What is an Autonomous System in EIGRP  ? 

In the context of computer networking, an Autonomous System (AS) refers to a collection of IP networks and routers under the control of a single organization or entity that presents a common routing policy to the internet. An AS is assigned a globally unique identification number called an Autonomous System Number (ASN).

EIGRP, which stands for Enhanced Interior Gateway Routing Protocol, is a routing protocol developed by Cisco for use within an organization's internal network. EIGRP is a distance vector routing protocol with some advanced features that make it more efficient and adaptable to changing network conditions.

In the context of EIGRP, an Autonomous System (AS) refers to the portion of the network that is running EIGRP and operates under a single administrative domain. The routers within the same EIGRP AS share routing information and use EIGRP's algorithms to calculate optimal paths for data packets within that AS. EIGRP supports classless routing, which allows for more efficient use of IP address space and better network scalability.

EIGRP's concept of an AS is similar to other routing protocols like OSPF and BGP, where an AS represents a logical grouping of routers and networks that follow a specific routing policy. However, EIGRP is typically used within a single AS, unlike BGP, which is often used to connect different ASes (autonomous systems) on the internet.

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