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American retail corporation Walmart has been the world's largest company by revenue since 2014. [1] The list is limited to the largest 50 companies, all of which have annual revenues exceeding US$130 billion. This list is incomplete, as not all companies disclose their information to the media and/or general public. [3]
Wikipedia is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the wiki software MediaWiki.Wikipedia is the largest and most-read reference work in history, and is consistently ranked among the ten most visited websites; as of April 2024, it was ranked fourth by Semrush, and seventh by Similarweb.
Gmail is the email service provided by Google. As of 2019,[update] it had 1.5 billion active users worldwide, making it the largest email service in the world.[1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party ...
Google is also the largest search engine, mapping and navigation application, email provider, office suite, online video platform, photo and cloud storage provider, mobile operating system, web browser, machine learning framework, and AI virtual assistant provider in the world as measured by market share. [18]
- Overview and Basic Concepts
- Management Information Base
- Protocol Details
- Protocol Versions
- Implementation Issues
- Security Implications
- RFC References
- See Also
- Further Reading
In typical uses of SNMP, one or more administrative computers called managers have the task of monitoring or managing a group of hosts or devices on a computer network. Each managed system executes a software component called an agentwhich reports information via SNMP to the manager. An SNMP-managed network consists of three key components: 1. Mana...
SNMP agents expose management data on the managed systems as variables. The protocol also permits active management tasks, such as configuration changes, through remote modification of these variables. The variables accessible via SNMP are organized in hierarchies. SNMP itself does not define which variables a managed system should offer. Rather, S...
SNMP operates in the application layer of the Internet protocol suite. All SNMP messages are transported via User Datagram Protocol (UDP). The SNMP agent receives requests on UDP port 161. The manager may send requests from any available source port to port 161 in the agent. The agent response is sent back to the source port on the manager. The man...
In practice, SNMP implementations often support multiple versions: typically SNMPv1, SNMPv2c, and SNMPv3.
SNMP's powerful write capabilities, which would allow the configuration of network devices, are not being fully utilized by many vendors, partly because of a lack of security in SNMP versions before SNMPv3, and partly because many devices simply are not capable of being configured via individual MIB object changes. Some SNMP values (especially tabu...
Using SNMP to attack a network
Because SNMP is designed to allow administrators to monitor and configure network devices remotely it can also be used to penetrate a network. A significant number of software tools can scan the entire network using SNMP, therefore mistakes in the configuration of the read-write mode can make a network susceptible to attacks.: 52 In 2001, Cisco released information that indicated that, even in read-only mode, the SNMP implementation of Cisco IOS is vulnerable to certain denial of serviceattac...
Authentication
SNMP is available in different versions, each has its own security issues. SNMP v1 sends passwords in plaintext over the network. Therefore, passwords can be read with packet sniffing. SNMP v2 allows password hashing with MD5, but this has to be configured. Virtually all network management software support SNMP v1, but not necessarily SNMP v2 or v3. SNMP v2 was specifically developed to provide data security, that is authentication, privacy and authorization, but only SNMP version 2c gained t...
RFC 1155 (STD 16) — Structure and Identification of Management Information for the TCP/IP-based InternetsRFC 1156 (Historic) — Management Information Base for Network Management of TCP/IP-based internetsRFC 1157 (Historic) — A Simple Network Management Protocol (SNMP)RFC 1213 (STD 17) — Management Information Base for Network Management of TCP/IP-based internets: MIB-IIDouglas Mauro; Kevin Schmidt (2005). Essential SNMP (Second ed.). O'Reilly Media. ISBN 978-0596008406.William Stallings (1999). SNMP, SNMPv2, SNMPv3, and RMON 1 and 2. Addison Wesley Longman, Inc. ISBN 978-0201485349.Marshall T. Rose (1996). The Simple Book. Prentice Hall. ISBN 0-13-451659-1.Microsoft Corporation is an American multinational corporation and technology company headquartered in Redmond, Washington.[2] Microsoft's best-known software products are the Windows line of operating systems, the Microsoft 365 suite of productivity applications, and the Edge web browser. Its flagship hardware products are the Xbox video game ...
Four UN members (Cuba, Liechtenstein, Monaco and North Korea) do not belong to the IMF hence their economies are not ranked below. Kosovo, despite not being a member of the United Nations, is a member of IMF. Taiwan is not a IMF member but it is still listed in the official IMF indices. Several leading GDP-per-capita (nominal) jurisdictions may ...
