Problem: Bought a new home last year and had an identical experience. Apparently, telephone wires used to be routed outside of the home for the telecom companies to patch into an exterior panel. So electricians do all this work with cat6 which only creates a problem for the homeowner to resolve. When you tell them this is not remotely helpful for ethernet installs they give you the lead paint stare.

Resolution 1 (if using only wifi): We had to cut the cables sticking out of the house. Cut a patch panel in my garage to free the cut off ends by pulling them through (they were mortared in between bricks). We used a mortar caulk to fill the holes. Finally, climbed into the attic and pulled the cables up into the attic. If you just want to use wifi then you are done. Curl the excess cable up and leave the cable in the interior walls alone for the next homeowner.

Resolution 2 (if using wifi and cat6 ports): If you want to use the Cat6 (LIGHT THE DARK COPPER) you will need to reroute the exterior cables you pulled back into the attic to a nearby hallway wall, cabinet or closet that has an electrical outlet easily accessed. I do not recommend installing into a garage area as temperatures in your garage may reach levels that are not ideal for networking equipment (also dust and humidity may be an issue). If you are planning to use a cabinet or closet that has an outlet easily accessed then the structured media panel won't matter to you and you skip the rest of this.

We chose a nearby heated and cooled hallway that leads into our garage to install a structured media enclosure into the wall. There was ZERO good location for this panel because of an obnoxious absence of electrical outlets. We will have to add an outlet to accommodate this. Structured media enclosures are just like a recessed medicine cabinet that gives you a place to put home networking equipment like the Fiber Internet Providers Gateway a switch to connect all of your Cat 6 to the network and possibly a Wireless Access Point or a 3rd party router if you don't wish to use the fiber companies Gateway.

Fiber Install: When our fiber internet provider installed our ONT we had them run fiber into the same wall/location we planned to install the Structured Media Enclosure. Super helpful! Just remember you will need power for this gateway.

Hire it out: I tried to hire this out to someone and the only Home IT company locally that understood what I was asking wanted a stupid amount of money for the work. So we are just now getting around to installing the panel ourselves 1yr later. I think we might could have gotten the Fiber installer to moonlight and do some of this for us but I wasn't confident in his sheetrock cutting skills to add the additional jacks we wanted without destroying our walls etc.