I'm wondering because we're moving our rack to a co-location but we have LOTS of space behind our rack so I mount our switches on the backside for easier cabling. But i've seen a lot of pictures where the switches are mounted on the front. Is this because access from the back of the rack is mostly limited in datacenters? Sounds like a PITA.
Full access to the rack is of course a must in order to put devices in and properly cable them, but the standard setup is to have switches mounted on the front for easier inspection and patching; having to go around the cabinet, open it and look inside only to see if a switch light is blinking is a lot more troublesome than glancing at it from the front, even if you have full access from every direction.
With proper internal cabling, a switch on the front is no pain at all.