A node is something that his installer provided, and should have been connected the proper way. The signal coming from the dish must connect to your node, since you have 2 cables it is likely a solo node. There should be no splitters or other signal flow devices between the dish and the node. Then from the Host port of the node should go either directly to the hopper, or to a tap/isolator if your installer needed to use one. At no point is there a module or splitter that allows you to move the hopper around to multiple rooms depending your mood. The joeys, however, operate in the UHF band and can/must be connected to the node using a regular CATV splitter if you have more than 1. You could use a 6 or 8 way splitter to connect those extra rooms and they would be "ready" for a joey in the sense that you could move a joey from room to room. If you want the equivalent of a networking switch you're SOL. On the other hand, Directv's SWM technology works exactly how you described using special high frequency Directv splitters.
I find it not surprising, even intentional, that dish produced a wiring diagram (from FlyingDiver's post before mine) that makes the hopper seem simpler than VIP series receivers. I much prefer the hopper to old receivers but the first wiring diagram has a lot of unnecessary junk included that they left out of the hopper diagram. They make it seem like old receivers need a 1000+ dish, 4 cables, and a DPP44 switch. The entire left side of the first wiring diagram on any modern install is identical to the hopper diagram all the way from the dish to the ground block so forget all that mess with the 44 switch. Then they include the sling link turbo for an internet connection which I haven't used in years because all you need is a usb wifi adapter plugged into the back of the receiver. But they're specifically going for clutter, so why not also show romex on the diagram too!? They even show the power cords from the tv... Then you look at the hopper diagram and it's nice and tidy and clearly that's purposeful. Both Dish and Directv are a bunch of confidence tricksters through and through. A distant friend of mine was telling me about a job offer as a subcontractor with dish and he was going over the details and they outright lied to him on several important points. I warned him of what to watch out for but sometimes you can't tell an eager, determined person what they don't want to hear. /rant