Reddit reviews Cisco Small Business 200 Series SLM2048T-NA Smart SG200-50 Gigabit Switch 48 10/100/1000 Ports, Gigabit Ethernet Smart Switch, 2 Combo Mini-GBIC Ports (Renewed)
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This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.comGet the high availability and performance you need to support vital business applications while reducing downtime.Advanced Features: Control network traffic with advanced features such as quality of service (QoS), Layer 3 static routing and IPv6 support.Intuitive browser-based tools, mass deployment capabilities, and consistent features across all models simplify setup and configuration.Switches optimize power usage for energy efficiency without compromising performance.
So there is not a simple end all be all solution this problem, unfortunately.
But a good place to start would be upgrading your 2 devices initially. I am assuming you have Cisco small business router and not 2 home routers.
The home routers looks something like this - https://www.amazon.com/TP-Link-AC1750-Smart-WiFi-Router/dp/B079JD7F7G/ref=sr_1_1_sspa?keywords=router&qid=1557460874&s=gateway&sr=8-1-spons&psc=1
Cisco small business routers like this - https://www.amazon.com/Cisco-Systems-Gigabit-Router-RV325K9NA/dp/B00HODK3N0/ref=sr_1_1?crid=1WUJF97665J0D&keywords=cisco+small+business+router&qid=1557460910&s=gateway&sprefix=cisco+small%2Caps%2C166&sr=8-1
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I would invest in something like the Cisco router I linked if you don't have it already. Fortunately, the Cisco router I linked is ready out of the box and can work on day 1. I would still confirm that with Cisco support as I only learned that from the Q and A page on Amazon. Having a router ready out of the box IS NOT THE NORM, and you generally need someone who knows how to configure them come in, usually a contractor of some sort. Alternatively, most home routers will support 255 devices, and that being said, and good Asus/Belkin/Netgear 150$ - 300$ router would likely be good enough for only 30 people.
Secondly - I don't know why you would need 2 routers. Routers enable a network to connect to the internet and to other networks. Having 2 seems unnecessary unless we are missing something. You can set up 1 router where your network meets the internet and have that second router be turned into a dedicated switch.
Cisco Switch (THIS IS NEEDS TO BE SET UP BY SOMEONE WHO KNOWS HOW TO MAINTAIN/CONFIGURE CISCO DEVICES) - https://www.amazon.com/Cisco-SLM2048T-NA-Mini-GBIC-Certified-Refurbished/dp/B07HFKMR2B/ref=sr_1_1_sspa?keywords=cisco+small+business+switch&qid=1557461367&s=gateway&sr=8-1-spons&psc=1
Or - https://www.amazon.com/SYSTEMS-10-Port-Gigabit-Managed-SG35010K9NA/dp/B01HYA36SG/ref=mp_s_a_1_4?keywords=cisco+small+business+switch&qid=1557464529&s=gateway&sr=8-4
Unmanaged Switch (Commonly used at homes, Ready out of the box) - https://www.amazon.com/NETGEAR-16-Port-Gigabit-Ethernet-Unmanaged/dp/B01AX8XHRQ/ref=sxin_3_ac_d_pm?keywords=network+switch&pd_rd_i=B01AX8XHRQ&pd_rd_r=5575aed3-5184-474d-83c5-aca41f5c556a&pd_rd_w=K09zH&pd_rd_wg=uxzTY&pf_rd_p=5cc8abfe-8f78-4f34-b19f-d09d6ea0dca4&pf_rd_r=3F3DJSBGZNTDJQK0H8GG&qid=1557461743&s=gateway
*none of these switches will really impact performance, it's more along the lines of available ports and scalability.
From your second device (the switch), you should then be able to hardwire a few accesses points. The access points will broadcast the Wi-Fi signal covering generally about 1400 - 7000 FT depending on quality.
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Cisco Access Point - https://www.amazon.com/SYSTEMS-802-11ac-Wireless-Access-WAP371AK9/dp/B00L0LIM62?ref_=fsclp_pl_dp_1
This AP claims that it is also plug and play. Again plug and play is great, but still, expect some troubleshooting if things don't work initially out of the box. It's always best to do research and consult a local IT person/department. Having a few of these AP's would provide some pretty solid Wi-Fi for the area as long as the ethernet cable is properly insulated and outside ethernet (CAT-6) cable is used where it needs to be used. Remember ethernet will have problems if it is exposed to the elements or if it exceeds 300 FT.
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There is still so much more to consider and I'm really not that smart. Just your average IT guy trying to be helpful. Iv done this sort of things to an extent for a few years. Let me know if you have more questions.