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Autonomous System (AS)

Knowledge Base/Glossary: "An Autonomous System (AS) is a collection of interconnected networks and routers that are operated under a single administrative domain. An AS is assigned a unique identifier known as an Autonomous System Number (ASN), which is used to identify it..."

An Autonomous System (AS) is a collection of interconnected networks and routers that are operated under a single administrative domain. An AS is assigned a unique identifier known as an Autonomous System Number (ASN), which is used to identify it on the internet. The purpose of an AS is to facilitate the routing of traffic between different networks, both within and between organizations. ASs are an essential component of the internet infrastructure and enable global connectivity and communication.

Each AS has its own routing policy, which determines how traffic is routed through the network. This policy can be used to prioritize certain types of traffic, ensure efficient use of network resources, and protect against security threats such as denial-of-service attacks. Routing policies are typically implemented using routing protocols such as Border Gateway Protocol (BGP), which allow ASs to exchange routing information and make routing decisions.

ASs are used in a variety of settings, from small networks within a single organization to large-scale networks spanning multiple organizations and countries. Internet Service Providers (ISPs) are an example of organizations that operate ASs, as they provide connectivity to customers and need to route traffic between different networks. Large enterprises and government agencies may also operate ASs to manage their own internal networks and connect to external networks.

One of the key benefits of ASs is their ability to provide fault tolerance and redundancy. By distributing traffic across multiple networks and routers, ASs can ensure that traffic can still be routed even if certain parts of the network fail. This is particularly important for critical applications and services that require high levels of availability and reliability.

In summary, an Autonomous System (AS) is a collection of interconnected networks and routers that are operated under a single administrative domain. ASs are used to facilitate the routing of traffic between different networks and enable global connectivity and communication. Each AS has its own routing policy, which determines how traffic is routed through the network. ASs are used in a variety of settings, from small networks within a single organization to large-scale networks spanning multiple organizations and countries. They provide fault tolerance and redundancy, which is important for ensuring the availability and reliability of critical applications and services.

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