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  • Good answer. The only thing I would add is that there is probably just some factor of the preference of the people who developed the original implementation and then historical inertia that kept it that way until someone decided to do things differently with more recent implementations. It boils down to how it was done first and then how people didn't want to change it because they are used to doing it that way. Commented Apr 28, 2023 at 14:01
  • @Marc'netztier'Luethi Thanks, but I am not sure this addresses my question precisely. I know the benefit of the wildcard mask. But what is the difference if it is not configured? see the updated question. can we even ignore it in ospf as I am sure we can do in eigrp?
    – Shadi
    Commented May 1, 2023 at 18:19
  • I am sure we can do in eigrp? Can you please provide an example/source for that? Commented May 1, 2023 at 18:34
  • @Marc'netztier'Luethi This is A Packet Tracer EIRGP Lab that was created without using wildcard masks.
    – Shadi
    Commented May 2, 2023 at 5:29
  • @Shadi i don't have (nor want to run) packet tracer; can you please edit the question to include your source? Add quoted text if at all possible, screenshots only if there's no alternative. Other than tha: network statements without an explicit wildcard mask will implicitely use the classful mask matching the address class. Once more, the demon of classful adressing comes to haunt us.... Commented May 2, 2023 at 6:59