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I've heard the use of serial interfaces of router is not so common in the current network environment. But in some exams like CCNA, you can still see questions including the knowledge of serial interface. So, I don't know if it is true or not that using serial interfaces is not common.

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    Not common does not mean "non-existent". Almost everything is ethernet these days, but you'll still run across the rare T1, T3, and OC-x (as well as DOCSIS cable, xDSL, and cellular) interfaces. P-t-p microwave still exists, but it was always rare. – Ricky Beam Jun 20 '19 at 1:23
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can provide and accept your own answer. – Ron Maupin Dec 15 '19 at 4:22
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As Ricky Beam has already written, even though Serial connections might not be common where you live, that doesn't mean they don't exist.

Over 90% of the connections we have in Europe use either Ethernet or xDSL. But in countries like Philippines, Nigeria and Cameroon, we have a lot of Serial connections.

In the end i guess it depends a lot upon where you are and what is available, that is also why Cisco have not ruled this type of connection out of their certifications. I do not know of any database specifying the most used connections based on which country you are located.

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Serial interfaces are commonly used in my work as a Field Engineer. What you've heard is a misconception.

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