AUTONOMOUS SYSTEM NUMBER Meaning and
Definition
-
An Autonomous System Number (ASN) refers to a unique numerical identifier assigned to an Autonomous System (AS) in the context of computer networking and the Internet. An AS is a collection of network routers that are under the administrative control of a single organization or entity that operates as a separate network entity within the larger Internet infrastructure.
The ASN serves as the globally recognized identity for an AS and is crucial for network communication and coordination. Assigned by Internet Assigned Numbers Authority (IANA) or Regional Internet Registries (RIRs), ASNs are typically represented as 16-bit values, known as 2-byte ASNs, or 32-bit values, called 4-byte ASNs, depending on the version of the Border Gateway Protocol (BGP) used.
ASNs play a fundamental role in facilitating traffic routing between various ASs. BGP uses ASN-based routing to exchange network reachability information between ASs, enabling efficient and effective data transmission across different autonomous systems. ASNs aid in maintaining network stability, enhancing security, and optimizing network performance as they allow network administrators to establish routing policies and control the inbound and outbound traffic flow.
In summary, an Autonomous System Number (ASN) is a unique numerical identifier assigned to an Autonomous System (AS) that acts as an integral part of the Internet infrastructure, facilitating routing, communication, and coordination between networks.
