COMP247 Lecture Notes - Lecture 10: Network Interface Device, Cable Modem, Icann
19 Sep 2018
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Must use tcp/ip, it was made for the internet, basically the language of the internet. No (cid:862)desig(cid:374)e(cid:396)(cid:863) fo(cid:396) the i(cid:374)te(cid:396)(cid:374)et, it"s just a (cid:271)u(cid:374)(cid:272)h of people ag(cid:396)eei(cid:374)g to thi(cid:374)ks a(cid:374)d working together. Set up as local, regional and national (connecting countries together, basically) isps. Some isps connect to multiple larger isps for redundancy to keep everything running properly. There is an isp hierarchy: some focus on linking across national boundaries, some focus on linking restricted geographic areas (national or smaller, others focus on internet access for homes and businesses. National (tier 1): sell access to regional and local isps. Regional (tier 2): connect with national isps and provide and sell access to local isps. Autonomous system: a collection of ip routing prefixes. Local (tier 3): connected to national or regional isps and sells access to individuals: single routing policy (bgp) to rest of the internet, can be single organisation or isp with clients.
