| http://www.w3.org/ns/prov#value | - IS-IS has two hierarchical levels (L1 and L2) and two network types (Point-to-Point and Broadcast) so it???s essential to have different types of hello messages or PDUs for serve these networks since the data-link layer for broadcast and P2P links have different style of addressing so they need different treatment, due to this differences there are three IIH PDUs and they are identified in the IS-
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