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Explanation/Reference: Explanation: IS-IS hello PDUs establish adjacencies with other routers and have three different formats: one for point- to-point hello packets, one for Level 1 broadcast links, and one for Level 2 broadcast links. Level 1 routers must share the same area address to form an adjacency, while Level 2 routers do not have this limitation. Reference: http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/is-is-routing-overview.html