Most if not all devices (looking at you Windows) do not use the secondary DNS at all, not even at failover, they take their due time to use the secondary one. Best practice would be to use a VIP as primary DNS that will load balance the requests to two DNS.

Poor mans Wi-Fi spectrum analyzer: Wi-Fi Man. Works with your phone.

Ubiquiti Building to Building, does not get easier than that. Works on 60GHz and will go to 5GHz during snow or rain. Max distance, about 500m.

1. No. you mean Wi-Fi 6E, which introduces 6GHz, which travels even less far than 5GHz does, so it would only be fast in the same room as the access point.
2. No idea what an AX value is.
3. No, directional systems only work with line of sight, you should not mesh Wi-Fi at all but always connect all access points via ethernet.
4. Use Unifi. Get two U6 access points (doesn’t matter which ones) and connect them via ethernet.

No budget. I’m willing to spend if needed.

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Then I would recommend to get all Unifi. A router, a switch and one, two or three access points.

The point of a 10G NIC is to be 10x faster than a 1G NIC. Most 10G NIC’s only work at 1G and 10G, they do not do the new 2.5G or 5G, for that you need a newer 10G NIC that will use these lower speeds which in terms makes no sense because you can just get a 2.5G or 5G NIC instead. You confuse your internet connection with your local network. Your local network can run at 10G while your internet runs perfectly fine at 1G, the other way around the same. If you have a 10G internet connection you need a 10G local network to actually make use of that 10G internet connection. If you have a 1G internet connection, the only reason to have a 10G local network, is because you have lots of data that you regularly move around, and you think 125MB/s is too slow. Other than that, there is no need for 10G in any home network.

Take a look at a Wi-Fi 6E cable here.

10GbE = 10 Gigabit Ethernet, regardless of what technology you use, be it 10GBASE-T or SFP+.

Test with iperf2, not 3, 2 uses multi cores, 3 doesn’t. SFP+ is always preferred over 10GBASE-T for using less power and getting less hot, and the added benefit that SFP+ supports everything.

Do you see much interference and connection retries on the 2.4GHz spectrum in your Unifi controller?

Unifi. Just works, does everything you need. Simple UI, lots of different hardware.

No. A PoE injector will simply ignore any PoE coming in on the data port. Why not use a PoE powered switch like the Unifi Flex? I used several of these to power multiple cameras where I only ran one PoE cable to.

100% agreed, yet, pointing out all options available is a nice thing to do.

Do you need a cable or is a good Wi-Fi connection enough? You have three options, since 26m is not very far.

1. Run fiber. You can use so called media converted to convert from ethernet (copper) to fiber, you need them on both ends, they both need power.
2. Run an ethernet cable. Since it runs outside, make sure you use a S/FTP cable that is properly grounded on both ends and use ethernet surge protectors to prevent your gear from being fried by lightning.
3. Install a directional Wi-Fi access point on the outside of your house pointing in the direction of your garden office.

No. In all cases all devices have maximum speed of your network equipment and themselves. I think what you meant to ask if a switch would reduce the bandwidth available to the devices, which is also a no. Both PC’s using the internet at the same time will reduce the bandwidth, but not 50:50. A normal unconfigured router will give 100% of the bandwidth to each connection, meaning, if PC A is downloading a 1GB file that takes 10’ to download, the internet for all other devices for the next 10’ would appear to be very slow, till that download is finished. A more advanced router, would reduce the bandwidth of PC A to like 70% so that 30% can be used by PC B. In any case, the network equipment you use, as long as it is faster or the same speed as your internet connection, and not connected by dozens of switches, will not slow down your internet. Multiple clients do. I have a network of over 250 clients at home, so there are rules in place to guarantee the bandwidth needed for certain devices (like TV’s for streaming) where as other devices (like phones or tablets) are less prioritized.

You put switch thingy in there, connect all ports to switch thingy. You connect modem LAN port to any room port (so it connects to switch thingy), and connect modem to WAN via VDSL in room where VDSL available. Dumbed down enough for you?

Alter, kauf dir ein Switch, steck alles dort ein, pack dein Modem dort hin wo du das Internet bekommst (VDSL: Telefonsteckdose, Kabel: Coax), verbinde den LAN port von deinem Modem und voilà jeder Raum hat Internet.

Over what distance? What bandwidth?

Use NVMe as cache and the 10G will be 100% used.

Are you happy with your current speed? Did you check how much more you would pay for the 60 or 200 option?

Becaue crappy mesh Wi-Fi will cut your bandwidth in half and add a lot of latency where as a crappy wired access point will just no seerve many clients at the same time.

I will and would never use Wi-Fi mesh. All access points always wired (they need PoE anyway) for best throughput and lowest latency (8ms to 8.8.8.8) possible. Wi-Fi mesh is pure marketing.