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Netwok Host Names in DNS secure or not?

What is the best practive for putting switches, routers and other network devices into DNS?

It helps for traceroute and connecting to your devices but does it give away too much information?
Watch Question

Having the hostname of you network devices really doesn't give away that much information. Anyone can find your switch/router with a quick port scan of your network, the hostname will not aid them in breaking in. There are some that would argue against having the physical location in the hostname since it advertises "where" in the network they are, the counter argument is that they shouldn't have gotten into your network in the first place.