Nas connected to both iMac and network-switch via different ethernet cable

Nas connected to both iMac and network-switch via different ethernet cable

Message Body:
I would like to know whether I can connect my (to be purchased) Synology NAS to my (to be purchased) iMac (with to be purchased 10GBe-thunderbolt dongle) via a 10GBe cable CAT6a (for photo/4K video editing) AND at the same time connect this NAS to my 1G-switch (48 ports) so that the (other) information on the NAS is accessible for all other devices in the network (wired via Cat 6a or wireless).

Is this possible (without an expensive 48 port 10GBe-switch)?
Or should I combine a small 8-port-10GBe switch (for the 10GBe NAS and iMac) with my current 1GB-switch (a little bit less expensive)?

Do I need another NAS manufacturer for my to be purchased NAS?
As I already have one 2-bay Synology NAS my preferences is to stick with this brand (I’m considering DS1820+, hopefully it has 10GBe on board), but switching is certainly an option (LOCKERSTOR 10 (AS6510T) e.g.), but that had some performance issues to live up the 10GBe expectations.

Does a Synology NAS with 10GBe add in card have the same performance issues?
What metrics should I care for (specific CPU and amount of RAM)?
Which specific NAS (series) to look for?

Do I need special other equipment or software?
Or is there a completely different solution I’m not aware of?

Thanks in advance for diving into this question, if something is unclear, please ask as this new setup will be part of my life for 10 years or so. Thus, I want to make the best decision now or later this year so that the network does not need another investment the coming years.

Your plan sounds good. Yes you can have DS1819+ with 10GbE card connected to your MAC via adapter. Direct connection will require setting manual IP on both ends, but save money on switch. Or you can get a cheap dual 10G + 1Gbit port switch to keep things simple.
Here is cheapest ones : https://nascompares.com/2018/01/19/cheapest-10gbe-switches/
You can mix this switch with other switches. You can also connect via 10g and 1Gbit simultaneously. Each port is treated as separate connection.

I hope this helps.

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