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When you bring up an AppleTalk router on the network, it is initialized with its own zones and network numbers. It then begins to exchange routing information packets with every adjacent router on the internetwork.
When other routers receive routing information packets informing them of a new network on the internetwork, those routers send a query to the router that represents the new network. The query asks for the zone name or zones list associated with it. The new router responds to this query with its zone information. Eventually, all routers on the internetwork have an updated global list of all zones and networks on the entire internetwork. This global list enables all users on the internetwork to see services in all AppleTalk zones.
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