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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Description

🚀 Power your network like a pro — speed, reliability, and control in one sleek switch!

BLAZING 10 G SPEEDS - Upgrade from 1G bottlenecks to ultra-fast 10G RJ45 and SFP+ combo ports for seamless high-bandwidth workflows.
UNSTOPPABLE UPTIME - Dual power supplies ensure zero downtime, keeping your critical projects on track even under pressure.
RACK READY ROBUST - Sleek 1U metal chassis fits standard racks, built to handle professional-grade data loads with ease.
FLEXIBLE CONNECTIVITY - 8 dedicated 10G RJ45 ports plus 4 software-selectable combo ports for ultimate network customization.
SMART NETWORK CONTROL - Powered by RouterOS for advanced scripting and Layer 3 features, giving you full command over your network.

The MikroTik CRS312-4C+8XG-RM is a professional-grade 12-port 10G switch featuring 8 dedicated 10G RJ45 ports and 4 combo ports that support either 10G RJ45 or 10G SFP+. With a total non-blocking throughput of 120 Gbps, switching capacity of 240 Gbps, and forwarding rate of 178 Mpps, it delivers exceptional performance for data-intensive tasks. Dual redundant power supplies guarantee continuous operation, while RouterOS offers advanced network management and scripting capabilities. Housed in a 1U rackmount metal case, this switch is designed for demanding environments like multimedia production, scientific research, and big data analysis.

Specifications

Product Dimensions	44.3L x 18.3W x 4.4H Centimeters
Item Weight	2.3 Kilograms
Voltage	220
Case Material Type	Metal
Upper Temperature Rating	7E+1 Degrees Celsius
Interface Type	RJ45, SFP+
Data Transfer Rate	12 Gigabits Per Second
Current Rating	1 Amps
EU Spare Part Availability Duration	2 Years
Manufacturer	MikroTik
UPC	600168150205
Model number	CRS312-4C8XG-RM
Number of Memory Sticks	1
Specific Product Use	personal
Item Weight	2 kg 300 g
Batteries	1 Lithium Ion batteries required.
Item model number	CRS312-4C8XG-RM
Auto Focus Included	No
Wattage	60 Watts
Are batteries included?	No
Lithium battery energy content	2 Kilowatt Hours
Lithium Battery Packaging	Batteries packed with equipment
Lithium battery weight	2 Grams
Number of lithium ion cells	5
Number of lithium metal cells	5

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