Answer Posted / anonymous
AS: Autonomous system, this is a collection of routers
(links) that belong to a single administrative domain, used
by EIGRP to communicate between devices, also you can break
a single EIGRP AS, Ex: AS10 for policy based routing,
effectively changing the dist metric from 90 Ext to 170 Int
BGP also uses AS to break admin domains for routing.
Area is used in OSPF SPF algorithm, this area, either ABR,
or ASBR router will flood Link state advertisements ( Type
1,2,3,5,7) which gives a topoloigical view of the network.
OSPF uses different area types, stub NSSA,Totally stubby
area (Area-No Stummary) to filter LSA's.
You need all areas (routers links in those areas) to be
contigous to Area0 (Backbone area).
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