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Unlike OSPF, IS-IS doesn't support VLSM. True or false?
True
False
Comparison with OSPF Both IS-IS and Open Shortest Path First (OSPF) are link state protocols, and both use the same Dijkstra algorithm for computing the best path through the network. As a result, they are conceptually similar. Both support variable length subnet masks, can use multicast to discover neighboring routers using hello packets, and can support authentication of routing updates.
https://en.wikipedia.org/wiki/IS-IS
--------------------this is the former explanation ----------------------- no where below says it does not support VLSM
On the Surface, the IS-IS and OSPF have some features in Common: a. They both maintain Link State Database From which the SPF algorithm computes the shortest path tree.
b. The Hello packets to form and maintain adjacencies.
c. Both use areas to form a two-level hierarchical topology.
d. Both have capability of providing address summarization between the areas.
e. They both are classless protocols.
f. Both have Authentication capabilities.
lastly : GOSIP:
GOSIP: Governments Open System Interconnection Profile:
AFIU--->ICDU--->DFIU--->AAIU--->ReservedU--->RDIU--->Area System IDU--->SEL
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