Which of the following characteristics is not shared by IS-IS and OSPF?

a. Use the Dijkstra algorithm.
b. Classless protocols.
c. Use Hello packets.
d. The backbone can be segmented.


d. The backbone can be segmented.
Explanation: Both protocols use the link state protocol with the Dijkstra algorithm. Both are classless protocols, which enable the support of a variable length subnet mask. Both protocols use Hello packets to form and maintain adjacencies. In OSPF, all area 0 routers must be connected, but IS-IS L2 routers do not need to be connected.

Computer Science & Information Technology

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