Operation Hello and Dead interval. How they behave in different types of networks and their influence on the formation of adjacencies.

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"Hello" packets are used to discover neighbors and maintain adjacencies.

The "Hello" and "Dead" intervals must be equal for all the neighbors connected to a medium.

The default values used for the "Hello" and "Dead" interval depend directly on the interface type.

When the "dead interval" is met, the adjacency is terminated.

The "dead interval" is defined as 4 times the hello timer.

If we want to use "compatible" network types, we must ensure that the timers match

Network types and its timers:
Non-Broadcast - 30/120
Broadcast - 10/40
Point-to-point - 10/40
Point-to-multipoint - 30/120



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