Is this a router and switch? Or just a switch.

It is a layer 3 switch. A L3 switch is a switch with routing features, so his performance as a switch is equal or better than a layer 2 switch with similar features; the difference is in the routing performance: his performance is a bit lower than a pure router (with the same features). This is because the main motherboard hardware of the L3 switches is built to be a high performance switch. The main motherboard hardware of the routers is built to execute routing tasks, so a router is better than a L3 switch in these tasks. To compare their routing software performance, just see their software routing features (L3 protocols, etc). The performance of a router is mainly measured by his routing hardware capacity, not by his routing software features because the software features are added just buying/installing/enabling a software license and/or changing the NOS (Network Operating System). You can compare their routing hardware performance (between a L3 switch and a Router), looking for the packet throughput (measured in pps (packets per second)) and the total BW throughput (in Gbps ) in each brochure/datasheet . The CRS312-4C+8XG-RM has a packet throughput of 178 Mpps (is called forwarding rate) and a BW throughput of 120 Gbps . The switching performance is measured by the switching throughput also called switching capacity, 240 Gbps for the CRS312-4C+8XG-RM => it is good as router and very good as high speed switch. L3 Switches are good " cheap" solution for small enterprises or SOHO networks, because they replace the router and switch functions, all in one box. If you really need more performance, then you go for a separate real router and a high speed L2 or L3 switch.

Does this have the typical loud/jet engine fans in it?

The fans do "ramp up" when passing packets and it is noticeable.

Can this support vlans between 1 - 4094 like with cisco?

Yes, and lots of info online how to do this. Configuration can be complicated and I've not sorted it yet - but this is my operational setup so have to be cautious. Watch YouTube, buy routers by example and be careful

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⚡ Power your data-driven empire with unstoppable 10G speed!

BLAZING 10 G SPEEDS - 12 ultra-fast 10G ports to crush data bottlenecks
UNINTERRUPTED POWER - Dual power supplies ensure zero downtime for mission-critical tasks
FLEXIBLE CONNECTIVITY - 4 combo ports switch seamlessly between RJ45 and SFP+ fiber
SMART PORT MANAGEMENT - RouterOS scripting lets you customize port activation on the fly
FUTURE PROOF YOUR NETWORK - Designed for multimedia pros, researchers, and devs handling massive data

The Mikrotik CRS312-4C+8XG-RM is a 12-port 10G switch featuring 8 fixed RJ45 10G ports and 4 combo ports that support either 10G RJ45 or 10G SFP+ fiber connections. Equipped with dual redundant power supplies and advanced RouterOS scripting capabilities, it delivers reliable, high-speed connectivity ideal for demanding environments like multimedia production, scientific research, and big data analysis.

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Data Transfer Rate	12 Gigabits Per Second
Upper Temperature Rating	7E+1 Degrees Celsius
Interface	RJ45
Voltage	220
Number of Ports	12
Compatible Devices	Desktop
Switch Type	Ethernet switch
Item Weight	2.3 Kilograms
Case Material Type	Metal
Color	dark gray" or "black

MikroTik 12-Port 10G Switch with Dual Power Supply (CRS312-4C+8XG-RM)

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