is manager and another is an agent. Management of network is the interaction between the manager and host. A manager is a host that controls and monitors the agent such as the router. In the application layer the manager can monitor and control different agents, i.e., few managers handle sets of agents. In general, management with SNMP has basic three components: 1. The manager checks the behavior of the agent by requesting information; 2. Resetting the values on the agent database and forcing the agent to evaluate certain functions; 3. The manager gets a warning from the agent about the unusual condition.
Systems Management and Monitoring
Published in Al Kovalick, Video Systems in an IT Environment, 2013
There are three versions of SNMP: SNMPv1 (RFC 1155), SNMPv2C, and SNMPv3, each in turn with more functionality. SNMPv1 and SNMPv2C define administrative relationships between SNMP entities called communities. Communities group SNMP agents that have similar access restrictions with the management entities that meet those restrictions. All entities that are in a community share the same community name. To prove you are part of a community, access is tested against the community name during the SNMP dialog. SNMPv3 defines the secure version of the SNMP protocol.
Virtualised Environment for Learning SDN-based Networking
Published in IETE Journal of Education, 2020
Oscar Polanco, Fabio G. Guerrero
The functionality of the control plane in the layers two and three of the OSI (Open System Interconnection) model determines the treatment given to packets on their path from their origin to destination. This task is performed, for instance, by the STP (Spanning Tree Protocol) in layer 2 and by routing protocols such as OSPF (Open Shortest Path First) and BGP (Border Gateway Protocol) in layer 3, which works on the principle of distributed control. In a majority of networking equipment, high level management policies are traditionally programmed through low-level commands, and are specific to each manufacturer. While the SNMP (Simple Network Management Protocol) protocol is helpful in monitoring and configuring equipment using this traditional method, it is neither possible nor easy to flexibly handle high-level routing policies.
Smart building energy management based on network occupancy sensing
Published in Journal of International Council on Electrical Engineering, 2018
Xianing Jin, Guanqun Wang, Yi Song, Chongbo Sun
Type II sensor includes the addition of software to existing infrastructure to make existing occupancy related data available. The most widely used type II sensor is Wi-Fi devices. Wi-Fi can be used to locate occupants in a building where software on user hosts report all the available APs and their respective signal strengths. Another indication of occupancy is keyboard and mouse use. Operating systems provide functions to detect input activity but additional software is needed to collect this activity and make it available remotely. This information is made available remotely using the Simple Network Management Protocol (SNMP). SNMP provides a standard way to centrally gather the information recorded by the PC Activity Monitor on various computers. Since employees always spend most of their time in their private office where their PCs are located, monitoring computer activity would be a good predictor of total building occupancy.
Fast data acquisition algorithm for remote monitoring system of smart home
Published in International Journal of Computers and Applications, 2022
The variables that are directly defined in the remote monitoring system of smart home are only the list of the original data, which cannot directly reflect the characteristics of the monitored equipment. If the first domain uses Simple Network Management Protocol to directly access monitoring equipment to obtain data, and transmits a large number of unprocessed data in the Internet of things, it will take up too much network bandwidth, affect network background traffic, and there will be large transmission delay, resulting in data management lack of timeliness, which cannot reflect the real situation.