Internet consists of more than one networks that are interconnected through at least a backbone. IXP - Internet Exchange Point: physical infrastructure through which Internet service providers (ISPs) exchange Internet traffic between their networks
AS: is one network or sets of networks under a single administrative control. An autonomous system might be the set of all computer networks owned by a company, or a college. Companies and organizations might own more than one autonomous system, but the idea is that each autonomous system is managed independently
An example of a local ISP Note the CSU/ DSU. Discussion in later slide.
CSU: T1 and LAN uses different electrical voltage for signals. CSU standardizes it. DSU: For formatting of data from LAN to WAN (T1).